Laser Power Stabilization Using a Double Prism Attenuator

Sensors and Actuators A Physical（2025）

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Abstract

An electro-opto-mechanical device based on frustrated total internal reflection is designed and constructed for use in the laser beam power control. It is based on a double prism attenuator and it demonstrates high dynamic range continuous attenuation up to 120dB. The device is used to actively stabilize the power of a laser beam over a bandwidth of more than 1kHz. An enhancement of more than one order of magnitude in the power spectral density of the power fluctuations is obtained in closed-loop operation.

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Key words

Frustrated total internal reflection,Laser power stabilization,Electro-optical attenuator,Tunable attenuation,Electro-optical shutter

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【要点】：本文设计并构建了一种基于受抑全内反射原理的电光机械装置，实现了激光束功率的高动态范围连续衰减及超过1kHz带宽的稳定控制，显著提高了功率波动功率谱密度。

【方法】：利用双棱镜衰减器，通过受抑全内反射原理进行激光束功率控制。

【实验】：实验中，该装置成功应用于激光束功率的稳定控制，使用的数据集未明确提及，但结果显示在闭环操作中功率波动功率谱密度提高了超过一个数量级。