A kind of neodymium-doped yttrium aluminum garnet dual-wavelength laser output medical device

Abstract

The invention relates to a neodymium-doped yttrium aluminum garnet dual-wavelength laser output medical apparatus comprising a reducer motor, a rotating arm, a frequency-doubling crystal body, an optical filtering mechanism, an absorption mechanism and a bottom plate. The frequency-doubling crystal mechanism comprises a frequency-doubling crystal arranged on the rotating arm. The optical filtering mechanism comprises a 45-degree glass filter. The frequency-doubling crystal and the 45-degree glass filter are located on a coaxial horizontal optical path. The absorption mechanism comprises a 45-degree reflector, an absorption cell and a reflector which are coaxial. The 45-degree reflector and the reflector are disposed at both ends of the absorption cell respectively. An original 1064 nanometer laser a forms a mixed laser b with dual wavelengths of 1064 nm and 532 nm by means of the frequency-doubling crystal. A pure 532nm frequency-doubled laser c is obtained to be output after the mixed laser b passes through the 45-degree reflector. The frequency-doubled remaining 1064nm laser d enters the absorption cell via the 45-degree reflector and is gradually and completely attenuated and absorbed and not any laser is reflected back to the original radiation optical path. The neodymium-doped yttrium aluminum garnet dual-wavelength laser output medical apparatus is low in cost and quick and easy in optical path adjustment, and does not generate any optical path deviation after long-term use.

Description

technical field [0001] The invention belongs to the technical field of laser medical devices, and in particular relates to a Q-switched neodymium-doped yttrium aluminum garnet frequency-doubling dual-wavelength laser output medical device. Background technique [0002] At present, the Q-switched neodymium-doped yttrium aluminum garnet frequency-doubling dual-wavelength laser output medical devices in the domestic and foreign markets are both 1064 nanometer wavelength and 532 nanometer wavelength switching output respectively. The wavelength switching technologies adopted by various manufacturers are different, and all have different defects. The specific description is as follows: [0003] (1) The laser output wavelength is switched by means of guide rail translational movement. This kind of design structure is complex, the cost is extremely expensive, and the processing precision is high. The long-term frequent use has the following defects: 1. After several decades of us...

AI Technical Summary

Problems solved by technology

The structure of this design is complex, the cost is extremely expensive, and the processing accuracy is high.

The long-term frequent use has the following defects: 1. The use of more than 10 years, the deformation of the guide rail material will reduce the accuracy of the guide rail and affect the frequency doubling efficiency of the laser

2. The long-term frictional movement of the guide rails will increase the fit gap of the guide rails, thereby reducing the accuracy of the guide rails and affecting the frequency doubling efficiency of the laser

Due to the long-term friction between the screw and the nut, the gap between the screw and the nut will be caused, which will also reduce the movement accuracy of the guide rail and affect the frequency doubling efficiency of the laser.

4. Processing technology and its complexity

[0007] 3. The manufacturing process of this design structure is complicated, resulting in high cost, and long-term use will cause optical path deviation

[0008] 4. The adjustment of this kind of optical path is extremely complicated, and the pitch angle of each lens must be adjusted up, down, left, and right to ensure the requirements of the laser optical path

Although the remaining 1064nm laser power after frequency doubling is relatively small, the destructive energy can cause tiny particles of 1 micron to 100 microns to splash around and pollute the laser.

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