MIDIT OFD CATS Modelling, Nonlinear Dynamics Optics and Fluid Dynamics Chaos and Turbulence Studies and Irreversible Thermodynamics Risø National Laboratory Niels Bohr Institute and Technical University of Denmark Building 128 Department of Chemistry Building 321 P.O. Box 49 University of Copenhagen DK-2800 Lyngby DK-4000 Roskilde DK-2100 Copenhagen Ø Denmark Denmark Denmark
by Nikola Nikolov
Dept. of Informatics and Mathematical Modelling (IMM)
Technical University of Denmark (DTU)
Richard Petersens Plads, Building 321
DK-2800 Kongens Lyngby, Denmark
Thursday, March 1, 2001, 14.00 h
at IMM, Bldg. 305, Room 018, DTU
Abstract: A new method using frequency doubling polarisation mirror (FDPM), for passive mode-locking and Q-switching of high power lasers have been proposed. The new technique is based on the intensity dependent reflection of the FDPM, which is due to the polarisation rotation of the fundamental wave in a nonlinear crystal for second type (type II) second harmonic generation (SHG). The dependence of the properties of the FDPM on the nonlinear charecteristics and the otientation of the nonlinear crystal, as well as on the accumulated phase shift between the second harmonic and the fundamental wave within the space between the nonlinear crystal and the back reflector were investigated. Dynamics of the generation evolution in laser with FDPM, using rate equations has been analized. This new method has a very large spectral range, and the lack of absorption losses make it appropriate for passive Q-switching of high evarage power lasers.