Laser cooling in Tm:YLF and Tm:BYF crystals has recently been reported. We investigate high power laser cooling of Tm doped crystals under high vacuum using multiple-pass Herriott cell configuration. We also model potential mid-IR Radiation Balanced Lasers (RBLs) in available Tm:YLF and Tm:BYF crystals. Our experiments and modelling shows that our 1% wt. Tm:BYF sample is a promising 2 µm RBL candidate, since it has high gain and high external quantum efficiency as well as good room temperature cooling efficiency. We will attempt to demonstrate the first mid-IR RBL experimentally in Tm:BYF crystal as well.
Saeid Rostami, Zhou Yang, Alexander R. Albrecht, Aram Gragossian, Mostafa Peysokhan, Mohammadreza Ghasemkhani, Azzurra Volpi, Mauro Tonelli, and Mansoor Sheik-Bahae, "Advances in mid-IR solid-state optical cooling and radiation-balanced lasers (Conference Presentation)," Proc. SPIE 10550, Optical and Electronic Cooling of Solids III, 105500Q (Presented at SPIE OPTO: February 01, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2292267.5751542821001.
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