BBO (barium boron oxide) crystal based non-linear frequency doubler
A frequency doubler and nonlinear technology, applied in the field of nonlinear frequency doublers based on BBO crystals, can solve the problems of unfavorable frequency doubled light beam quality, unfavorable frequency doubled conversion efficiency, etc.
Active Publication Date: 2013-09-18
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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This is not conducive to the improvement of frequency doubling conversion efficiency, nor is it conducive to the improvement of frequency doubling light beam quality
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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0020] Such as figure 1 As shown, the present invention provides a nonlinear crystal frequency multiplier for generating frequency multiplication in a resonant cavity, which includes two first BBO crystals 1 and a polarization direction rotation device with identical parameters for frequency multiplication 2 and the second BBO crystal 3, the polarization direction rotating device 2 can rotate the polarization direction of the fundamental frequency laser by 90 degrees, and this device can be a half-wave plate, a natural optical rotation plate, a magneto-optic modulator or an electro-optic modulator. The second BBO crystal 3 is rotated 90° along the direction of light transmission, and then placed symmetrically with the fir...
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The invention discloses a BBO (barium boron oxide) crystal based non-linear frequency doubler which is used for generating doubled frequency in a resonant cavity. The non-linear frequency doubler comprises a first BBO crystal, a polarization direction rotating device and a second BBO crystal, the second BBO crystal is rotated by 90 degrees along a light-transmitting direction, and then the second BBO crystal and the first BBO crystal are disposed on two sides of the polarization direction rotating device symmetrically. By the aid of the non-linear frequency doubler, parameters of the first BBO crystal and the second BBO crystal are exactly the same, so that after fundamental-frequency light experiences for multiple periods, frequency-doubling conversion efficiency of the fundamental-frequency light is compensated excellently, lengthening degree of frequency-doubled light spots along the direction of a line segment AB is tend to be consistent with that of the frequency-doubled light spots along the direction of a line segment AD, and the frequency-doubled light spots are presented as good circles; therefore, the frequency doubler can achieve high frequency-doubling conversion efficiency and good frequency-doubled light beam quality.
Description
technical field [0001] The invention relates to a nonlinear laser frequency multiplier, in particular to a nonlinear frequency multiplier based on a BBO crystal. Background technique [0002] Laser frequency doubling technology is the most important and widely used technology in nonlinear optics. It continuously expands the laser wavelength to the ultraviolet or even deep ultraviolet spectral region, and continuously expands the application field of laser. How to obtain efficient frequency multiplication conversion efficiency is a hot topic of research at home and abroad. β-phase barium metaborate crystal (β-BaB 2 o 4 , BBO) is a new frequency-doubling crystal discovered and developed for the first time by the Institute of the Structure of Matter, Chinese Academy of Sciences. It has the advantages of large effective nonlinear coefficient, good optical uniformity, high damage threshold and wide temperature acceptance angle. In particular, BBO crystal has The wide range of ...
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IPC IPC(8): H01S3/109
Inventor 林学春李梦龙侯玮汪楠晏诗恋孙伟于海娟
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI