Transcript Slajd 1 - Military University of Technology in Warsaw

Military University of Technology
Institute of Optoelectronics
ATu3A.22
Advanced Solid-State Lasers (27 Oct – 1 Nov 2013 – Paris, France)
Paper no.
Room-temperature, efficient, high energy diode-side-pumped Yb:YAG
oscillator
M. Kaskow*, W. Zendzian, J. K. Jabczynski, J. Firak, L. Gorajek, J. Kwiatkowski, K. Kopczynski
Institute of Optoelectronics, Military University of Technology, Warsaw, Poland
*e-mail: [email protected]
Abstract
Free-running operation in a side-pumped Yb:YAG slab laser is reported. For max. available pump
pulse energy of 850 mJ the output pulses with energy of 150 mJ were obtained. The laser system
provides slope efficiency of 26.9% in room-temperature operation.
– Simple, linear resonator
– Yb:YAG slab (4x4x13 mm3, 15%Yb)
– Facets cut under 10 angle
Pulse generation delay vs. pump energy
for different resonator lenghts
Output energy vs. pump energy for
different resonator lengths
Pulse generation delay vs. pump energy
for different Yb:YAG slab
temperatueres
Output energy vs. pump energy for
different Yb:YAG slab temperatures
Output energy vs. pump energy for
different outcoupling transmissions
Summary
Output pulse energy up to 160 mJ was achieved with slope efficiency of 26.9 %.
Relatively high threshold energy (> 250 mJ) can be diminished via optimization of
pump spectrum and caustics sizes, gain element dopant level and cavity
parameters. The efficient operation in the Q-switching and power amplification
regimes seems to be feasible. Lower laser level is populated with approx. 4% of
active ions. For that reason it is crucial to provide best matching between pump
region and fundamental mode of the resonator in order to mitigate reabsorption
losses.
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
www.ioe.wat.edu.pl
This research has been supported by:
– Polish National Science Center
Project No. NCN2012/05/B/ST7/00088
– Polish Ministry of Science and Higher Education
Project No. UMO-2012/06/M/ST/00425