Ho³⁺-Doped All-Fiber Laser Q-Switched by D-Shaped Fiber Carbon-Nanotube Saturable Absorber

Abstract

D-shaped fiber deposited with single-wall carbon-nanotubes was used as fiber-optic saturable absorber to achieve Q-switched Ho 3+ -doped fluoride fiber laser in all-fiber configuration with superior compactness and reliability. Stable Q-switched operation at 1192 nm was established at the pump power of 290 mW. When the pump power was increased to 1280 mW, Q-switched laser with a pulse duration of 1.1 μs and pulse energy of 0.11 µJ at a repetition rate of 127 kHz was obtained. This all-fiber laser exhibits high stability with a radio-frequency signal-to-noise ratio > 50 dB.

Mode-locked fiber laser of 3.5 µm using a single-walled carbon nanotube saturable absorber mirror

“…Another commonly used SA, the carbon nanotube (CNT), possesses an operating stability comparable to SESAM [28,29] . Previous works demonstrate that the singlewalled CNT (SWCNT) is of outstanding performance in realizing the mode-locking of near-infrared lasers [30][31][32][33][34][35][36] , and there is great interest in applying SWCNT to the mid-infrared region. Recently, Wei et al demonstrated SWCNT-based pulsed lasers operating at 2.8 μm [37] , and Chen et al reported SWCNT-based mode-locking in the 2.9 μm spectral region [36] .…”