Graduate School in Nonlinear Science

Sponsored by The Danish Research Agency




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



NUMMERICAL MODELLING OF THE CONTROL OF LASER LIGHT
BY A FREQUENCY DOUBLING POLARISATION MIRROR

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.