Wei Jiao, Cao Xuechen, Jin Pixian, Su Jing, Lu Huadong, Peng Kunchi
Opt Express. 2021 Mar 1;29(5):6714-6725. doi: 10.1364/OE.419580.
In this study, the optimal condition of a multi-plate birefringent filter (BRF) used in a single-frequency continuous-wave (CW) tunable laser is theoretically and experimentally investigated. The dependence of the optimal condition on the diving angle of the BRF optical axis is first deduced. Based on the proposed optimal condition, the diving angle of the BRF optical axis is optimized to 29.1. Subsequently, a novel off-axis multi-plate BRF with a thickness ratio of 1:2:5:9 and the thinnest plate of 0.5 mm is designed and utilized in a tunable titanium:sapphire (Ti:S) laser. As a result, the operating wavelength of the Ti:S laser is successfully tuned from 691.48 to 995.55 nm by rotating the BRF 18. The obtained tuning slope efficiency and maximum tuning range are 16.9 nm/ and 304.07 nm, respectively. The experimental results agree well with the theoretical analysis results, which provide a feasible approach for designing BRFs to satisfy the requirements of other single-frequency CW wideband tunable lasers.
在本研究中，对用于单频连续波（CW）可调谐激光器的多片双折射滤光片（BRF）的最佳条件进行了理论和实验研究。首先推导了最佳条件对BRF光轴倾角的依赖性。基于所提出的最佳条件，将BRF光轴的倾角优化为29.1°。随后，设计了一种新型离轴多片BRF，其厚度比为1:2:5:9，最薄的片为0.5mm，并将其应用于可调谐钛宝石（Ti:S）激光器中。结果，通过旋转BRF 18°，Ti:S激光器的工作波长成功地从691.48nm调谐到995.55nm。获得的调谐斜率效率和最大调谐范围分别为16.9nm/°和304.07nm。实验结果与理论分析结果吻合良好，为设计满足其他单频CW宽带可调谐激光器要求的BRF提供了一种可行的方法。
