Accession Number : AD0635399

Title :   TECHNIQUES FOR SUPER-MODE OSCILLATION.

Descriptive Note : Interim engineering rept. no. 4, 1 Mar-31 May 66.

Corporate Author : ELECTRONIC DEFENSE LABS SYLVANIA ELECTRONIC SYSTEMS-WEST MOUNTAIN VIEW CALIF

Personal Author(s) : Targ,Russell

Report Date : 31 MAY 1966

Pagination or Media Count : 34

Abstract : By means of a frequency selective coupler, more than 50 percent of the multimode power of a He-Ne laser was obtained at a single frequency. The amplitude stability of this single-frequency output was strongly dependent on the behavior of the power stabilization system used to control the positions of the laser mirrors. 28 mw of single-frequency light was obtained from a 50 mw He-Ne laser using the stabilization system described in the previous report. One of the limitations on the use of the super-mode technique is the very high peak-phase deviation ratio (T) that results from the operation of high-power FM lasers. Recently we have been able to operate an FM He-Ne laser with an internal phase perturbation driven at twice the axial mode interval of the laser cavity. The result of this 2(c/2L) excitation is an FM laser with approximately half the usual number of driven modes and thus half the modulation index to be un-modulated by the super-mode modulator. The preliminary design for the control system to absolutely stabilize the frequency of the FM laser has been completed.

Descriptors :   (*LASERS, FREQUENCY MODULATION), OPTICS, MONOCHROMATIC LIGHT, MIRRORS, SERVOMECHANISMS, PHASE LOCKED SYSTEMS, ELECTROOPTICS

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE