Investigation of Spectral and Statistical Properties of Single-Mode CW Lasers.
Final rept. 1 Jul 69-30 Jun 70,
CALIFORNIA UNIV IRVINE SCHOOL OF ENGINEERING
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Variance and power spectrum of intensity fluctuations of a single mode CW CO2 10.6 micron gas laser have been measured by using a copper-doped Germanium detector and analog instrumentation. RMS intensity fluctuations above the oscillation threshold was smaller than 0.3 of the average intensity. The measurements near the oscillation threshold, however, were not accurate, because the acoustic disturbance due to acoustical noise, bubbles in the cooling water and temperature fluctuations in the plasma tube were preodiminant over the fluctuations due to spontaneous emission. The power spectrum observed at frequencies above 10KHz showed features characteristic to the laser model of Van der Pol oscillator driven by the random noise. Improvements of CO2 gas laser desirable for further investigation are discussed. Author
- Lasers and Masers