High power widely tunable Tm:fiber laser with spectral linewidth of 10 pm

Abstract

We report on high-power, efficient operation of a widely tunable, cladding pumped Tm:fiber laser using a volume Bragg grating (VBG) for wavelength selection and spectral narrowing. The operating wavelength was tunable from 1943 to 1998 nm, with > 53 W output power over a tuning range of 50 nm from 1948 nm to 1998 nm and a spectral linewidth of 10 pm. Over 58.1 W of diffraction limited (M 2 ∼ 1.5) CW output power was generated for 143.6 W of launched pump power at 792 nm, corresponding to a slope efficiency with respect to launched pump power of 45%.Intensity, a.u. 0.5 1.0

High-power 2.1 μm Ho:Lu1.5Y1.5Al5O12 laser in-band pumped by a Tm fiber laser

“…Wavelength tuning and spectrum narrowing was realized employing a volume Bragg grating (VBG) of 1912 nm center wavelength and > 99% diffraction efficiency [25,26]. Operating wavelength of the Tm:fiber laser was tuned to match the absorption peak of Ho:LuYAG at ∼ 1907 nm (see Fig.…”

All-fiber widely wavelength-tunable thulium-doped fiber ring laser incorporating a Fabry-Perot filter

“…In all these applications, broad wavelength tun ability is extremely beneficial and desirable. However, due to the lack of fiber optical components in the 2 µm range, bulk devices and free space designs were required in previous demonstrations [12][13][14], making the system complex and increasing the difficulties of daily maintenance. On the other hand, all fiber lasers have been widely employed both in the telecommuni cation [15][16][17][18] and mid infrared [19,20] wavelength range, because they possess many advantages over their rivals, such as compactness, great reliability and low cost.…”

Tunable passively Q-switched thulium-doped fiber laser operating at 1.9 μm using arrayed waveguide grating (AWG)

“…In addition, tunability of basic TDF lasers in the 2.0 mm wavelength region has already been widely demonstrated by using volume Bragg gratings (VBGs) [29][30][31], and also by the use of diffraction gratings [18,32]. However, these methods are quite complex due to the use of bulky optic components in the laser cavity.…”