Stimulated Raman scattering at kHz-pulse-repetition rates. Final report, May 1976-January 1977

Technical Report · Sun May 01 00:00:00 EDT 1977

DOI:https://doi.org/10.2172/6462514· OSTI ID:6462514

Ammann, E. O.

This report summarizes the results of an eight-month program whose goal was to study stimulated Raman scatterng (SRS) in crystals at kHz pulse repetition rates. SRS at high pulse repetition rates is of interest because: (1) it opens the way for achievement of substantial average output powers from Raman oscillators, and (2) it provides a more controllable, convenient experimental situation for further SRS investigations. On this program, we have focused our efforts on crystals having Raman modes in the 823 cm/sup -1/ (12.15-..mu..m) and 628 cm/sup -1/(15.92-..mu..m) regions of the spectrum. Most of our work has centered on a Raman oscillator consisting of a lithium iodate (LiIO/sub 3/) crystal that is pumped by a 1.08-..mu..m Nd:YAlO/sub 3/ laser. Two different configurations of the Raman oscillator were studied; both configurations have the LiIO/sub 3/ crystal located inside the pumping laser. The first configuration, which we term the three-mirror configuration, uses separate mirrors for the laser and Stokes resonators. This configuration has produced 900 mW of 1.18-..mu..m 1st Stokes output and 200 mW of 1.31-..mu..m 2nd Stokes output from LiIO/sub 3/. In the second configuration, termed the two-mirror configuration, the laser and Stokes lines share the same two mirrors. The two-mirror configuration has produced 1.25 watts output at 1.18-..mu..m and 550 mW at 1.31-..mu..m. Experiments have also been carried out on selectivity exciting SRS in LiIO/sub 3/ and on modelocked operation of a LiIO/sub 3/ Raman oscillator. Finally, preliminary SRS experiments were carried out on the 628 cm/sup -1/ mode in LiNbO/sub 3/. In these early experiments, the SRS was weak and difficult to maintain. Several factors have been identified which are likely responsible for the relatively poor SRS performance of LiNbO/sub 3/.

• Research Organization: GTE Sylvania, Inc., Mountain View, CA (USA). Electronic Systems Group-West
• DOE Contract Number: AC03-76SF90024
• OSTI ID: 6462514
• Report Number(s): DOE/SF/90024-T1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
IODATES
RAMAN SPECTRA
LITHIUM COMPOUNDS
NIOBATES
CRYSTAL LATTICES
LASER SPECTROSCOPY
NEODYMIUM LASERS
OPTICAL PUMPING
RAMAN EFFECT
SCATTERING
ALKALI METAL COMPOUNDS
CRYSTAL STRUCTURE
HALOGEN COMPOUNDS
IODINE COMPOUNDS
LASERS
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PUMPING
SOLID STATE LASERS
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
360602 - Other Materials- Structure & Phase Studies