Corner pumping method for plate strip and its solid laser gain module
A solid-state laser and gain module technology, which is applied in the direction of excitation methods/devices, lasers, laser components, etc., can solve the problems of inability to couple pump light into the inside of the slab, inability to obtain high absorption efficiency, and high power expansion of lasers and other problems, to achieve the effect of reducing thermal lens effect and stress birefringence effect, good pumping uniformity, and improving overall efficiency
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[0021] Fig. 1 is an overall structural diagram of a solid-state laser gain module of the present invention. The gain block 20 includes a slat 22 and four pump sources 21 . The cross-section of the slat 22 adopts a rectangle or a square, with opposite incident surfaces 28 and outgoing surfaces 30 , four side surfaces 31 and four corner surfaces 32 . The number of corner faces is not limited to 4, but may be 8 or more.
[0022] The strip 22 consists of a high-refractive-index solid-state laser material. Due to total reflection, the incident light beam 26 travels along a zigzag optical path between the two reflective surfaces in the slab, as Figure 2a shown, this is called a zigzag amplifier. The zig-zag amplifier homogenizes the temperature gradient inside the slab, resulting in a uniform gain for the material. Thermal lensing and stress birefringence effects can be reduced by zig-zag optical paths, uniform pumping, four-corner injection, and thermal insulation at the edges ...
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