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
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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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