Efficient laser frequency doubler

A laser and frequency doubling technology, applied in the field of nonlinear optical frequency conversion laser, can solve the problems of nonlinear optical crystal polarization disorder, difficulty in design and debugging of resonator cavity, effect on effectiveness, etc., to achieve high conversion efficiency, improve conversion efficiency, improve The effect of frequency doubling efficiency

Inactive Publication Date: 2006-05-17
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] However, the above-mentioned methods have their own shortcomings, mainly due to their limited application range. For example, if the short pulse technology is used, the output frequency-doubled laser will also be a corresponding short pulse. If a long-pulse frequency-doubled laser is required, this method cannot be solved. In the method of walk-off compensation, when the crystal adopts type II phase matching, the polarization disorder is caused by the birefringent phase delay of the nonlinear optical crystal, which greatly affects its effectiveness, and it is difficult to achieve a better Compensation; the intracavity frequency doubling method needs to consider its polarization characteristics, time characteristics and other factors, the system is complex, and there are problems such as difficulties in the design and debugging of the resonator; the method of polarization modulation requires the use of two or more nonlinear optical crystals, etc.

Method used

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Experimental program
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Effect test

Embodiment 1

[0027] refer to figure 2 , to make a far-field direct coherent pump output 532nm laser frequency doubling device.

[0028] In the figure: the fundamental frequency laser uses a Nd:YAG solid-state laser pumped by a flash lamp to output laser light with a wavelength of 1064nm. Adjust the distance between the two beams of light and select the appropriate focal length so that the fringes of the far-field interference pattern are the least and the coherence is the best, and then the coherent combined laser is used as a pump source for a short nonlinear optical crystal KTP, and finally Output 532nm green light with higher efficiency than direct pumping.

Embodiment 2

[0030] refer to image 3 , to make a far-field coherent beam combining output 532nm laser frequency doubling device.

[0031] In the picture: Nd:YVO pumped by semiconductor laser as the fundamental frequency laser 4 The solid-state laser outputs laser with a wavelength of 1064nm. The laser is divided into two beams with the same power by a beam splitter, and then the two beams are coherent in the far field through a lens. The distance between the two beams is precisely adjusted and the appropriate focal length is selected to make it The far-field interference pattern has the least fringes and the best coherence. It can reach about 3 fringes, and then a beam combiner is formed by a birefringent interferometer to combine the beams into one energy that is mainly concentrated on one spot. At this time, the spot ratio The spot before the fundamental frequency laser beam splitting is small (see OPTICSLETTERS / Vol.21 (24): 1996, 1996 for the beam combining part), and the combined las...

Embodiment 3

[0033] refer to Figure 4 , making a schematic diagram of an embodiment of a reduced-beam coherent synthesis pump laser frequency doubling device;

[0034]In the figure: the fundamental frequency laser uses the excimer laser XeF to output laser with a wavelength of 351nm. The laser is divided into two beams of the same power by a beam splitter, and then the beam is first reduced by two times through a beam reducer composed of two convex lenses. The last two beams are coherent in the far field, precisely adjust the distance between the two beams and select the appropriate focal length, so that the far-field interference pattern has the least fringes and the best coherence, which can reach about 3 fringes, and then coherently synthesized The laser is used as the pump source of a short nonlinear optical crystal KBBF. Since the KBBF can double the frequency of deep ultraviolet and vacuum ultraviolet, it can finally output vacuum ultraviolet 175nm green light with higher efficiency...

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Abstract

The present invention relates to a high-efficiency laser frequency multiplier device. It includes basic frequency laser, light-beam beam splitter, coherent beam synthesizer and non-linear crystal. After the basic frequency laser is undergone the process of beam-splitting treatment, the coherent synthesis can be implemented, then the synthesized laser can be used as pump source of frequency multiplication laser to pump non-linear optical crystal finally can output multiple frequency laser with high conversion efficiency.

Description

technical field [0001] The invention relates to a nonlinear optical frequency conversion laser technology, in particular to a high-efficiency laser frequency doubling device. Background technique [0002] Frequency doubling is the most typical, most important, and most basic technology in nonlinear optical mixing, and it is also the most widely used technology; it can be said that frequency doubling is the basis of laser frequency conversion, which is of great significance to the development of laser high technology and the broadening of laser application fields. very important. Lasers of various wavelengths can be obtained through laser frequency doubling, such as red light, green light, blue light, ultraviolet and deep ultraviolet lasers, etc., which are used in large-screen laser display, laser medical treatment, high-density storage, microelectronics, micromechanics, Laser holography and pumped tunable optical parametric lasers have great application prospects and broad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35H01S3/00
Inventor 王博彭钦军许祖彦
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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