Mode Medium Interaction. A Theoretical Study.
Final technical rept. 1 Jul 79-30 Jun 80,
AVCO EVERETT RESEARCH LAB INC EVERETT MA
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An instability in the output of a high-power unstable-resonator cw CO2 laser is analyzed in terms of the perturbative effect of an acoustic wave which is induced by laser heating. The alignment sensitivity of such a laser is also explained in terms of a temperature gradient along the gas-flow direction, which is transverse to the laser axis. We extend our instability analysis to a simple one-dimensional model of a supersonic laser, which we determine to be stable. Finally, we present a new computational technique to determine the intensity distribution and output coupling of the modes of an unstable resonator whose gain is saturated by a variable amount by the flux of the lowest-loss mode. The intensity distribution of this lowest-loss mode is determined self consistently. Author
- Lasers and Masers