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Stark effects in optically pumped CH3OH far infrared laser

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Abstract

The Stark tuning properties of the 118.8-μm CH3OH FIR laser line pumped by the P(36) 9.4-μm CO2 laser line are investigated. A laser model using a rate equation approach is derived. Observed Stark tuning effects include (1) frequency shifting of CH3OH absorption line, (2) frequency shifting of the FIR laser line, and (3) amplitude modulation of the FIR laser output. Frequency shifting of the CH3OH absorption line closer to the CO2 pump laser line center results in a Stark enhancement of the 118.8-μm FIR laser line by a factor of 3 with a Stark field of 180 V/cm. Frequency shifting of about 7 MHz of the 118.8-μm FIR laser line is observed with a Stark field of 362 V/cm. Amplitude modulation characteristics of the FIR laser output are observed to be similar to those for Stark absorption modulation.

© 1979 Optical Society of America

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