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Laser triple frequency system

A frequency doubling system and frequency triple technology, applied in the field of nonlinear optics, can solve the problems of not considering the influence of power density, only a series of points, and high cost, so as to improve the laser conversion efficiency, improve the compensation accuracy, save money cost effect

Inactive Publication Date: 2011-03-16
DAHENG NEW EPOCH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can improve the sum-frequency efficiency to a certain extent, there has been no definite conclusion on the optimal value of the size of the pre-walk-off, and the influence of the power density on the result of the walk-off compensation has not been considered.
Another outstanding shortcoming of the existing technology is that its walk-off compensation is mostly realized by nonlinear crystals, and the thickness of the nonlinear crystal is directly related to the amount of walk-off compensation, so in order to adjust the amount of walk-off compensation, it is necessary to select a series of different lengths The disadvantage of nonlinear crystals is that nonlinear crystals are expensive. If too many crystals are used, the cost of the entire walk-off compensation system will be too high; and the thickness of nonlinear crystals can only be a series of points, which cannot It is difficult to find the optimal value of the walk-off compensation due to continuous adjustment of the walk-off compensation
[0007] The current triple frequency system is mainly composed of the frequency multiplier system and the sum frequency system. Even if the above-mentioned walk-off compensation system is used to optimize the sum-frequency conversion efficiency, the highest conversion efficiency is only about 25%, which cannot be further improved.
Thus greatly limiting the application of frequency tripled light

Method used

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Experimental program
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Effect test

Embodiment 1

[0041] figure 1 is a schematic diagram of the triple frequency system of the present invention, wherein figure 1 a is the optical path diagram of the triple frequency system, from figure 1 In a, the beam expansion and focusing of the beam can be clearly seen; figure 1 b is the ray diagram of the triple frequency system, from figure 1 In b, the walk-off compensation of the beam can be clearly seen. The system includes a beam expander (power density adjustment device) 11, a focusing system 12, a frequency doubling system 13, a walk-off compensation device 14, and a frequency system 15; wherein the beam expander 11 is composed of a pair of confocal concave lenses and convex lenses, After the fundamental frequency light passes through the beam expander, its spot diameter is enlarged by a certain ratio, and the expanded spot is collected by the focusing device and then focused into the frequency multiplication and sum frequency system. According to formula (1), for the same focu...

Embodiment 2

[0047] figure 2 is a schematic diagram of the power density adjustment device (beam expander) of the present invention, figure 2 a. figure 2 b. figure 2 c is the combination of three pairs of confocal concave lenses and convex lenses respectively. The focal length ratios of the convex lens and the concave lens are 1.5, 2, and 2.5 respectively. According to the optical principle, after the parallel light passes through the three sets of beam expanders, the spot diameter can be enlarged respectively. 1.5, 2, 2.5 times, according to the formula (1), it can be seen that after passing through the same focusing system, its power density in the frequency doubling system and sum frequency system is also increased by 1.5, 2, 2.5 times correspondingly. In order to facilitate adjustment, three groups of beam expanders can be placed on a rotatable disc, such as figure 2 As shown in d, the switching of different beam expanders can be realized through the rotation of the disk, so as...

Embodiment 3

[0052] Figure 4 It is the triple frequency system of the present invention. The difference from Embodiment 1 is that a beam expander 44 is inserted between the frequency multiplier system 43 and the walk-off compensation device 45, and a beam expander 44 is inserted between the walk-away compensation device 45 and the sum-frequency system 47. A focusing system 46 is interposed and the sum-frequency system is movable relative to the focusing system 46 in the x-direction.

[0053] Compared with Embodiment 1, the advantage of this system is that the power density of the fundamental frequency light and the frequency-doubled light in the sum-frequency system can be further improved through the beam expander 44 and the focusing system 46, because generally speaking, through the frequency-doubled system The energy of the fundamental frequency light and frequency doubled light is relatively low, so in order to maintain a high power density, it is necessary to expand the beam again. ...

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Abstract

The invention discloses a laser triple frequency system, which belongs to the field of nonlinear optics. The system mainly comprises a focusing system, a frequency doubling system, a frequency summing system, a base frequency light power density adjusting device and a deviation compensating device, wherein base frequency laser enters the frequency doubling system after being focused by the focusing system so as to generate double frequency light in the frequency doubling system; the double frequency light and the remaining base frequency light enter the frequency summing system together so as to generate triple frequency light; the base frequency light power density adjusting device is arranged in front of the focusing system and can continuously adjust the power density of the base frequency light; and the deviation compensating device is arranged between the frequency doubling system and the frequency summing system and can continuously adjust a deviation compensating value. The laser power density and deviation compensation dosage are optimized, so that a higher triple frequency conversion efficiency is obtained; simultaneously, a doubly refracting crystal or dispersion glass is taken as the deviation compensating device, so that the cost of the triple frequency system can be lowered greatly.

Description

technical field [0001] The invention belongs to the field of nonlinear optics and relates to a frequency doubling system, in particular to a laser triple frequency system. Background technique [0002] Since the advent of laser in the 1960s, it has attracted widespread attention due to its high intensity, good directionality, and good coherence, and has been used in many fields such as lighting, measurement, and medical treatment. In the past 40 years, with the continuous development of laser technology, the emergence of mode-locking, Q-switching and CPA technology, the intensity of laser has been continuously improved, and its advantages in the field of laser processing have become more and more obvious. Its high conversion efficiency, high beam quality and high stability are favored by the laser processing industry. [0003] The current all-solid-state laser mainly uses a semiconductor laser with a wavelength of 800~1000nm as the pump source, and Nd:YAG crystal or Nd:YVO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/106H01S3/00
Inventor 张翼姚思一奚晓闫恒忠李翠杨晓红
Owner DAHENG NEW EPOCH TECH
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