A diffraction grating was used in the Littrow and off-Littrow configurations to select the lines in a cw HF stable resonator. The beam is outcoupled through a partially reflective mirror. Single line Littrow, single line off- Littrow, and off-Littrow line pair performance were measured. For the first time, as far as we know, in the operation of chemical lasers, Littrow and off-Littrow lines lased simultaneously. Two line (one Littrow line, one off-Littrow line) and three line (one Littrow line, two off-Littrow lines) Littrow/off-Littrow line combinations were demonstrated. The grating reflectivity was a strong function of the polarization of the laser beam. Data indicated that the grating generated a beam whose polarization was perpendicular to the grating grooves.

Date Published: 4 April 1997
PDF: 4 pages
Proc. SPIE 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (4 April 1997); doi: 10.1117/12.270117

Published in SPIE Proceedings Vol. 3092:
XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference
Denis R. Hall; Howard J. Baker, Editor(s)