We demonstrate a compact core-pumped 2 µm Tm3+, Ho3+-doped all-fiber laser passively Q-switched with an antimony-based saturable absorber. The 20 ns pulses are the shortest Q-switched pulses from a fiber laser operating beyond 1850 nm and were produced at a repetition rate of 57 kHz and pulse energy of 15 µJ using a short-length (4 ns) cavity. The large absorber modulation depth of ~70% together with transient gain compression is shown to provide an efficient mechanism for Q-switched pulse shortening.
© 2008 Optical Society of AmericaFull Article | PDF Article
B. Braun, F. X. Kärtner, G. Zhang, M. Moser, and U. Keller
Opt. Lett. 22(6) 381-383 (1997)
S. C. Huang, S. C. Liu, A. Li, K. W. Su, Y. F. Chen, and K. F. Huang
Opt. Lett. 32(11) 1480-1482 (2007)
Tommi Hakulinen and Oleg G. Okhotnikov
Opt. Lett. 32(18) 2677-2679 (2007)