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Abstract
Ceramic YAG/Yb:YAG/YAG planar waveguide lasers were realized on continuous-wave and mode-locked operations. The straight waveguide, fabricated by non-aqueous tape casting and solid state reactive sintering, enabled highly efficient diode-pumped waveguide continuous-wave laser with the slope efficiency of 66% and average output power of more than 3 W. The influence of the waveguide structure on the wavelength tunability was also experimentally investiccgated with a dispersive prism. Passively mode-locked operation of the ceramic waveguide laser was achieved by using a semiconductor saturable absorber mirror (SESAM), output 2.95 ps pulses with maximum power of 385 mW at the central wavelength of 1030 nm.
Highlights
As planar waveguide structures offer particularities of high gain, spatial mode control, exceptional thermal management, and optical confinement with respect to traditional bulk materials[1], planar waveguide laser is believed to play a crucial role in attaining efficient and compact lasers of high average powers and low lasing thresholds[2]
Based on the results above, we can see that the total tuning range kept comparable level with the previous results obtained by bulk ceramic with the same Yb-doping concentration[23], this YAG/Yb:YAG/YAG planar waveguide ceramic demonstrated lower laser threshold and improved pump efficiency due to the long pump-intersection lengths in high intensity and the optical confinement for transverse mode
We report on CW and mode-locked performances of a diode-pumped non-aqueous tape casting fabricated YAG/Yb:YAG/YAG planar waveguide ceramic laser
Summary
With the help of a dispersive prism, the tunable range of the planar waveguide ceramic was measured. In the mode-locking operation, we carefully optimized the Z-fold cavity for clean and pedestal-free pulses with stable output in the fundamental mode. The beam quality factors of the CW mode-locked ceramic waveguide laser were recorded by using a laser beam analyzer (Spiricon, M2-200S) at the maximum output power of 385 mW. The relatively large near-field mode profile was mainly caused by the diffusion of Yb3+ ions along the thickness direction during the sintering process[16]
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