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A frequency-doubled laser generator

A generation device and frequency doubling technology, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems of destroying the narrow linewidth characteristics of lasers, and the inability to obtain high-power single-frequency or narrow-linewidth frequency-doubling lasers, etc. Achieve the effect of suppressing SBS effect, reducing power spectral density and high output power

Active Publication Date: 2022-05-31
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of phase modulation, the linewidth of the single-frequency or narrow-linewidth laser needs to be broadened before amplification, which destroys the narrow linewidth characteristics of the laser to a certain extent, and the laser linewidth will be further widened after frequency doubling. Obtain high-power single-frequency or narrow-linewidth frequency-doubled lasers

Method used

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  • A frequency-doubled laser generator
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  • A frequency-doubled laser generator

Examples

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Embodiment 1

[0035] Single-frequency laser 1 is a single-frequency distributed feedback (DFB) fiber laser with a line width of less than 100MHz, and the center wavelength is 1064nm; the phase modulator 2 adopts an electro-optical phase modulator with a fiber tail, and the signal generator 3 adopts an arbitrary wave signal source. Wave signal, frequency 100MHz, output amplitude 6V; laser amplifier 4 is a rare earth doped fiber laser amplifier, and its gain fiber is ytterbium doped fiber, which is connected by a first-level isolator 4.1, a first-level ytterbium-doped fiber amplifier 4.2, and a second-level ytterbium-doped fiber amplifier. Isolator 4.3, two-stage ytterbium-doped fiber amplifier 4.4, ..., (N+1) / 2-stage isolator 4.N, (N+1) / 2-stage ytterbium-doped fiber amplifier 4.N+1, N is Odd number; the frequency doubling device 6 is a single-pass frequency doubling device, which is composed of an optical lens 6.1, a periodically polarized stoichiometric ratio lithium tantalate (PPSLT) freque...

Embodiment 2

[0037] The single-frequency laser 1 is a single-frequency external cavity semiconductor (ECDL) laser with a line width of less than 120 MHz, and the center wavelength is 1178 nm, which can be loaded with external radio frequency signals; the phase modulator 2 is an electro-optical phase modulator with a fiber tail; the signal generator 3 adopts any arbitrary Wave signal source, generating square wave signal, frequency 1.71GHz, output amplitude 10V; laser amplifier 4 is a fiber Raman laser amplifier, and its gain fiber is phosphorus fiber, including isolator of phosphorus fiber amplifier and phosphorus fiber amplifier; frequency doubling device 6 is a resonance frequency doubling device, including a cavity mirror and a digital cavity-locking servo system, which loads a 25MHz radio frequency signal on a single-frequency laser and outputs a triangular wave. After being amplified by the high-voltage amplifying module, it controls the piezoelectric ceramic PZT, and the triangular wav...

Embodiment 3

[0039] The single-frequency laser 1 is a distributed Bragg reflection (DBR) single-frequency fiber laser with a line width of less than 10MHz, and the center wavelength is 1018nm; the phase modulator 2 is a spatial electro-optical phase modulator; the signal generator 3 is a pseudo-random code signal source, generating 2 7-1 pseudo-random signal, pseudo-code rate 2Gbps, output amplitude 8V; laser amplifier 4 is a rare-earth doped solid-state laser amplifier, and its gain is ytterbium-doped yttrium aluminum garnet (Yb:YAG) crystal, which is connected in turn by a Stage Isolator 4.1, Stage I Yb:YAG Amplifier 4.2, Stage II Isolator 4.3, Stage II Yb:YAG Amplifier 4.4, Stage III Isolator 4.5, Stage III Yb:YAG Amplifier 4.6; Frequency Multiplier 6 is a single-pass frequency multiplication The device is composed of an optical lens, a beam splitter 6.1, and a frequency-doubling crystal lithium triborate crystal (LBO) 6.2.

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Abstract

A frequency doubling laser generating device, comprising: sequentially connected single-frequency lasers, phase modulators, laser amplifiers, space isolators and frequency doubling devices, and also includes a signal generator, which generates radio frequency or pseudo-random signals for use in Drive the phase modulator to modulate and output a single-frequency laser with a phase amplitude of Nπ. After the single-frequency laser is amplified by the laser amplifier, it is injected into the frequency doubling device through the space isolator to obtain the laser phase Single-frequency or narrow-linewidth frequency-doubled light with a modulation amplitude of 2Nπ, where N is an odd number. Since the phase modulator can achieve phase modulation in a wide wavelength range, and the high-power low-frequency fundamental frequency light obtained through the laser amplifier can be frequency-multiplied to obtain single-frequency or narrow-linewidth frequency-multiplied light, the structure is simple and With advantages such as flexible design, it provides a new technical solution for high-power, high-stability single-frequency or narrow-linewidth laser frequency doubling, and has high practical value and application prospects.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a frequency-doubling laser generating device for phase-modulated fundamental frequency light, which is used for generating frequency-doubling laser light with high spectral intensity. Background technique [0002] Visible light and ultraviolet lasers have important applications in display, quantum information technology, laser remote sensing, astronomy and geophysics, biomedical imaging and therapy, industrial processing, and cold atoms. Infrared laser frequency doubling is the most common method. The laser frequency doubling technology outside the cavity mainly includes single-pass frequency doubling and resonance frequency doubling, which is an effective way to obtain high-power visible light and ultraviolet lasers. In laser frequency doubling, to achieve high nonlinear conversion efficiency, the fundamental frequency light is required to be a single frequency or narrow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/08H01S3/10H01S3/109
CPCH01S3/109H01S3/06708H01S3/06754H01S3/08018H01S3/10053
Inventor 冯衍曾鑫崔淑珍
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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