Frequency control of a CO(2) laser using stark cell stabilization
Brown, Daniel Morris
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Preliminary studies have been carried out for the frequency and intensity stabilization of the output of a Sylvania Model 941 Carbon Dioxide laser, by feedback control of resonator length. Fluctuations due to discharge current and temperature and flow rate of coolant were studied. Current regulation of the power supply was found to be necessary for intensity stability. Cavity length tuning allowed vibration-rotation line selection, with a strong hysteresis effect. A computer analysis of error signal production for a pyroelectric detector and for a HgCdTe detector indicated that phase sensitive detection of the first harmonic signal component gave the typical frequency discriminant. Operation of a servo loop integrator for the feedback loop has been considered. A suitable Stark Effect absorption cell for feedback signal generation has been constructed, but has not been applied to the laser.
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