Fiber Raman yellow laser based on main oscillation power amplifier

Abstract

The invention, which belongs to a laser technology field, discloses a fiber Raman yellow laser based on a main oscillation power amplifier. The laser of the invention comprises: a pumped fiber laser, a seed laser fiber resonance cavity, a seed laser Raman fiber amplifier and a frequency multiplier. An output terminal of the pumped fiber laser is coupled with an input terminal of the seed laser fiber resonance cavity through the fiber or forms direct fiber welding with the input terminal of the seed laser fiber resonant cavity. The output terminal of the seed laser fiber resonance cavity is coupled with the input terminal of the seed laser Raman fiber amplifier or forms the direct fiber welding with the input terminal of the seed laser Raman fiber amplifier. The frequency multiplier is located in an output terminal light path of the seed laser Raman fiber amplifier. A resonant wavelength of the seed laser fiber resonance cavity is two times of a target yellow wavelength. According to the invention, a volume is small. Cost is low and a line width is narrow. Using the laser is beneficial to control fundamental frequency light quality. High secondary harmonic conversion efficiency can be obtained.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a yellow Raman fiber laser based on a main oscillation power amplifier. Background technique [0002] Lasers with wavelengths in the range of 560-600nm are in urgent demand and widely used in biomedicine, medical cosmetology, food and drug testing, information storage, communication, military industry, and atmospheric remote sensing. For example, in medicine, because hemoglobin has a high absorption rate of laser with a wavelength of 585-595nm, the laser with this wavelength has an important application prospect in ophthalmology and dermatology; in the military, yellow laser can be used for the detection and identification of space targets; In the field of astronomical observation, the 589nm laser can be used as a laser guide star (LGS) light source in the adaptive optics system of a large ground-based telescope, enabling the telescope to produce high-resolution images near the diffraction limit....

AI Technical Summary

Problems solved by technology

[0006] Disadvantages: In frequency-doubled infrared laser technology, the gain peak of the fiber gain medium is around 1070nm, and the wavelength range from 1120nm to 1200nm is at the end of the gain spectrum. When LD is used to pump such fiber lasers, amplified spontaneous radiation will occur at short wavelengths ( ASE), which greatly reduces the conversion efficiency of pump light to 1120-1200nm wavelength, and even cannot form laser oscillation

[0008] Disadvantages: The 1583nm and 938nm sum frequency methods require two sets of pump sources and fiber amplifiers, and the equipment is relatively complicated. In addition, the two fundamental frequency lights introduce a large fundamental frequency optical power loss in the process of coupling into the frequency doubling crystal, so the use of 1583nm The yellow light power obtained by sum frequency method at 938nm is low;

[0010] Disadvantages: In the currently reported frequency-doubling Raman fiber laser method, it is not easy to have both high power and narrow linewidth of Raman signal light

However, for high-power Raman fiber lasers, the ability of fiber Bragg gratings to limit the weakening of signal spectral lines is extremely limited.

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