60 results about "Regenerative amplification" patented technology

The invention discloses a laser capable of simultaneously outputting nanosecond pulses and pico-second pulses. The laser comprises a signal source, a signal isolation system and an amplifier. According to the invention, with an electric light control technology of combining an extra-cavity Pockels cell and intra-cavity Pockels cell, a regenerative amplification process is realized in case of signal light importing so as to obtain high-energy pico-second laser output, and cavity empty process is also realized in case of no signal light importing so as to obtain nanosecond pulse output; and thefree combination of the two processes can be realized according to practical application demand, and as a result, free combination of numbers of the nanosecond pulses and the pico-second pulses in a single laser is realized and is output in an alternative way. The laser provided by the invention has an important application in high-precision high-efficiency fine processing field, as well as basicresearch fields such as plasma excitation, excited state control, chemical reaction control, special radiation excitation and the like.

Provided is a high-repetition-rate femtosecond regenerative amplification system. The regenerative amplification system includes: a laser oscillator emitting pulses; a stretcher stretching the pulses with negative dispersion; a regenerative amplifier amplifying the pulses, the regenerative amplifier comprising an acousto-optic modulator for pulse switching, a pulsed pump laser for pumping a gain medium, a resonator for reciprocating the pulses between a plurality of mirrors, and at least one chirped mirror for providing negative dispersion; and a glass compressor compressing the pulses. Accordingly, the 100 kHz-class high-repetition-rate femtosecond regenerative amplification system can produce an output energy of tens of μJ, higher than a few μJ provided by a conventional system.

An optical receiver includes: a converting unit that converts an optical signal into an electrical signal; an amplifying unit that amplifies the electrical signal; a regenerating unit that regenerates the amplified electrical signal; a correcting unit that performs correction of an error included in the regenerated electrical signal; a monitoring unit that performs monitoring of an optical current flowing through the converting unit; and a control unit that calculates a decision threshold based on a result of the correction and a result of the monitoring.

The invention discloses a random waveform weak signal detection method and system under the low signal to noise ratio. The system comprises a low noise amplifier, a phase-locked loop, a microprocessor, a digital frequency synthesizer and an operation module, wherein the frequency of a weak signal to be detected is locked by simulating the work of the phase-locked loop, the microprocessor is utilized to measure the output frequency of the phase-locked loop, a direct digital synthesis circuit is controlled to produce a common-frequency signal according to a frequency value, and the common-frequency signal serve as a reference signal required by relevant detection. The operation module adopts a multiplier and an integrating circuit to achieve relevant detection, enables a mutual correlation value to be maximum by adjusting the phase of the reference signal in a stepped mode, obtains a regeneration signal identical to the detected signal in frenquency and phase and accordingly achieves weak signal detection and amplification. Under the low signal to noise ratio condition, the random waveform weak signal detection method and system has good linear measurement characteristic and high accuracy and can achieve automatic detection and regeneration amplification of the random waveform weak signal.

To solve the problems that OEO (Online Editing Object) repeaters in the prior art only perform unidirectional work, or cannot adapt to GPON (Gigabit-Capable PON) / EPON (Ethernet Passive Optical Network) utilization requirements due to completion of regenerative amplification of downlink continuous optical signals or completion of regenerative amplification of uplink sudden optical signals, the invention provides a bidirectional working optical-electrical-optical repeater which comprises two optical wavelength division multiplexers, two photoelectric receivers and two electro-optical transmitters; the optical wavelength division multiplexer 1 is connected with an optical network unit OLT (Optical Line Terminal) optical interface, the photoelectric receiver 1 and the electro-optical transmitter 2; and the optical wavelength division multiplexer 2 is connected with the OLT ONU (Optical Network Unit) optical interface, the photoelectric receiver 1 and the electro-optical transmitter 2. The bidirectional working optical-electrical-optical repeater provided by the invention has the advantages that the regenerative amplification of downlink continuous 2.5 Gbps optical signals and uplink sudden 1.25Gbps optical signals can be finished simultaneously; optical performance and electrical performance satisfy GPON / EPON optical network standards; and the bidirectional working optical-electrical-optical repeater can be widely applied to GPON / EPON optical networks.

The invention is a table-type all-solidified high-repeated frequency fly-second laser device, comprising fly-second pulse oscillator, pulse widening device, regenerative amplifier and pulse compressor, and its character: the pulse widening device is composed of grating, convex lens and concave reflector; the regenerative amplifier is composed of polarizing plate, Pockels cell, highly reflecting concave mirror, Ti-sapphire stick and reflector group; the pumping source of the regenerative amplifier is a Q-switch plane waveguide laser; the pulse width compressor is composed of reflector, two parallel-placed gratings and all reflector. Its output power can be up to 20W, higher 31 times than that of preceding technique, able to be applied to generate super ultraviolet or X rays, and has an extremely wide application prospect in photoetching, optical communication and micro-fabricating technique.

The invention discloses a regenerative laser amplifier based on a slab gain medium. The regenerative laser amplifier comprises a seed light source (1), a light beam coupling module (15), a light isolation module, a regenerative resonator and a pump module. The regenerative resonator comprises the slab gain medium (11). Two end surfaces of the slab gain medium (11) are polished and are used for penetration of pump light and laser. The upper large surface and the lower large surface of the slab gain medium are connected with a cooling device, thereby realizing effective cooling. Because the slab gain medium has relatively large pump volume and relatively large heat radiation area, heat can be distributed on the whole slab gain medium (11) and furthermore high-efficiency cooling through the two large surfaces is realized, thereby realizing relatively low integral heat effect influence. Furthermore the relatively large cross section can bear higher laser pulse peak power. Therefore the regenerative laser amplifier based on the slab gain medium can realize output of amplified regenerative laser with high average power and high light beam quality.

There is provided an optical regenerative amplifier for regenerative amplification of a binary phase shift-keying (BPSK) sequence of optical signals having a predetermined time slot between any adjacent signals. The optical regenerative amplifier comprises a first delay interferometer, wherein an input sequence of BPSK signals is split between two arms of an interferometer, a relative delay by the time slot between the adjacent signals is introduced in one of the arms of the interferometer to produce two mutually anti-symmetric trains of amplitude shift-keying (ASK) signals; a discriminative limiting amplifier to amplify the said two trains of anti-symmetric ASK signals, wherein the amplification for the spaces is smaller compared to the amplification for the marks and the amplification for the marks is limiting; and a second delay interferometer, wherein the said two trains of anti-symmetric ASK signals are recombined, delayed, and interfered to reproduce a regeneratively amplified BPSK sequence of signals and to separate noise from the signals.

The invention discloses a linear-cavity optical fiber regenerative amplifier, and relates to a laser. Doped fibers are adopted to replace a working substance of the traditional linear-cavity regenerative amplifier, such as laser crystals or glass; and a control circuit can regeneratively amplify signal-pulses with different energies and different wavelengths to acquire the maximum output power automatically, and the manual control of a second pockels cell is not needed any more. In the linear-cavity optical fiber regenerative amplifier, signal light passes through the working substance for multiple times, so the pump light is fully utilized and the pumping efficiency is improved. The linear-cavity optical fiber regenerative amplifier is suitable for obtaining high power or energy polarization pulse light output by passing light pulses through various doped optical fibers.

The invention provides a regenerative amplification system used for the laser amplification. The amplification system comprises a spot shaping part, a two-way import and export part and a cyclic amplification part which are connected successively. The spot shaping part is used for shaping a near field of a light beam into a desired shape. The two-way import and export part is used for injecting the light beam into the cyclic amplification part, and realizing the separation of the output light beam and input light beam from the cyclic amplification part. The cyclic amplification part is used for transmitting and amplifying the shaped light beam in a shape-preserving mode repeatedly and arbitrarily. The regenerative amplification system has the advantages of realizing the repeated and arbitrary amplification of the shaped light beam in a conformal mode and realizing the high-gain amplification and great power export and applying to a complicated laser device at the same time on the basis of a gain amplifier with a low large caliber, and simplifying a device structure greatly.

Provided is a high-repetition-rate femtosecond regenerative amplification system. The regenerative amplification system includes: a laser oscillator emitting pulses; a stretcher stretching the pulses with negative dispersion; a regenerative amplifier amplifying the pulses, the regenerative amplifier comprising an acousto-optic modulator for pulse switching, a pulsed pump laser for pumping a gain medium, a resonator for reciprocating the pulses between a plurality of mirrors, and at least one chirped mirror for providing negative dispersion; and a glass compressor compressing the pulses. Accordingly, the 100 kHz-class high-repetition-rate femtosecond regenerative amplification system can produce an output energy of tens of μJ, higher than a few μJ provided by a conventional system.

The invention discloses a regenerative amplifier device with adjustable pulse energy and time intervals, and a method for generating controllable pulses by using the regenerative amplifier device. An electro-optical Q-switch driving source is controlled through controlling a synchronous trigger, so that voltage at two ends of an electro-optical Q-switch is changed and switching of one energy storage stage and a pulse amplification stage is completed; and arbitrary control on the time intervals and the energy of the pulses in a pulse train is achieved through controlling the turn-on or turn-off time length of the electro-optical Q-switch and the time intervals of the pulse amplification stage and the next energy storage stage.

The invention provides an optical communication system (10) comprising a plurality of mutually interconnected bi-directional optical waveguide rings (20, 30, 40, 50, 60) in which radiation modulated with communication traffic propagates. The radiation is partitioned into 32 distinct wavebands. Interfaces (70, 80, 90, 100, 110, 120) are included in the system (10) where communication traffic propagating in the rings transfers from one ring to another. Each interface (70) is capable of providing an all-optical waveband reconfigurable communication link between the rings (20, 30, 40, 50, 60). At each interface (70), conversion of optical radiation to corresponding electrical signals is not required when transferring communication traffic from one ring to another, thereby providing the system (10) with a potentially larger communication bandwidth compared to conventional optical communication systems. If required, the interfaces (70, 80, 90, 100, 110, 120) can include one or more of regenerative amplification (440, 850, 852, 854, 856, 858, 860, 862, 864) and wavelength-switching transponders (1332, 1410).

A fiber laser arrangement with regenerative pulse amplification, having a femtosecond fiber oscillator as a pulse-generating unit, a fiber amplifier designed both as a pulse-amplifying and pulse-stretching device to amplify and to stretch the femtosecond pulses generated by the femtosecond fiber oscillator, a regenerative amplifier, which has a disk-shaped laser crystal as a gain medium, and which is designed to produce additional pulse stretching during the regenerative amplification, and a pulse compression device, which temporally compresses the amplified and time-stretched pulses.

The invention provides a method for acquiring full solid state ultrashort laser pulse with high repetition frequency (1-500kHz), high pulse stability and high single pulse energy (50muJ-1mJ) and belongs to the technical field of ultrashort laser pulse. By combining a cavity dumping SESAM (Semiconductor Saturable Absorption Mirror) locking mode with a regenerative amplifier, the stability of the high repetition frequency regenerative amplifier is improved and the generation of spontaneous amplified emission (ASE) is inhibited. The frequency of a cavity dumping mode-locking laser seed source is the same as the regenerative amplifying frequency, thus the utilizing efficiency of seed light is improved. A low-power pumping (-3W) is applied to the seed source so as to reduce the heat load of a laser crystal and the SESAM and facilitate the prolonging of the seed source. Externally-picked pulse of a mode locked laser is required to add lamda / 2 voltage to an electro-optic modulation crystal and the cavity dumping mode-locking laser is only required to add lamda / 4 or lower voltage to the electro-optic modulation crystal so as to reduce the heat load of an electro-optic modulation drive power source to be over three fourths and facilitate the improvement on the repetition frequency of the regenerative amplifier.

The invention discloses a regeneration amplifier with a first pulse inhibition function. The regeneration amplifier comprises a seed source, a pumping source and a regeneration amplification resonant cavity, wherein the cavity comprises elements of a gain medium, a controllable electro-optic switch, wave plates and the like. When a regeneration cavity does not work, parasitic oscillation can be generated between two or multiple lenses in the cavity; and inverted particles in the gain medium are consumed, so that saturation of the gain medium is avoided. When the regeneration cavity returns to work, the first pulse which is introduced into the regeneration cavity to be amplified does not obtain the gain which is obviously higher than that of the subsequent pulse; and the first pulse effect in an output pulse sequence of an amplifier is inhibited. No addition of the element in the first pulse inhibition process is achieved; the scheme is simple; and the cost is low. Furthermore, the regenerative amplifier is wide in application range and can be applicable to gain crystal with / without a birefrigent effect and a long / short regeneration cavity regeneration amplifier; through first pulse inhibition, relatively good output pulse uniformity can be obtained; meanwhile, vulnerable elements in the cavity are protected; the service lifetime of a laser device is prolonged; and the laser processing effect is improved.

An optical receiver includes: a converting unit that converts an optical signal into an electrical signal; an amplifying unit that amplifies the electrical signal; a regenerating unit that regenerates the amplified electrical signal; a correcting unit that performs correction of an error included in the regenerated electrical signal; a monitoring unit that performs monitoring of an optical current flowing through the converting unit; and a control unit that calculates a decision threshold based on a result of the correction and a result of the monitoring.

The invention discloses an artificial surface plasmon radiator based on F-P cavity loading and a control method. A metal grating and a Fabry-Perot F-P cavity are used, an electron beam passes throughthe gap between the metal grating and the Fabry-Perot, SSP is excited on the surface of the metal grating, the SSP is amplified through the interaction of SSP and free electron beam-wave interaction,when a power flow reaches a mirror of the F-P cavity, a part of power flow is reflected back into the F-P cavity, the beam-wave interaction continues, the remaining part of the power flow is outputtedfrom the F-P cavity and the metal grating, and the artificial surface plasmon radiator is achieved through a regenerative amplification mechanism. In the present invention, the F-P cavity effectivelyprolongs an interaction distance, and the high interaction efficiency can be obtained in a short interaction circuit, especially in an on-chip terahertz source system with weak electron beam current.The artificial surface plasmon radiator is simple and effective and can be used in a terahertz device and other vacuum electronic devices based on free electron beams.

The invention relates to a low-temperature Yb: yttrium aluminum garnet (YAG) regenerative amplifier. The low-temperature Yb: YAG regenerative amplifier consists of six parts, namely a pulse signal optical coupling system, an isolation system, an optical regenerative amplifying cavity, an electro-optical switch system, a low-temperature vacuum system and a pumping system; a sheet Yb: YAG crystal is used as a gain medium; by adoption of a pumping manner that a semiconductor laser device is back to the end face, the pulse signal light achieves an amplified gain effect due to temperature-controllable refrigeration of liquid nitrogen on the Yb: YAG crystal; and the stability of the amplified output energy is improved. By the low-temperature Yb: YAG regenerative amplifier, amplification of a pulse signal with high repetition frequency, high stability, high gain and high optical quality is realized.

The invention relates to a novel optical parametric chirped pulse amplification method which overlays and enhances original pump light in a cavity by making use of the structure of a ring cavity so as to enhance the power density of the pump light and then reuses the pump light by making use of optical path difference of signal light and the pump light in respective cavities thereof so as to improve transformation efficiency. At last, the method adopts a cavity dumping technique, chooses optimal parametric amplification times and controls the saturation effect during the parametric process to overlay and enhance the original pump light in the cavity. The method makes use of the structure of the ring cavity to ensure the pulse front edge and back edge of the pump light are overlaid in the cavity and has the advantages of making use of pumping source with wide pulse and high energy to obtain high energy burst pulse output and improving the transformation efficiency of the pump light to the utmost extent.

The invention discloses a low repetition frequency passively Q-switched regenerative amplification lamp-pumped pico-second laser which comprises a seed source. The seed source comprising a saturable absorber mirror used for passive Q-switching is provided with a resonant cavity and generates picosecond pulse seed light as laser light; one side of the output end of the seed source is provided with a regenerative amplification system which repeatedly oscillates the laser light entering into the seed source, an optical isolation system which prevents picosecond pulse seed light from returning to the seed source is disposed between the regenerative amplification system and the output end of the seed source; the optical isolation system is provided with a structure, the structure is capable of transferring the laser light which is oscillated repeatedly and transferred back by the regenerative amplification system to the outside world. According to the low repetition frequency passively Q-switched regenerative amplification lamp-pumped pico-second laser, a pico-second laser with a high-energy single pulse, a short pulse width and low repetition frequency can be obtained, the pico-second laser has the advantages that the cost is low and the structure is compact, moreover, no high voltage power supply is required, the mechanical stability is high.

The invention discloses an all-fiber high-energy pulse regeneration and amplification device based on a 2 * 3 optical switch. The device comprises the 2 * 3 optical switch, an all-fiber regeneration and amplification resonant cavity composed of the 2 * 3 optical switch, an ultrashort pulse laser seed source, a pulse broadening device, a pulse compression device and a detection and feedback controldevice. The 2 * 3 optical switch selectively inputs the pulse of the regenerative amplification resonant cavity and outputs the pulse from different ports. The input pulse of the all-fiber regenerative amplification resonant cavity is circularly amplified for multiple times in the resonant cavity, and the locking of the repetition frequency of the ultrashort pulse laser seed source and the all-fiber regenerative amplification resonant cavity and the synchronization between a 2 * 3 optical switch control signal and the ultrashort pulse laser seed source are ensured by using a detection and feedback control device. The high-energy pulse regeneration and amplification device can effectively replace a multi-stage amplification and frequency reduction structure in traditional high-power optical fiber laser amplification, the cost of high-energy ultrafast laser is reduced, and research and application of the ultrafast laser can be promoted.

The invention discloses a laser regeneration amplifier which comprises an all-solid picosecond laser mode locking oscillator, a first light path adjusting module, a curve-eight-shaped light path resonant cavity, a coupling module and a pumping module, wherein the curve-eight-shaped light path resonant cavity comprises a Q-switching crystal and a gain crystal which are placed in parallel, pumping light emitted by the pumping module enters the gain crystal through coupling of the coupling module, and seed light emitted by the all-solid picosecond laser mode locking oscillator passes through the first light path adjusting module for light path adjusting, then enters the curve-eight-shaped light path resonant cavity, is amplified for multiple times in the gain crystal and then is output through the Q-switching crystal. According to the technical scheme, regeneration amplified light can not return along the transmission light path of the seed light, and the influence on the seed light by the regeneration amplified light is effectively eliminated.

A high power solid-state non-regenerative optical amplification system (100) for amplifying a pulsed optical beam, includes a first optical amplification crystal (C1) and a second optical amplification crystal (C2) for amplifying the optical beam; optical pumping elements for longitudinal pumping amplification crystals (C1, C2); reflective optical elements (M′1, M′2, . . . , M′17) suitable for reflecting the optical beam so that the optical beam makes a total number of N sequential passes through the amplification crystals (C1, C2), wherein N is an integer and N>4. The reflective optical elements (M′1, M′2, . . . , M′17) are placed in a configuration suitable for alternatively interleaving the sequential optical beam passes through the 1st crystal (C1) and through the 2nd crystal (C2). A solid-state laser including the amplification system, and a method for amplifying a pulsed optical beam in a two-crystal multi-pass non-regenerative amplification system are also disclosed.

The invention discloses a laser capable of simultaneously outputting nanosecond pulses and pico-second pulses. The laser comprises a signal source, a signal isolation system and an amplifier. According to the invention, with an electric light control technology of combining an extra-cavity Pockels cell and intra-cavity Pockels cell, a regenerative amplification process is realized in case of signal light importing so as to obtain high-energy pico-second laser output, and cavity empty process is also realized in case of no signal light importing so as to obtain nanosecond pulse output; and the free combination of the two processes can be realized according to practical application demand, and as a result, free combination of numbers of the nanosecond pulses and the pico-second pulses in a single laser is realized and is output in an alternative way. The laser provided by the invention has an important application in high-precision high-efficiency fine processing field, as well as basic research fields such as plasma excitation, excited state control, chemical reaction control, special radiation excitation and the like.

The invention relates to the technical field of laser and provides a regenerative amplifier comprising a pumping component and a regenerative amplifying cavity, wherein a gain medium, a hollow opticalfiber component and an acousto-optic switch are arranged in the regenerative amplifying cavity; the hollow optical fiber component is used for extending a total optical path within the regenerative amplifying cavity and seed light is conducted thereon; the pumping assembly is used for providing energy for the gain medium; the gain medium is used for storing energy provided by the pumping component and the energy is extracted via seed light; the acousto-optic switch is used for injecting the seed light into the regenerative amplifying cavity and exporting the seed light which extracts the energy in the gain medium. In the regenerative amplifier disclosed in the invention, the hollow optical fiber module is used to extend the total optical path in the regenerative amplifying cavity, so thattime required for a laser pulse to be transmitted in the cavity for one cycle is more than 50 ns, the acousto-optic switch is enabled to be sufficient in efficiency and response time to turn on or off the laser pulse which is greater than 0.3 mm in beam diameter, requirements of the acousto-optic switch can be lowered, cost is saved and easy maintenance can be realized.

The invention discloses a laser regenerative amplifier based on a disc gain medium. The laser regenerative amplifier comprises a seed light source, an optical fiber coupling collimation module, a regenerative amplification resonant cavity, a pumping module and an optical isolator, wherein the regenerative amplification resonant cavity comprises a first polaroid, a Faraday rotator, a 1 / 2 wave plate, a second polaroid, a Pockels cell, a 1 / 4 wave plate, a first cavity mirror, a third cavity mirror, a fourth cavity mirror, a fifth cavity mirror, a disc gain medium, a seventh cavity mirror and an eighth cavity mirror, the first cavity mirror, the third cavity mirror and the fifth cavity mirror are concave mirrors, and the fourth cavity mirror, the seventh cavity mirror and the eighth cavity mirror are plane mirrors. Seed light oscillates in the regenerative amplification resonant cavity in a reciprocating mode, energy is amplified after the seed light passes through the disc gain medium every time, the lower thermal lens effect is achieved, the amplification efficiency linearization degree and the pulse stability are high, and extremely high light beam quality can be guaranteed.