Semiconductor side pumping module

Abstract

The invention provides a semiconductor side pumping module. By adopting the multidirectional even pumping technology, the side wall of a guide quartz tube is provided with a high reflection film and an anti-reflection film by segmenting for pumping light to reduce the loss of the pumping light; and a laser crystal combining a screw thread manufactured on the lateral surface and an un-doped matrix bonded on the end face is adopted for improving the absorption efficiency of the pumping light and reducing the end face effect and thermal lens effect of the laser crystal so as to improve the conversion efficiency and light beam quality of a laser. The guide quartz tube respectively adopts segmented film coating and non film coating on the side wall to carry out test comparison; when the pumping power is 1KW, the segmented film coating efficiency is improved by 16 percent compared with the non film coating efficiency; and in the state that the guide quartz tube is not coated with a film, when the pumping power is 1KW, the conversion efficiency of the laser crystal combining the screw thread manufactured on the lateral surface and the un-doped matrix bonded on the end face is improved by 9 percent compared with a common laser crystal, the thermal focal distance is shortened by about 12 percent, and the light beam quality M value is reduced by 17 percent.

Description

technical field [0001] The patent of the present invention relates to a semiconductor side pump module. Background technique [0002] Semiconductor-pumped solid-state lasers are mainly divided into two types in terms of pumping methods, namely end-face (longitudinal) pumping and side (horizontal) pumping. The end-face pumping method refers to pumping light from the end face of the laser crystal. The directions of the pump light and the laser light are on the same optical axis or the same; the side pumping method refers to the pump light exciting the side of the laser crystal, and the direction of the pump light is perpendicular to the direction of the laser light. The former has high conversion efficiency and is difficult to adapt to high-power operation, but it has been widely used in low- and medium-power lasers; the latter has low conversion efficiency, but is easy to achieve high-power operation, and is the first choice for high-power solid-state lasers. The laser media...

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Problems solved by technology

Reference [1] Chinese patent (200810044231.7, high comprehensive performance laser crystal and its preparation method) provides a method of making threads in laser crystal to improve the absorption efficiency of laser crystal to pump light, but there are still most of the pump light The situation that it is not incident on the surface of the crystal and is wasted; reference [2] Chinese patent (200710093817.8, high-power thulium laser) adopts ceramic reflectors uniformly distributed around the laser crystal to make the pump light pass through the laser crystal multiple times, but single pass The unabsorbed pump light of the laser crystal is repeatedly transmitted between the ceramic reflector, the guide quartz tube, the cooling liquid and the laser crystal, and the energy loss is large

In addition, a cylindrical lens is used to couple the horizontally stacked semiconductor laser beam to the surface of the laser crystal. Although this makes the pump beam pass through the laser crystal, the single absorption efficiency is still very low, and the placement of the cylindrical lens also consumes a certain amount of pump energy. Puguang

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