Diode-pumped passively Q-switched Nd:GAGG laser at 938 nm with V3+:YAG saturable absorber

Abstract

The continuous wave (CW) and passively Qswitched Nd:Gd3AlxGa5−xO12 (Nd:GAGG) laser operation at 938 nm have been realized for the first time. The maximum CW output power of 0.44 W was obtained under the absorbed pump power of 8.54 W, corresponding to the slope efficiency of 7.8% and optical-to-optical efficiency of 5.2% respectively. A V 3+ :YAG saturable absorber crystal with the initial transmission of 97% was used for the passive Q-switching regime. The maximum average output power of 0.19 W was achieved with the minimum pulse width of 358 ns and Q-switched repetition rate of 116 kHz. The corresponding single pulse energy and pulse peak power were determined to be 1.6 μJ and 4.6 W, respectively.

Diode-pumped high-repetition-rate acousto-optically Q-switched Nd:YVO4 laser operating at 914 nm

“…In 2005, Zhang presented the pulsed 946 nm Nd:YAG laser using a co doped Nd, Cr:YAG as saturable absorber, and the maximum average out put power of 2.1 W was achieved with a pulse width of 40.8 ns at a repetition rate of 80 kHz [17]. In addition, passive Q switched 935 nm Nd:CNGG laser, 938 nm Nd:GAGG laser and 912 nm Nd:GdVO 4 laser were also investigated [18][19][20]. By means of the A-O Q switch, our group had demonstrated a pulsed 912 nm Nd:GdVO 4 laser in 2008, with a minimum pulse width of 20 ns and a maximum peak power of 7.1 W at 10 kHz, and pulsed blue laser was also obtained by int racavity frequency doubling [21,22].…”

Diode-pumped passively mode-locked Nd:GYSGG laser

“…The disordered nature of the disordered crystal causes an inhomogeneous broadening of their emission spectra, which is beneficial to generating ultrashort pulses. Recently, continuous-wave (CW), passively Q-switched, and mode-locked operation of the disordered crystals, such as Nd:CNGG [10][11][12][13][14], Nd:CLNGG [15][16][17][18], Nd:GAGG [19][20][21] Thirdly, the effective segregation of Nd 3+ in GYSGG is 0.5978, which is larger than that of Nd:YAG (0.1-0.2), and Nd:GYSGG with high Nd 3+ concentration and highoptic uniform can be grown. According to our experience to grown Nd:GYSGG, its crystal diameter can be more than 120 mm, which can be used in high-average laser.…”

Diode-pumped Nd:YGG continuous-wave laser at 1.33 μm

“…Coherent continuous wave light sources have become interesting for many technical applications in medicine, display, and other areas [1][2][3][4][5][6][7][8][9][10][11][12][13]. High effi ciency and compact lasers operating in the 1.3 μm infrared spectral regions have attracted much atten tion for their important applications in spectroscopy, medicine, optical fibers and scientific research [14,15].…”