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Design considerations for a 50-W cw fundamental mode diode-pumped solid state laser

机译:50 W CW基本模式二极管泵浦固态激光器的设计注意事项

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Abstract: eve the design goal of 50 watts cw in a single-frequency, fundamental mode we have chosen a slab laser design. The slab geometry with a zig-zag optical path eliminates stress birefringence and thermal focusing to first order in a uniformly pumped, ideal slab. However, at the thermal loads we are considering, higher order effects become significant. We have developed a computer program to analyze the full three dimensional behavior of the thermally loaded slab and have used this code in an attempt to minimize the wavefront distortion of a beam as it traverses the slab. The resonator design is also critical in achieving single-frequency, fundamental mode operation with high extraction efficiency. Because of the rectangular geometry and size of the slab laser, we have chosen to build a stable-unstable resonator. Single frequency operation is obtained by injection locking a ring cavity. Mode selection is achieved in the wide transverse direction of the slab by using an unstable cavity with a super-Gaussian mirror. An unstable resonator supports large mode volumes and has large discrimination against higher order transverse modes. In addition, a super-Gaussian mirror profile provides efficient extraction in a high quality mode. Our resonator design should lead to efficient operation in a near TEM$-00$/ mode with a slope efficiency approaching those of slab lasers with multimode output. !18
机译:摘要:为了在单频基本模式下实现50瓦连续波的设计目标,我们选择了平板激光器设计。具有曲折光路的平板几何形状消除了应力双折射和均匀聚焦的理想平板中的一阶热聚焦。但是,在我们考虑的热负载下,高阶效应变得很明显。我们已经开发了一个计算机程序来分析热加载板的整个三维行为,并使用此代码来尝试使横穿板的光束的波前畸变最小。谐振器设计对于以高提取效率实现单频基本模式操作也至关重要。由于平板激光器的矩形几何形状和尺寸,我们选择构建一个稳定不稳定的谐振器。通过注入锁定环形腔来获得单频工作。通过使用带有超高斯镜的不稳定腔,可以在平板的宽横向上实现模式选择。不稳定的谐振器支持较大的模式体积,并且对高阶横向模式具有较大的区分度。此外,超高斯镜面轮廓可在高质量模式下提供有效的提取。我们的谐振器设计应能在接近TEM $ -00 $ /模式下高效运行,其斜率效率接近具有多模输出的平板激光器的斜率效率。 !18

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