Frequency Chirp Of A Low-Pressure Hybrid TE CO[sub]2[/sub] Laser

R. S. Eng; J. G. Grimm; C. Freed; R. G. O'Donnell

doi:10.1117/12.960557

13 September 1989 Frequency Chirp Of A Low-Pressure Hybrid TE CO₂ Laser

R. S. Eng, J. G. Grimm, C. Freed, R. G. O'Donnell

Proceedings Volume 1103, Laser Radar IV; (1989) https://doi.org/10.1117/12.960557
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

The frequency chirp in the output of a hybrid TE CO2 laser has been measured using a heterodyne technique. Due to the low operating pressure of about 35 Torr, laser kinetic and hydrodynamic processes differ considerably in time scale from those in regular TEA CO2 lasers. We have observed that the chirps in laser pulses up to 150 μs long could not be described adequately with existing theories. Almost complete cancellation of the laser chirp was achieved by appropriate use of acousto-optic modulators external to the hybrid TE CO2 laser. The operating and output characteristics of this laser and other parameters related to chirp will be discussed.

Citation Download Citation

R. S. Eng, J. G. Grimm, C. Freed, and R. G. O'Donnell "Frequency Chirp Of A Low-Pressure Hybrid TE CO₂ Laser", Proc. SPIE 1103, Laser Radar IV, (13 September 1989); https://doi.org/10.1117/12.960557

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