Accession Number : ADD008785

Title :   Optical Oscillator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Ferguson,Gerald D

Report Date : 30 Jun 1981

Pagination or Media Count : 9

Abstract : Disclosed is a laser device for generating a high power output in a pulse transmission mode. The laser corrects for thermally induced birefringence losses. A flashlamp is actuated to cause an atomic population inversion in an adjacent laser rod. Thereafter, population inversion in the rod is decreased and the laser intra-cavity optical field increased by a linear resonator. This resonator includes a mirror, the laser rod in a cavity generating a single laser beam, a birefringent crystal converting the single beam into a pair of beams each having a different polarity and vice versa on return, a half-wave plate placing the polarization of one of the beams in correspondence with that of the other beam, and a reflecting polarizer reflecting only that polarization through a Q-switch such as a Pockel's cell, inactivated, and to a second mirror. The second mirror reflects the pair of beams back through the switch and to the polarizer, from which they return to the birefringent crystal and laser rod. Thus, no part of any beam is lost during resonation due to birefringent effects. After sufficient time has been allowed for the laser optical field to reach a desired maximum level, bias voltage is provided to activate the Pockel's cell, causing the pair of beams returning therefrom to the reflecting polarizer to have a polarization which is passed through the polarizer as an output.

Descriptors :   *Patents, *Pulsed lasers, *Q switching, *Laser cavities, *Pockels cells, Optical pumping, Losses, Laser cavities, Laser beams, Heat, Low loss, Reflection, Optical equipment, Beams(Radiation), Polarizers, Voltage, Pulses, Models, Bias, Transmittance, Population, Birefringence, Rods, Inversion, resonators, Crystals, Oscillators, Lasers

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE