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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