Continuous-Wave and Mode-Locked Operation of an In-Band Pumped Tm

Identifier:  imarina:9333602

Handle: https://hdl.handle.net/20.500.11797/imarina9333602

Authors:  Zeng, Huangjun; Xue, Wenze; Murray, Robert T; Chen, Weidong; Pan, Zhongben; Wang, Li; Cui, Chen; Loiko, Pavel; Mateos, Xavier; Griebner, Uwe; Petrov, Valentin

Abstract:
We investigate in-band pumping of a Tm,Ho,Lu:CaGdAlO4 laser using a Raman-shifted Er-fiber laser (1678 nm), in the continuous-wave (CW) and mode-locked (ML) regimes. A maximum output power of 524 mW is obtained in the CW regime with a 5% output coupler at an absorbed pump power of 2.04 W, corresponding to a slope efficiency of 27.9%. A maximum CW wavelength tuning range of 160 nm at the zero level, from 1984 to 2144 nm, is obtained with a 0.2% output coupler. In the ML regime, pumping with 5.5 W (unpolarized), the average output power (0.2% output coupler) reaches 148 mW at a repetition rate of similar to 96 MHz. The output spectrum is centered at 2071.5 nm with a FWHM of 21.5 nm (sigma-polarization). The pulse duration amounts to 218 fs (time-bandwidth product equal to 0.327).