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All solid-state medical double resonance intracavity sum frequency yellow light laser

A laser and all-solid-state technology, applied in the field of lasers, can solve the problems of expensive equipment and high cost

Inactive Publication Date: 2010-09-01
SUZHOU INST OF BIOMEDICAL ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of semiconductor quantum well materials requires expensive equipment, long-term technology accumulation and complex preparation processes, so the cost of semiconductor materials is much more expensive than solid-state laser materials

Method used

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  • All solid-state medical double resonance intracavity sum frequency yellow light laser
  • All solid-state medical double resonance intracavity sum frequency yellow light laser
  • All solid-state medical double resonance intracavity sum frequency yellow light laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] see figure 1 As shown, a kind of all-solid-state medical double-resonant intra-cavity sum-frequency yellow light laser includes: a first sub-cavity 1, a second sub-cavity 2 and a common cavity 3 shared by the first sub-cavity 1 and the second sub-cavity 2 ;

[0023] The first sub-cavity 1 includes: a pumping source 1, a first input cavity mirror 17, a first gain medium 13, a sum beam mirror 14, a sum frequency crystal 15 and an output coupling mirror 16 arranged sequentially on the first optical path 4. at a wavelength of λ 1 Beam;

[0024] The pumping source 1 includes: a first semiconductor laser 11 and a first optical coupling system 12;

[0025] The second sub-cavity 2 includes: the pumping source II, the second gain medium 23, the second input cavity mirror 26, the sum beam mirror 14, the sum frequency crystal 15 and the output coupling mirror 16 arranged sequentially on the second optical path 5, for at a wavelength of λ 2 Beam;

[0026]Pumping source II, co...

Embodiment 2

[0039] Embodiment 2 is similar to Embodiment 1, wherein the semiconductor laser 11 adopts a semiconductor laser array or a single-tube semiconductor laser with an output wavelength of 808nm;

[0040] The optical coupling system 12 is usually composed of a spherical mirror, an aspheric mirror, a cylindrical mirror, a self-focusing lens, an optical fiber, a prism or a binary optical lens, etc.;

[0041] The first gain medium 13 is changed to Nd:YVO 4 For laser crystals, the laser transition wavelength used is 1342nm, and the corresponding energy level transition is 4 f 3 / 2 arrive 4 I 13 / 2 , the first input cavity mirror 17 on the end face prepares a multi-layer dielectric film, which requires a reflectivity greater than 99.8% for 1342nm and a transmittance greater than 80% for 808nm, Nd:YVO 4 A 1342nm anti-reflection coating is prepared on the other light-passing surface of the laser crystal, and the transmittance is greater than 99.5%;

[0042] The second semiconductor las...

Embodiment 3

[0050] Embodiment 3 of the present invention such as figure 2 As shown, it is similar to Embodiment 1: in order to make the pumping light more fully absorbed, the second coupling optical system has increased the plane reflector 27, the third reflector 28 and the fourth reflector 29, and the reflective surface of the plane reflector 27 1. The concave surfaces of the third reflecting mirror 28 and the fourth reflecting mirror 29 are all prepared with 940nm high reflection film, and the reflectivity is greater than 99%; after the 940nm pumping light is emitted by the second semiconductor laser 21, it is first transmitted by the second coupling optical system Reflective mirror 25 focuses on Yb:YAG, and passes through Yb:YAG again after being reflected by the second input cavity mirror 26 on the end face of Yb:YAG. After passing through Yb:YAG twice, the unabsorbed 940nm pumping light is sent to The first reflection mirror 24 of the second optical coupling system is reflected to t...

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Abstract

The invention discloses an all solid-state medical double resonance intracavity sum frequency yellow light laser, comprising a first sub cavity, a second sub cavity and a public cavity shared by the first sub cavity and the second sub cavity; wherein the first sub cavity is used for generating light beam the wavelength of which is lambda1; the second sub cavity is used for generating light beam the wavelength of which is lambda2; and the public cavity is used for polymerizing the light beams the wavelengths of which are lambda1 and lambda2 respectively, then the polymerized light beam is transmitted into the sum frequency crystal of the public cavity, so as to generate light beam the wavelength of which is lambda3, and the light beam the wavelength of which is lambda3 is output from an outputting coupling mirror. The all solid-state yellow light laser of the invention is combined by a slice type structure capable of obtaining 578nm wavelength and intracavity sum frequency, can be used for substituting application of dye laser in the medical field, overcomes the defects of the prior art and achieves the aim of practicability.

Description

technical field [0001] The invention relates to a laser, in particular to an all-solid-state medical double-resonant intracavity sum-frequency yellow-light laser. Background technique [0002] It is known that the yellow light band with 577nm as the absorption peak is on an absorption peak of human oxyhemoglobin. Compared with the other two absorption peaks of green light and blue light in the short-wave direction, this absorption peak has a lower absorption coefficient for melanin in human skin and lutein in the macular area of ​​the human eye, so it is a more valuable laser band. . Due to the low absorption coefficient of melanin in this band, the yellow light absorption peak can penetrate deeper skin, which is a suitable band for the treatment of deep subcutaneous vascular diseases. Due to the low absorption coefficient of lutein, the yellow light wavelength can concentrate the laser energy in the retinal tissue affected by diabetes, retinopathy and wet macular degenera...

Claims

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Application Information

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IPC IPC(8): H01S3/23H01S3/16H01S3/10
Inventor 檀慧明田玉冰崔锦江王帆施燕博高静林洪沂
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH
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