Erturk Zekican, Okuyucu Serdar, Kilinc Muharrem, Ozturk Yusuf, Pergament Mikhail, Kärtner Franz X, Demirbas Umit
Appl Opt. 2022 Dec 20;61(36):10735-10743. doi: 10.1364/AO.472548.
We studied the two-color lasing performance of a Cr:LiCAF laser using crystal quartz on-surface and off-surface optical axis birefringent filters (BRFs). Four different on-surface optical axis BRFs with thicknesses of 2 mm, 4 mm, 8 mm, and 16 mm, and three different off-surface optical axis BRFs with a diving angle of 25° and thicknesses of 2 mm, 4 mm, and 8 mm have been tested. Two-color lasing operation could be achieved in tens of different pairs of wavelengths using both types of BRFs. Regular on-surface optical axis BRFs provided two-color lasing in the 772-810 nm interval, with a discretely tunable wavelength separation of 1 to 37 nm (0.5 to 17 THz). In comparison, the off-surface optical axis BRFs enabled scanning of two-color lasing spectra in a much broader wavelength range between 745 nm and 850 nm with a discretely tunable wavelength separation of 0.8 to 99 nm (0.4 to 46 THz). The results clearly demonstrate the advantages of using off-surface optical axis BRFs to achieve two-color lasing with broadly tunable wavelength separation.
我们使用晶体石英表面和非表面光轴双折射滤光片（BRF）研究了Cr:LiCAF激光器的双色激光性能。测试了四种不同厚度（2毫米、4毫米、8毫米和16毫米）的表面光轴BRF，以及三种不同的非表面光轴BRF（折射角为25°，厚度为2毫米、4毫米和8毫米）。使用这两种类型的BRF，在数十对不同波长下均可实现双色激光运转。常规的表面光轴BRF在772 - 810纳米区间实现双色激光，波长间隔离散可调，范围为1至37纳米（0.5至17太赫兹）。相比之下，非表面光轴BRF能够在745纳米至850纳米的更宽波长范围内扫描双色激光光谱，波长间隔离散可调，范围为0.8至99纳米（0.4至46太赫兹）。结果清楚地证明了使用非表面光轴BRF实现具有宽可调波长间隔的双色激光的优势。
