论文标题
二极管激光器的宽带电流调制频率稳定
Wideband current modulation of diode lasers for frequency stabilization
论文作者
论文摘要
我们为二极管激光系统提供了一种电流调制技术，该技术是专门针对高带宽激光频率稳定和具有平坦传递函数的宽带频率调制的。它由一个专用电流源和阻抗匹配电路组成，均位于激光二极管附近。使用外部腔二极管激光（ECDL）系统在现实条件下分析系统的转移行为。我们达到的相位滞后小于90 $°$最25 MHz，并且在直流达100 MHz的频率范围内的$ \ pm $ 3 dB的增益平坦度，而激光系统的被动稳定性不会受到损害。在两个ECDL系统之间的光学相锁环中证明了当前的调制方案的潜力，从而改善了42 mrad $ _ {RMS} $的相位噪声。设计文件可作为开源项目可用。
We present a current-modulation technique for diode-laser systems that is specifically designed for high-bandwidth laser-frequency stabilization and wideband frequency modulation with a flat transfer function. It consists of a dedicated current source and an impedance-matching circuit both placed close to the laser diode. The transfer behaviour of the system is analysed under realistic conditions employing an external-cavity diode laser (ECDL) system. We achieve a phase lag less than 90$°$ up to 25 MHz and a gain flatness of $\pm$ 3 dB in the frequency range of DC to 100 MHz while the passive stability of the laser system is not impaired. The potential of the presented current modulation scheme is demonstrated in an optical phase-locked-loop between two ECDL systems resulting in an improved phase noise of 42 mrad$_{rms}$. The design files are available as an open-source project.
