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首页> 外文期刊>IEEE Journal of Quantum Electronics >Enhancement of the Mode Area and Modal Discrimination of Microchip Lasers Using Angularly Selective Mirrors
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Enhancement of the Mode Area and Modal Discrimination of Microchip Lasers Using Angularly Selective Mirrors

机译：使用角选择镜增强微芯片激光器的模式面积和模态识别

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摘要

Angularly selective mirrors (ASMs) are proposed as a means to expand the mode area and modal discrimination of microchip lasers. ASMs used as output couplers selectively reflect incoming $k$ vectors over a narrow angular range, while they transmit more inclined components. The eigenvalue problem of a microchip resonator equipped with a Gaussian ASM is solved analytically in the paraxial optics approximation using the ABCD matrix formalism. The narrow angular distribution of the reflected beam produces, through the laws of diffraction, a significant increase of the mode size and improved transverse mode discrimination, at the expense of higher oscillation threshold due to larger output coupling losses. Simulations performed using the parameters of ${hbox {Yb}}^{3+}$-doped YAG material show that one order of magnitude increase of the mode area can reasonably be achieved without causing overheating and thermal fracture. ASMs can be directly deposited on the active material in the form of a resonant grating mirror. This technology involves only planar batch processes that retain the mass production advantage of microchip lasers. The significant increase of brightness of microchips expected from this innovation will give rise to more effective and more compact devices and new applications.
机译：提出了角度选择镜（ASM），作为扩大微芯片激光器的模态面积和模态辨别力的一种手段。用作输出耦合器的ASM在狭窄的角度范围内选择性地反射传入的$ k $矢量，同时它们传输更多的倾斜分量。配备高斯ASM的微芯片谐振器的特征值问题通过使用ABCD矩阵形式主义在近轴光学近似中进行解析解决。通过衍射定律，反射光束的窄角度分布会导致模态尺寸的显着增加和横向模态分辨力的改善，但由于较大的输出耦合损耗而导致振荡阈值较高。使用掺入$ {hbox {Yb}} ^ {3 +} $的YAG材料的参数进行的仿真显示，可以合理地实现模态面积增加一个数量级，而不会引起过热和热断裂。 ASM可以以共振光栅镜的形式直接沉积在活性材料上。该技术仅涉及保留了微芯片激光器的批量生产优势的平面批处理过程。这项创新有望显着提高微芯片的亮度，这将带来更有效，更紧凑的设备和新应用。

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