1
Paper no. Military University of Technology Institute of Optoelectronics Advanced Solid-State Lasers (27 Oct – 1 Nov 2013 – Paris, France) ATu3A.30 Polycrystaline Cr 2+ :ZnSe Laser Pumped by Efficient Tm:YLF Oscillator L. Gorajek, J. Jabczynski, M. Kaskow Institute of Optoelectronics, Military University of Technology ,Warsaw, Poland Abstract Efficient high peak power Tm:YLF laser emitting 5.5-mJ pulses of duration about 11ns was presented. Slope efficiency was about 50% according to incident pump power. 3mJ of output energy for Cr:ZnSe laser was achieved. Laser setup Output energy vs. pump energy for free-running Cr:ZnSe laser. Generation spectrum of Cr:ZnSe laser in free- running regime. Microscopic image of Cr:ZnSe polycrystal. Tm:YLF 3.5% 3x10 mm L rez = 120 mm Output coupler: T = 30% R curv = 200 mm Cr:ZnSe polycrystal 2.64 x 6.50 x 7.98 mm N Cr = 2.7 x 10 18 cm -3 L rez = 75 mm Output coupler: T = 3% Dichroic mirror R curv = 200 mm Output power vs. Pump power for free-running Tm:YLF laser. 1 mm Output energy vs. Pump energy for Tm:YLF laser in pulsed regime. Half-megawatt pulse of Tm:YLF laser (energy: 5.5 mJ). Beam quality measurements. Output spectrum of Tm:YLF laser. Cr:ZnSe polycrystal. This research has been supported by: – Foundation for Polish Science – Polish Ministry of Science and Higher Education Project No. Institute of Optoelectronics MUT ul. gen. S. Kaliskiego 2, 00-908 Warsaw, Poland phone: (+48 22) 683 94 30, fax: (+48 22) 666 89 50 Summary • Slope efficiency of Tm:YLF laser was 50% (according to incident pump power. • 5.5 mJ output energy in 11.5 ns pulses corresponds to 0.5 MW of peak power • Nearly diffraction limmited output beam • 3 mJ of output energy in polycrystaline Cr:ZnSe medium Z 2 Z 4 Z 5 f R f = -400 c rez Z D c 05 Faraday isolator Tm :YLF resonator C r:ZnSe resonator
