Chinese Optics Letters, 2021, 19 (8): 081301, Published Online: Apr. 27, 2021
Near-infrared lasing and tunable upconversion from femtosecond laser inscribed Nd,Gd:CaF2 waveguides Download: 533次
Abstract
Optical channel waveguides with depressed cladding configurations have been produced in laser crystals by using ultrafast laser inscription. Waveguide properties are investigated in terms of guiding behaviors and localized laser-induced lattice damages. Under an optical pump of 808 nm light, continuous-wave waveguide lasing at 1.06 μm is achieved, with a single-mode operation and a minimum lasing threshold of 98.8 mW. Furthermore, the visible emissions of with short wavelengths ranging from 415 nm to 550 nm and long wavelengths from 550 nm to 625 nm are observed upon 808 nm laser excitation via the up-converted process. The intensity ratios of two wavelength ranges are proved to be tunable through changing the pumping polarizations.
Ruonan Li, Lifei Sun, Yangjian Cai, Yingying Ren, Hongliang Liu, Mark D. Mackenzie, Ajoy K. Kar. Near-infrared lasing and tunable upconversion from femtosecond laser inscribed Nd,Gd:CaF2 waveguides[J]. Chinese Optics Letters, 2021, 19(8): 081301.