Diode-pumped high efficient Tm:YLF laser output at 1908 nm with near-diffraction limited beam quality

Abstract

High power and high beam quality continuous wave Tm:YLF laser by the dual-end-pumped is presented in this letter. The highest output power reaches 21.3 W when the totally input pump power is 54.6 W. The optical conversion efficiency is 39.0% and the slope efficiency is 47.3%. With an F-P etalon in the cavity, the output center wavelength is tuned to 1908 nm with about 0.5 nm FWHM. With the optimal cavity, the beam quality factor M 2 can be ∼ 1.1. As we know, our work is the first time to investigate the Tm:YLF laser output spectrum with an F-P etalon in the cavity, and acquire near-diffraction limited laser output. Output power, W 25 20 15 10 5 0 60 50 40 30 20 10 0 Incident pumped power, W

CW single transverse mode all-fiber Tm3+-doped silica fiber laser

“…High power lasers at 1.9 µm region are very attrac tive for their applications in medical and surgery [1][2][3][4][5][6], and infrared guided missile countermeasure [7][8][9][10]. Another application is to pump Ho 3+ doped crys tal to generate 2.1 µm laser with high peak power and high repetition frequency [11], which can be used to pump ZnGeP 2 OPO to generate 3-5 µm crucial mid infrared countermeasure sources [12,13].…”

High efficiency Tm3+ fiber laser of seed amplification

“…High power lasers at 1.9 m region are very attractive for their applications in medical and surgery [1][2][3][4][5][6] and infrared-guided missile countermeasure [7][8][9][10]. Another application is to pump Ho 3+ -doped crystal to generate 2.1 m laser with high peak power and high repetition frequency [11], which can be used to pump ZnGeP 2 OPO to generate 3-5 m crucial mid-infrared countermeasure sources [12,13].…”

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].…”