A passively Q-switched nanosecond Tm-doped fiber laser at 1957 nm wavelength was demonstrated using a graphene-based saturable absorber. The absorber was fabricated with graphene grown by chemical vapor deposition and transferred onto a high-reflection mirror. Stable Q-switched laser pulses were observed with the shortest pulse width of 760 ns, a repetition rate of 202 kHz and a maximum average output power of 96 mW. Our experimental results suggest that graphene is suitable for a Q-switcher near 2 μm wavelength.
We demonstrate a passively Q-switched thulium-doped fiber laser by using single-walled carbon nanotube (SWCNT) polyvinyl alcohol (PVA) composite film as the saturable absorber (SA). A relatively large mode area on the SA was employed to avoid damage of the SWCNT/PVA film and benefit pulsed laser operation. Stable pulses of 85-164 kHz repetition rate were generated at 1967 nm with a maximum average output power of 103 mW. The single pulse energy was up to ∼0.63 µJ with ∼0.87 µs pulse duration.
Widely tunable operation of a mixed crystal Tm:(LuxY1−x)3Al5O12 (Tm:LuYAG) laser is reported using a volume Bragg grating (VBG) as the wavelength selective component. The operating wavelength was continuously tunable from 1935.3 to 1994.9 nm (corresponding to a tuning range of ∼ 60 nm), and a maximum output power of 1.76 W at 1999.7 nm was obtained for a launched pump power of 10.75 W with the VBG used at normal incidence.
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