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High-power multi-single-frequency optical fiber laser frequency doubling system and method

A fiber laser, frequency doubling system technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problem of reducing the power spectral density of the frequency band, achieve a wide wavelength range, improve output power, and stabilize high-power frequency doubling The effect of laser output

Active Publication Date: 2020-09-29
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the modulation depth increases, the SBS threshold will increase significantly, because the modulation depth will generate more frequency components, thereby reducing the power spectral density of the entire frequency band, thereby suppressing SBS, but the upper limit of the modulation depth is limited by the phase modulator. Due to the limitation of modulation voltage, there is a certain upper limit for increasing the modulation depth and raising the SBS threshold

Method used

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  • High-power multi-single-frequency optical fiber laser frequency doubling system and method
  • High-power multi-single-frequency optical fiber laser frequency doubling system and method
  • High-power multi-single-frequency optical fiber laser frequency doubling system and method

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Effect test

Embodiment 1

[0065] A single-frequency laser with a line width of less than 100MHz is used. The single-frequency laser is a distributed feedback (DFB) semiconductor laser. The center wavelength can be 1064nm, and an external radio frequency signal is loaded; the signal generator uses a radio frequency signal source, and the period generated by the radio frequency signal source Sine signal, frequency 3.2GHz, output power 25dBm; phase modulator is electro-optical phase modulator EOM; fiber amplifier (4) is a rare earth doped fiber amplifier, and its gain fiber is ytterbium doped fiber; frequency doubling crystal 65 is β-bias Barium borate crystal (BBO); the resistance of thermistor 662 is 10K ohm; the heat source 663 is a heating chip. The FPGA-based digital cavity-locked servo system loads a 25MHz RF signal on the single-frequency laser and outputs a triangular wave. After being amplified by a high-voltage amplifier module, it controls the piezoelectric ceramic PZT. The frequency of the tria...

Embodiment 2

[0068] A single-frequency laser with a line width of less than 100MHz is used. The single-frequency laser is a distributed feedback (DFB) fiber laser with a center wavelength of 1064nm and an external radio frequency signal is loaded; the signal generator uses a radio frequency signal source, and the period generated by the radio frequency signal source Square wave signal with a frequency of 1.6GHz and an output power of 15dBm; the phase modulator is an electro-optical phase modulator EOM; the fiber amplifier (4) is a Raman fiber amplifier, and its gain fiber is a quartz fiber; the frequency doubling crystal 65 is a lithium triborate crystal (LBO); the resistance of the thermistor 662 is 10K ohms; the heat source 663 is a semiconductor cooling chip; the digital lock cavity servo system based on the programmable gate array FPGA loads a 15MHz radio frequency signal on the single-frequency laser, and outputs a triangular wave, After being amplified by the high-voltage amplifier mo...

Embodiment 3

[0071] A single-frequency laser with a line width of less than 100MHz is used. The single-frequency laser is an external cavity semiconductor (ECDL) laser, and the center wavelength can be 1178nm. The single-frequency laser passes through a phase modulator that loads an external radio frequency signal; the signal generator adopts radio frequency Signal source, the periodic triangular wave signal that radio frequency signal source produces, frequency 16GHz, output power 20dBm; Phase modulator is electro-optical phase modulator EOM; Fiber amplifier (4) is rare earth doped fiber amplifier, and its gain fiber is erbium-doped fiber; The frequency doubling crystal 65 is potassium titanyl phosphate crystal (KTP); the resistance of the thermistor 662 is 100 ohms; the heat source 663 is a heating chip. The digital lock cavity servo system based on programmable gate array FPGA loads a 15MHz radio frequency signal on the photoelectric phase modulator through which the single-frequency las...

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Abstract

The invention discloses a high-power multi-single-frequency optical fiber laser frequency multiplication system and method. The system comprises a single-frequency laser (1), a phase modulator (2), asignal generator (3), an optical fiber amplifier (4), a spatial isolator (5), a resonance frequency multiplication device (6) and a cavity locking device (7). The method comprises the steps of: performing phase modulation on the single-frequency laser by adopting a periodic signal to generate multiple single frequency lasers, by controlling the frequency interval [delta][omega] of multiple single-frequency lasers, matching [delta][omega] with integral multiples of a free spectral region of the frequency doubling cavity, and changing the modulation depth of the multi-single-frequency laser by controlling the output power of periodic signals, so that the generated multi-single-frequency laser at least contains three frequency spectrum components, the SBS threshold value of the fiber laser isincreased, and high-power and narrow-linewidth frequency doubling laser output is obtained.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a high-power multi-single-frequency fiber laser frequency doubling method and system. Background technique [0002] Visible light and ultraviolet lasers have important applications in the fields of laser display, laser detection, medical imaging and treatment, laser communication, cold atoms and other basic scientific research. Fiber laser frequency doubling is an effective means to obtain high-power visible and ultraviolet lasers. Fiber lasers have developed rapidly in terms of high power and narrow linewidth single-frequency lasers. There are two main types of existing fiber laser frequency doubling technologies, including: single-pass frequency doubling and resonance frequency doubling. Single-pass frequency doubling technology, using periodically polarized crystals, such as PPKTP, PPLN, PPSLT, etc., has a simple structure and does not require a complex frequency sta...

Claims

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Application Information

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