All-solid-state yellow laser for medicine

Abstract

The invention discloses an all-solid-state yellow laser for medicine. The all-solid-state yellow laser comprises a pumping source system and a resonant cavity, wherein the pumping source system comprises a semiconductor laser and a focusing coupling lens system which are sequentially connected, the resonant cavity is a straight-line cavity and is arranged at an output end of the focusing coupling lens system, the resonant cavity comprise an input mirror, a gain medium, a yellow output mirror and an optical filter which are sequentially arranged, the gain medium is Dy:BSO, pumping light emitted from the semiconductor laser is focused in the gain medium in the resonant cavity by the focusing coupling lens system, the gain medium absorbs the pumping light, oscillation is generated in the resonant cavity to stimulate yellow laser, and the yellow laser sequentially passes through the yellow output mirror and the optical filter and is out. In the all-solid-state yellow laser, a combined mode of improving dosage concentration of active ions and increasing absorption range is adopted, a non-linear frequency conversion process is not needed, the absorption rate of the gain medium to the pumping light is effectively improved, and the stability of the all-solid-state yellow laser is improved.

Description

technical field [0001] The invention relates to the field of biomedicine, and more specifically, the invention relates to a medical all-solid-state yellow laser. Background technique [0002] The laser in the yellow band (center wavelength 580nm, wavelength range 597--577nm) is close to the most sensitive wavelength of the human eye (555nm). It has broad application prospects in the fields of national defense, military affairs and scientific research. In astronomical telescopes, the 589nm laser can replace the traditional sodium guide signal light source; in the military, it can be used for space target detection and identification; in medicine, the 579nm laser is very close to the absorption peak of oxyhemoglobin (577nm), especially in ophthalmology diagnosis and In terms of treatment, compared with lasers of other wavelengths, the yellow laser band has significant advantages and has an irreplaceable role. [0003] At present, yellow lasers mainly include dual-wavelength ...

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Problems solved by technology

[0004] There are three main ways to realize the solid-state yellow laser: one is to use the intracavity sum frequency method to obtain the yellow light output through the intracavity sum frequency method, the mode competition effect is obvious, the resonant cavity film system is complex, the conversion efficiency is low, and the beam The quality and stability are poor; the second is to use the fiber Raman laser amplification method, the phase control requires high precision and the system is relatively complicated; the third is to use the Raman laser frequency doubling method, and there is an additional thermal effect in the Raman crystal. It is difficult to obtain good beam quality at higher pump rates; the increase in thermal effects also has a greater impact on the stability of the laser

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