High-power frequency doubling single-frequency laser generating device for phase modulation and demodulation

A phase modulation, single-frequency laser technology, which is applied in lasers, laser components, phonon exciters, etc., can solve the problems of destroying the narrow linewidth characteristics of lasers, and cannot obtain single-frequency frequency-doubled lasers, etc., to suppress the SBS effect , flexible and portable design, flexible modulation effect

Active Publication Date: 2020-12-18
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

However, since the linewidth of the single-frequency or narrow-linewidth laser needs to be broadened in the phase modulation process before being amplified, the narrow linewidth characteristics of the laser are destroyed to a certain extent, and the laser linewidth will continue to widen after frequency doubling. This method generally cannot obtain single-frequency frequency-doubled lasers, and many high-end applications require single-frequency frequency-doubled lasers

Method used

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  • High-power frequency doubling single-frequency laser generating device for phase modulation and demodulation
  • High-power frequency doubling single-frequency laser generating device for phase modulation and demodulation
  • High-power frequency doubling single-frequency laser generating device for phase modulation and demodulation

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Embodiment 1

[0055] The single-frequency laser 1 is a distributed Bragg reflection (DBR) fiber laser with a center wavelength of 1120nm and a line width of 10MHz; the signal generator 3 uses a radio frequency signal source to generate two sinusoidal signals, one with a frequency of 1.6GHz and a phase of 0°, and the output The power is 23dBm, the other frequency is 1.6GHz, the phase is -91° or 269°, and the output power is 29dBm; the first phase modulator 2 is an electro-optic phase modulator; the fiber amplifier 4 is a Raman fiber amplifier, and its gain fiber is a silica fiber; The frequency doubling crystal 626 is periodically poled lithium niobate (PPLN); the second phase modulator 7 is a spatial electro-optic phase modulator. The central wavelength of the single-frequency laser 1 can also be any wavelength within the range of 1-2 μm. The frequency doubling crystal 626 can also be PPSLT, PPKTP, KTP, KDP, BBO, CLBO or LBO, etc. The gain fiber of the optical fiber amplifier 4 can also be...

Embodiment 2

[0057] The single-frequency laser 1 is an external cavity semiconductor (ECDL) laser with a central wavelength of 1178nm and a line width of 1MHz, which is loaded with an external radio frequency signal; the signal generator 3 uses a radio frequency signal source to generate two periodic sinusoidal signals, one with a frequency of 1.6GHz and a phase of 0°, the output power is 23dBm, another frequency is 1.6GHz, the phase is -99° or 260°, the output power is 29dBm; the first phase modulator 2 is an electro-optic phase modulator; the fiber amplifier 4 is a Raman fiber amplifier, and its gain fiber It is a phosphate optical fiber; the frequency doubling crystal 626 is a lithium triborate crystal (LBO); the digital lock cavity servo system based on FPGA adopts the PDH lock cavity technology, loads a 12MHz radio frequency signal on the single frequency laser, and outputs a triangle wave, which is high voltage After the amplifying module is amplified, the piezoelectric ceramic PZT is...

Embodiment 3

[0059] The single-frequency laser 1 is a distributed Bragg reflection (DBR) fiber laser with a central wavelength of 1064nm and a linewidth of less than 100kHz; the signal generator 3 uses a square wave signal source to generate two periodic square wave signals, one with a frequency of 100MHz and a phase of 0 °, the output power is 17dBm, another frequency is 100MHz, the phase is -100° or 260°, and the output power is 23dBm; the first phase modulator 2 is an electro-optic phase modulator; the fiber amplifier 4 is a rare earth doped fiber amplifier, and its gain fiber is Neodymium-doped optical fiber; the frequency doubling crystal 626 is periodically polarized stoichiometric lithium tantalate (PPSLT); the second phase modulator 7 is a spatial electro-optical phase modulator. The central wavelength of the single-frequency laser 1 can also be any wavelength within the range of 1-2 μm. The frequency doubling crystal 626 can also be PPLN, PPKTP, KTP, KDP, BBO, CLBO or LBO, etc. T...

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Abstract

A high-power frequency doubling single-frequency laser generating device for phase modulation and demodulation comprises a single-frequency laser (1), a first phase modulator (2), an optical fiber amplifier (4), a spatial isolator (5), a frequency doubling device (6) and a second phase modulator (7) which are connected in sequence, and further comprises a signal generator (3). The device is characterized in that the signal generator (3) generates two periodic signals with the same shape and frequency, the first phase modulator (2) and the second phase modulator (7) are driven respectively, thephase difference of the two periodic signals is npi-delta phi, wherein n is an odd number, delta phi is phase delay generated by laser transmission amplification between the second phase modulator (7) and the first phase modulator (2), and the modulation depth of the second phase modulator (7) is twice that of the first phase modulator (2). Single-frequency fundamental frequency light is generated through single-frequency fundamental frequency light phase modulation, a laser SBS threshold value is improved, high-power multi-single-frequency frequency doubling light is obtained after amplification and frequency doubling, the frequency doubling light is subjected to phase demodulation, and high-power single-frequency frequency doubling light is obtained. According to the scheme, the single-frequency laser has the characteristic of frequency doubling line width before phase modulation, has the characteristics of simple and flexible structure, good light beam quality and the like, provides a new scheme for frequency doubling of the high-power single-frequency laser, and has an important practical value.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a high-power frequency-multiplied single-frequency laser generating device for phase modulation and demodulation. Background technique [0002] Visible light lasers have important applications in detection, communication, medical detection and treatment, industrial processing, and cold atoms. Fiber laser frequency doubling technology mainly obtains high-power visible and ultraviolet lasers through single-pass frequency doubling and resonance frequency doubling. In laser frequency doubling, to achieve high nonlinear conversion efficiency, the fundamental frequency light is required to be a single-frequency or narrow-linewidth laser. As the power of single-frequency, narrow-linewidth fiber laser increases, due to the small cross-sectional area of ​​the fiber core and the long interaction distance, it is easy to cause various nonlinear effects, especially stimulated Brillou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/10H01S3/109H01S3/115
CPCH01S3/115H01S3/10053H01S3/109H01S3/06754H01S3/06712
Inventor 冯衍曾鑫崔淑珍
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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