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Apparatus and method for lightening KTP crystal soil effect

A gray trace and effect technology, applied in the laser field, can solve the problems of reducing green light output power and frequency doubling conversion efficiency, and achieve good green light beam quality, avoid gray trace effect, and simple operation

Inactive Publication Date: 2009-05-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology can avoid the gray trace effect, it also reduces the output power and frequency conversion efficiency of green light.

Method used

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  • Apparatus and method for lightening KTP crystal soil effect
  • Apparatus and method for lightening KTP crystal soil effect
  • Apparatus and method for lightening KTP crystal soil effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The fundamental frequency light source used in the experiment is Nd:YAG laser, which works in the way of acousto-optic Q-switching, the repetition frequency is adjustable from 6 kHz to 15 kHz, the pulse width is 150 ns to 250 ns, and the output power is 48 W to 61 W. The size of the KTP crystal used is 5×5×15mm, the cutting angle of the crystal is θ=90°, φ=23.5°, placed in a heating furnace, and the temperature is controlled at 60°C. The focal length of the first lens 1 in the telescope system is f 1 =200mm, the distance to the laser output mirror is 200mm, by changing the focal length f of the second lens 2 2 To change the convergence ratio of the telescope system, thereby controlling the laser beam radius in the KTP crystal, the distance between the first lens 1 and the second lens 2 is d 1 =f 1 + f 2 .

[0027] The distance from the front surface of the KTP crystal 3 to the second lens 2 is d 2 . figure 2 shows the focal length of the second lens 2 in the tele...

Embodiment 2

[0030] image 3 It shows that in the case that the convergence ratio of the telescope system is 2:1 (the focal length of the second lens 2 is 100mm), d 2 When the values ​​are different, the relationship between the green light power of the double frequency output and the pulse repetition frequency. from image 3 It can be seen from that, with d 2 The reduction of the frequency doubling efficiency also increases gradually, when d 2=170mm, the frequency doubling efficiency reaches the maximum, and 18W green light is obtained under the condition of 9kHz. With the further reduction of the pulse repetition frequency, the gray trace effect appears under the condition of 7.5kHz. If continue to decrease d 2 value, the gray trace effect becomes more obvious. Under this experimental condition, d 2 =170mm is the optimum value, that is, the highest green light output power and frequency doubling conversion efficiency are obtained without gray trace effect.

[0031] Using Spiricon's...

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Abstract

The invention provides a device used for reducing KTP crystal grey tracking effect and a method thereof. The device mainly comprises a first lens, a second lens and a KTP crystal which are arranged on the same optical axis in sequence. The invention can avoid crystal grey tracking effect generated in the crystal, so as to obtain higher frequency multiplication efficiency and better green light beam quality. The device is simple and has no special optical element, and only a common commercial lens is used. The method has simple operation, only the distance between the KTP crystal and a convergence system needs to be adjusted continuingly from far place to near place, and the optimal result can be obtained.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a device and method for alleviating the gray trace effect of KTP crystals. Background technique [0002] In the field of laser technology, converting the 1064nm laser beam output by Nd:YAG laser into 532nm green light by doubling the frequency by nonlinear frequency conversion is a simple and feasible method to obtain green light output. In the frequency doubling process, only by converging the incident beam in the KTP crystal with a relatively small radius and increasing the peak power density of the fundamental frequency light can a higher frequency doubling conversion efficiency be obtained. But when using the Q-switched laser as the fundamental frequency light source, if the radius of the converging beam is too small, the gray trace effect will be generated in the KTP crystal. After the gray trace effect occurs, it will not only reduce the frequency doubling conversion effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/109
Inventor 刘崇葛剑虹陈军
Owner ZHEJIANG UNIV
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