Clarke B S, Gould P L
Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA.
Rev Sci Instrum. 2022 Jan 1;93(1):013002. doi: 10.1063/5.0076633.
We have developed a system for producing amplified pulses of frequency-chirped light at 780 nm on nanosecond timescales. The system starts with tunable cw laser light and employs a pair of fiber-based phase modulators, a semiconductor optical amplifier, and a tapered amplifier to achieve chirp rates exceeding 3 GHz/10 ns and peak powers greater than 1 W. Driving the modulators with an arbitrary waveform generator enables arbitrary chirp shapes, such as two-frequency linear chirps. We overcome the optical power limitations of the modulators by duty cycling and avoid unseeded operation of the tapered amplifier by multiplexing the chirped pulses with "dummy" light from a separate diode laser.
我们已经开发出一种系统，可在纳秒时间尺度上产生780纳米频率啁啾光的放大脉冲。该系统以可调谐连续波激光开始，并采用一对基于光纤的相位调制器、一个半导体光放大器和一个锥形放大器，以实现超过3 GHz/10 ns的啁啾率和大于1 W的峰值功率。用任意波形发生器驱动调制器可实现任意啁啾形状，例如双频线性啁啾。我们通过占空比控制克服了调制器的光功率限制，并通过将啁啾脉冲与来自单独二极管激光器的“虚拟”光复用，避免了锥形放大器的无种子运行。
