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
CN112103758AActive Publication Date: 2020-12-18SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Publication Date
2020-12-18

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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.
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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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