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Generation of solid laser with biquadratic harmonic wave

A solid-state laser, fourth harmonic technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of easy deliquescence of CLBO, soft and brittle materials, etc., achieve high conversion efficiency, avoid sudden changes, and prolong use. effect of life

Inactive Publication Date: 2006-11-01
HANS LASER TECH IND GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CLBO is easy to deliquescence and the material is soft and fragile, so it can be used in industrial products after gradually increasing

Method used

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  • Generation of solid laser with biquadratic harmonic wave
  • Generation of solid laser with biquadratic harmonic wave
  • Generation of solid laser with biquadratic harmonic wave

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Embodiment Construction

[0024] The principle of the fourth harmonic solid-state laser generation method of the present invention is as follows: figure 1 As shown, a fundamental wave oscillator is adopted, which includes a high-power laser diode array side pump module 7, a Q switch 3, a vertical linear polarizer 6, a mode-limiting aperture 2, and a terminal total reflection mirror (1, 10, 13), nonlinear crystals (9, 12) and angular mirrors (4, 5, 8, 11). Wherein the angle mirrors (4, 5, 8, 11) are intracavity small-angle mirrors. By calculating and measuring the thermal lens effect of the pump module 7 under different pump powers, and using the optical matrix method to calculate the spatial distribution of the Gaussian mode transmission in the cavity, the cavity length and the curvature of the end mirror are designed to make the infrared laser cavity thermally The lens still maintains a stable oscillation under a wide range of changes, and the calculation results are as follows Figure 2a and Figu...

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Abstract

The method comprises:high power density fundamental wave is forced on a double frequency nonlinear crystal to generate a second harmonic; said second harmonic is shot into a quad frequency nonlinear crystal; by using a multi reflection in one second harmonic cavity, the second harmonic is made to form a closed circuit multiple total reflection to generate an out of accumulated fourth harmonic solid laser; the second harmonic not being converted to the fourth harmonic is made a frequency doubling to reach a high conversion efficiency; a surface film damage of quad nonlinear crystal caused by shooting high power density second harmonic into the quad nonlinear crystal can be avoided by using a un-concentrated beam method to last the service life of nonlinear crystal; in addition, the method don't need to move the nonlinear crystal such that an sudden change of laser power caused by un-matching temperature of nonlinear crystal due to point to point scanning can be avoided.

Description

Technical field [0001] The invention relates to a fourth harmonic solid laser generation method. Background technique [0002] In recent years, the development of laser fine processing in the world has been extremely rapid. Its market output value has surpassed laser marking, and it has become the main laser industry second only to laser cutting and welding. Short-wavelength high-power ultraviolet laser has high resolution and high absorption. It is an important development direction of laser fine processing. [0003] Coherent of the United States has developed a Nd:YAG Q-switched quadruple frequency laser with an average laser power of 1-3w, which is mainly used for laser marking and TFT cutting; a continuous quadruple frequency laser with a laser power of 200mw has been developed, which is mainly used for semiconductor silicon wafers. Quality inspection and microlithography. [0004] US Spectra-Physics company has developed a laser average power 1 ~ 2w Q-switched Nd:YVO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/109
Inventor 周复正马淑贞陈莉英高云峰
Owner HANS LASER TECH IND GRP CO LTD
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