Narrow linewidth continuous wave diode-pumped Tm:YLF laser with a volume Bragg grating

Abstract

Abstract:We report a diode-pumped CW Tm:YLF laser at room temperature with a volume Bragg grating (VBG) instead of the conventional mirror. The Tm:YLF laser operated at 1909.5 nm with output power 6.0 W. The optical-to-optical conversion efficiency is 25.7% and slope efficiency is 37.4%. Also, a stable output and a narrow linewidth less than 0.3 nm FWHM are achieved.

High power single-longitudinal-mode Nd:YAG CW laser using reflective volume Bragg grating as output coupler

“…This approach is based on intra cavity mode selection which is Volume Bragg Gratings (VBG) recorded in Photo Thermo Refractive (PTR) glass [20]. The use of RVBG as out put coupler for CW and pulsed solid state and semi conductor lasers has shown the unique characteristics, of which the narrowing and stabilization of laser spec tra occurs without output power loss [21][22][23][24][25][26]. In our experiment, a single SLM structure has been estab lished using RVBG instead of common mirror.…”

High-power and efficiency continuous-wave operation of a-cut Ho:YAP laser at room temperature

“…Tm,Ho:YAP lasers with high power and high effi ciency were demonstrated in recent years [6][7][8], but they must be cooled to lower temperature suffering from more high up conversion effects and energy transferring between Tm and Ho. With the develop ment of 1.9 µm laser as an efficient pump source [9,10], resonantly pumped Ho lasers have the advantage of creating very low quantum defect heating and become prominent in these applications. High effi ciency Ho lasers based on several hosts such as LiYF 4 (YLF), Y 3 Al 5 O 12 (YAG), and Lu 3 Al 5 O 12 (LuAG) have been reported [11][12][13][14].…”

Q-switched operation of a-cut Ho:YAlO3 laser pumped by a diode-pumped 1.91 μm thulium laser

“…The rare earth ions thulium and holmium co doping materials [4] are commonly employed to obtain the 2 µm laser, however, they need to operate at 77 K [5][6][7] in order to achieve a high performance. With the development of 1.9 µm laser as an efficient pump source [8,9], resonantly pumped Ho lasers [10][11][12][13] become prominent in these applications. Compared with other Ho doped materials, the broad absorption band of Ho:YAP with multiple intense peaks around 1.9 µm makes it easy for Tm doped laser pumping [14][15][16].…”