Medical three-wavelength yellow and green laser

Abstract

The invention discloses a medical three-wavelength yellow and green laser. The medical three-wavelength yellow and green laser comprises a pump light generation unit, a light beam shaping unit, a gain medium unit, an etalon unit, a nonlinear crystal unit and an optical resonant cavity unit, wherein the pump light generation unit, the light beam shaping unit, the gain medium unit, the etalon unit and the nonlinear crystal unit are sequentially arranged on a light path, and the gain medium unit, the etalon unit and the nonlinear crystal unit are all arranged in the optical resonant cavity unit. The medical three-wavelength yellow and green laser utilizes the gain medium unit to achieve stable two-wavelength infrared laser operation, and then achieves output of three-wavelength yellow and green laser through an intracavity frequency doubling method and an intracavity sum-frequency method. Therefore, the medical three-wavelength yellow and green laser can effectively generate the three-wavelength yellow and green laser with high efficiency, a low threshold value and high stability, and largely improves the integrated performance.

Description

[0001] technical field [0002] The invention relates to a medical three-wavelength yellow-green laser, which belongs to the field of optoelectronics and laser technology. Background technique [0003] In recent years, all-solid-state yellow-green lasers have developed more and more rapidly due to their wide range of applications. Yellow-green lasers have important applications in laser shows, laser nanoguides, Bose-Einstein condensation, laser chemistry, atom cooling and trapping, laser biological effects, and laser medicine. Especially in medical treatment, it can be widely used in the diagnosis and treatment of diseases. First, in terms of disease diagnosis, yellow-green lasers can be used in flow cytometry and confocal laser microscopy. The yellow-green laser excites the fluorescent dye, and the beam after focusing and shaping is irradiated vertically on the cell sample flow, and the fluorescently stained cells produce scattered light and excite fluorescence under the ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly five methods for realizing yellow-green lasers: 1) Dual-wavelength intracavity sum-frequency: two kinds of oscillating light with different wavelengths are used, through intracavity sum-frequency The method of obtaining yellow light output has the disadvantages of obvious mode competition effect, complex resonator film system, low conversion efficiency, poor beam quality and stability, etc.

2) Optically pumped semiconductor vertical external cavity surface emitting laser: use semiconductor laser to pump semiconductor chip, obtain high beam quality near-infrared fundamental frequency laser under the constraint of resonator, and obtain high efficiency and high beam quality through intracavity frequency doubling Yellow laser output, the spontaneous emission amplification effect of this structure is more serious

4) Raman fiber laser / amplifier: use Raman fiber laser amplification to obtain high-power narrow-linewidth fundamental frequency infrared laser output; then obtain higher power and high-efficiency yellow laser output through extra-cavity frequency doubling, The phase control of the yellow laser with this structure requires high precision and the system is relatively complicated

[0005] At present, there are mainly the following problems in medical yellow-green lasers that need to be solved urgently. First, the output wavelength is single, and the practicability of the device is poor, so it is difficult to meet the needs of various applications in practice; Second, the conversion efficiency is low, and the light-to-light conversion efficiency is mostly lower than 10%. On the one hand, the low efficiency causes high power consumption, and on the other hand, it will cause a large thermal effect, which seriously affects the overall performance of medical yellow-green lasers.

Images