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提出了一种易于实现、高空间精度、实时测量激光端面抽运固体激光器端面热形变的干涉测量方法。在一块热效应非常小的光学玻璃与晶体的抽运面之间形成空气劈尖,利用参考光扫描晶体端面准确地测出了激光二极管(LD)端面抽运固体激光器中晶体的端面热形变。抽运功率为12 W,抽运半径为0.5μm,抽运光束位于晶体端面中心时,晶体的伸长形变为0.645μm,鼓出形变量为0.259μm,总形变量为0.904μm。鼓出形变小于伸长形变,且表面凸起形变总是叠加在轴向伸长形变之上。研究表明表面凸起形变部分较为平坦且占据端面中心大部分区域,并发现热沉的侧面导热情况决定了晶体的伸长形变量。
An interference measurement method which is easy to realize and has high spatial accuracy and real-time measurement of the thermal deformation of laser end-face laser solid-state laser is presented. An air wedge is formed between a very small thermal effect optical glass and the pumping surface of the crystal. The end face thermal deformation of the laser in the laser diode (LD) end-pumped solid state laser is accurately detected by scanning the end face of the crystal with reference light. The pumping power is 12 W and the pumping radius is 0.5 μm. When the pumping beam is located at the center of the crystal face, the elongation of the crystal is 0.645 μm, the bulging deformation is 0.259 μm and the total deformation is 0.904 μm. Bulging out less than the elongation deformation, and the surface bulging deformation is always superimposed on the axial elongation above. The study shows that the convex part of the surface is flat and occupies most of the center of the end face. It is found that the heat conduction on the side of the heat sink determines the amount of elongation and deformation of the crystal.