Xygkis Michalis, Linaraki Artemis N, Toutoudaki Eirini N, Katsoprinakis Georgios E, Rakitzis T Peter
Appl Opt. 2023 Oct 10;62(29):7730-7735. doi: 10.1364/AO.496780.
We demonstrate a method for determining small absorption coefficients and surface-scattering losses of crystals using cavity ring-down spectroscopy and perform measurements on magneto-optical crystals of terbium gallium garnet (TGG), terbium gallium phosphate (TGP), fused silica (FS), potassium terbium fluoride (KTF), and at 532 and 634 nm. Surface scattering is distinguished from absorption losses by using crystals of different lengths. A figure of merit (FoM) for magneto-optical crystals is defined to evaluate their suitability as intracavity optics in optical cavity applications. It is found that TGP has the highest FoM for crystal lengths up to ∼10 , whereas and FS potentially outperform TGP for longer crystals. Single-pass applications are also briefly discussed.
我们展示了一种使用腔衰荡光谱法测定晶体小吸收系数和表面散射损耗的方法，并在532纳米和634纳米波长下对铽镓石榴石（TGG）、磷酸铽镓（TGP）、熔融石英（FS）、氟化铽钾（KTF）等磁光晶体进行了测量。通过使用不同长度的晶体，将表面散射与吸收损耗区分开来。定义了磁光晶体的品质因数（FoM），以评估它们在光学腔应用中作为腔内光学元件的适用性。结果发现，对于长度达约10的晶体，TGP具有最高的FoM，而对于更长的晶体，KTF和FS可能优于TGP。还简要讨论了单程应用。
