研究目的
Investigating the performance of a low-jitter, narrow-bandwidth, single longitudinal mode passively Q-switched Nd:YAG ring laser oscillator with external feedback for applications in optical communications, data storage, and high-resolution spectroscopy.
研究成果
The study successfully demonstrates a low-jitter, narrow-bandwidth, single longitudinal mode passively Q-switched Nd:YAG ring laser oscillator with external feedback. The design achieves SLM operation without intracavity spectral filters, with a pulse-to-pulse time jitter significantly reduced compared to previous work. The results suggest practical solutions for mitigating jitter in PQS lasers, enhancing their applicability in precision applications.
研究不足
The main limitation identified is the intrinsically higher pulse-to-pulse time jitter in passively Q-switched lasers compared to actively Q-switched lasers. The study aims to mitigate this through design optimization based on a rate-equations-based model.
1：Experimental Design and Method Selection:
The study employs a passively Q-switched ring laser oscillator with external feedback to achieve single longitudinal mode operation. The design includes a Cr:YAG saturable absorber for Q-switching and an external mirror for unidirectional oscillation to avoid spatial hole burning.
2：Sample Selection and Data Sources:
The laser setup uses a 10-W peak power, multimode fiber-coupled laser diode emitting at 808 nm as the pump source.
3：List of Experimental Equipment and Materials:
Equipment includes a Fabry-Perot scan interferometer (Thorlabs SA-200) for spectrum measurement, a Cr:YAG saturable absorber, and an intracavity half-wave plate combined with a polarizer for adjustable output coupling.
4：Experimental Procedures and Operational Workflow:
The laser resonator is 200-mm long, corresponding to a free spectral range of
5：4 GHz. SLM pulses of 34-μJ energy and 50-ns duration are obtained without intracavity spectral filters. Data Analysis Methods:
The pulse spectrum is measured and de-convolved to determine the bandwidth, with the time-bandwidth product calculated to assess the pulse's proximity to the Fourier limit.
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