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In this paper, we review recent progress in the development of GaSb-based saturable absorber mirrors used for mode-locking and Q-switching Tm/Ho fibre lasers. The typical semiconductor mirror consists of 18.5 pairs of AlAs0.08Sb0.92/GaSb quarter-wavelength layers deposited by molecular beam epitaxy on GaSb substrate.
A mode-locked laser/power-amplifier system based on Tm:Ho-doped silica fiber delivering femtosecond soliton pulses tunable from 1.972 mum to 2.15 mum with average output power up to 230 mW is reported. The master soliton oscillator and Raman shifter/amplifier were made of similar Tm/Ho fiber with length of 1.2 m and 4.5 m, respectively.
We report a femtosecond pulse source that uses a mode-locked Tm-Ho oscillator and a self-frequency shift of Raman solitons in Tm-Ho power amplifier. The master oscillator mode-locked by an antimonide-based saturable absorber mirror produces 750-fs transform-limited soliton pulses over the tuning range from 1912 to 1972 nm. The soliton self-frequency shift in the amplifier resulted in transform-limited...
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