Volpi Azzurra, Kock Jackson, Albrecht Alexander R, Hehlen Markus P, Epstein Richard I, Sheik-Bahae Mansoor
Opt Lett. 2021 Mar 15;46(6):1421-1424. doi: 10.1364/OL.419551.
Knowledge of saturation intensity of gain or absorption plays a fundamental role in a variety of applications ranging from lasers to many nonlinear optical processes. Here, we present an analytical expression for open-aperture Z-scan transmission for accurately measuring the saturation intensity in the low absorbance samples but at arbitrary pump intensities. We exploit this formalism to investigate the absorption saturation of : (YLF:Yb) in the anti-Stokes excitation region for optical refrigeration at high pump intensities. An absorption saturation intensity of 14.5±1/ was measured in YLF:Yb at 1020 nm (||) at room temperature.
增益或吸收的饱和强度知识在从激光到许多非线性光学过程的各种应用中起着基础性作用。在此，我们给出了开孔Z扫描透射的解析表达式，用于在任意泵浦强度下精确测量低吸收样品中的饱和强度。我们利用这种形式来研究用于光制冷的高泵浦强度下反斯托克斯激发区域中：(YLF:Yb)的吸收饱和。在室温下，在1020 nm（||）处测量了YLF:Yb中的吸收饱和强度为14.5±1/ 。
