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Instability in a CO2 sequence-band laser with a saturable absorber and vibration-to-vibration energy transfer processes

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Abstract

Several types of instability are observed in the passive Q-switching (PQS) pulsation of a CO2 sequence-band laser with a saturable absorber. The observed pulse shapes are different from those of a regular-band CO2 laser in detailed structure. We propose a novel model for the PQS instability of a CO2 sequence-band laser by considering two vibration-to-vibration energy-transfer processes. We find that the sequence-band PQS pulse width critically depends on the rate of vibrational relaxation in the ν3 mode. The vibration-to-vibration relaxation rate is estimated from the analysis of the pulse shapes.

© 1993 Optical Society of America

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