Gain-switched Tm3+-doped double-clad silica fiber laser

Abstract

A gain-switched Tm-doped double-clad silica fiber laser operating at a wavelength of approximately 2microm with moderate output energy of 14.7mJ per pulse and a slope efficiency of 39.5% (with respect to launched pump energy) is realized pumped at 1.064microm from a Nd:YAG laser. The gain-switched fiber laser pulses are built up by a series of relaxation spikes, and every spike pulse duration is nearly 1micros. The output wavelength becomes longer, and the slope efficiency increases with the increase in fiber length.

Influences of amplified spontaneous emission on fiber laser amplifier chain

“…2(b). These phenomena were also observed in previous studies [3], [8]. Considering a typical ytterbium-doped fiber amplifier with 2-m long under 1-W pump power, a shorter fiber was chose for avoiding Raman effect [10] and typical pump power of commercial device for preamplifier.…”

Blue and near-infrared up-conversion in double-air-cladding Tm3+-doped silica fiber under 1064 nm excitation

“…-doped fibers have recently attracted much interest due to their potential application in material processing, laser sensing, free-space optical communication, and bio-medical (Modsching et al 2011;Creeden et al 2014;Tang et al 2010;Zhang et al 2005a;Liu et al 2013;He et al 2013). Lots of studies have been demonstrated to obtain high power fiber laser (Goodno et al 2009;Schellhorn et al 2009; http://www.laserfocusworld.com/articles/ print/volume-48/issue-08/features/holmium-doped-silica-fiber-designs-extend-fiber-lasersbeyond-2-um.html) or pumped light source for generating the longer laser wavelength with Ho 3?…”

Temporal characteristics of gain-switched thulium-doped fiber laser near threshold

“…Furthermore, the gain-switching technique has its own advantages, including the simplicity in operation and extreme flexibility in pulse repetition rate and width tuning [10], while the Qswitching technique is typically limited by low repetition rate or pulse width in addition to the need for the bulk Q-switching device [11]. Recently, the gain-switching technique has been successfully adopted to obtain 2 μm pulses reported in lots of literature [12][13][14]. However, when these gain-switched TDFLs are pumped around 790 nm or 1 μm, the output pulses consist of a series of unstable chaotic relaxation spikes as the result of the long relaxation time (>10 μs) from the pump energy level to the laser emission 2 μm band [12,13].…”