Accession Number:

ADA252908

Title:

840-Hz Nd:YAG Laser Source of Sodium Resonance Radiation

Descriptive Note:

Final rept. Jan 1989-Mar 1991

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Report Date:

1992-05-11

Pagination or Media Count:

35.0

Abstract:

A 20-W average power laser source of sodium resonance radiation has been developed and delivered to the Air Force Phillips Laboratory to generate a fluorescence spot in the earths mesospheric sodium layer for atmospheric adaptive optics applications. The sodium resonance radiation was generated by sum-frequency mixing 1.06- and 1.32-UM NdYAG laser radiation in a lithium triborate crystal. The pulsed NdYAG lasers operated with a repetition rate of 840 Hz and pulse lengths of about 100 us. The sum radiation was resonant with the sodium D 2 transition and generated with an average mixing efficiency of 30. The lasers were mode-locked with a controlled pulse width that provided a spectrally broadened output matched to the 3-GHz Doppler-broadened absorption width of mesospheric sodium. Nd YAG lasers, sodium resonance radiation, sum- frequency mixing, mesospheric sodium, lithium triborate, adaptive optics.

Subject Categories:

  • Atmospheric Physics
  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE