A wavefront purification method for laser beams
A laser beam and wavefront technology, applied in lasers, laser parts, laser parts and other directions, can solve problems such as laser beam quality degradation, and achieve the effect of reducing uneven heat dissipation and improving laser beam quality
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example 1
[0069] A method for purifying a refractive index distributed wavefront suitable for a slab solid-state laser, comprising the following steps:
[0070] ①Optical material processing: Select optical materials with high laser transmittance. Different laser wavelengths should choose optical materials with different transmittance bands. For example, 1064nm laser can choose neodymium glass, Nd:YAG crystal or ceramics, etc. to process optical materials It can be formed into various three-dimensional structures. Taking a cuboid as an example, the two surfaces of the optical material can be polished and coated as the incident surface and the exit surface of the laser beam;
[0071] ②Make the TEC unit: The TEC unit is composed of a TEC patch 30 (semiconductor cooler TEC), a thermistor 32 and a heat conduction copper block 31. The heat conduction copper block 31 has a structure such as image 3 As shown, the size is 3×4×5(mm), where, The groove of the round hole is used to place the the...
example 2
[0081] Such as Figure 4 As shown, the laser wavelength is 1064nm, and the optical material 40 is coated with a 1064nm anti-reflection film on the laser incident surface and the outgoing surface. The beam mirror 50 splits the light, and the separated beam of weak light is measured by the four-wave transverse shearing interferometer 60 on the laser wavefront. One side of the optical material 40 is bonded with an array of TEC units 30. By collecting information on the distorted wavefront, the control The temperature distribution of the TEC unit 30 array purifies the distorted wavefront to obtain the purified laser beam 20 . The arrangement of TEC units 30 is as follows Figure 5 As shown, a 3*3 array is used with an interval of 5mm.
example 3
[0083] Optical path such as Figure 6As shown, the laser wavelength is 1064nm, and the optical material 40 is coated with a 1064nm anti-reflection film on the laser incident surface and the outgoing surface. The beam mirror 50 splits the light, and the separated beam of weak light is measured by the four-wave transverse shearing interferometer 60 on the laser wavefront. Both sides of the optical material 40 are bonded with an array of TEC units 30. By collecting the information of the distorted wavefront, The temperature distribution of the array of TEC units 30 is controlled to purify the distorted wavefront to obtain the purified laser beam 20 . Figure 7 It is a side view of the arrangement of the TEC units in Example 3 of the present invention. The positions of the TEC unit arrays on the two sides are staggered. The advantage of this arrangement is that the spatial resolution of the purifier is increased and the complex aberration is enhanced. Purification ability. The a...
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