Stark-Effect Modulation of a CO2 Laser by NH2 D

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Abstract
The molecular Stark effect in NH2D was used to modulate the 10. 6‐μ P(20) line of a CO2 laser yielding a modulation depth of 40% from a 200‐V cm−1 rms signal applied to a 19. 7‐cm gas cell external to the laser. NH2D was prepared by mixing ND3 and NH3. The absorption coefficient of the M=4 Stark‐split line was measured as a function of mixing ratio and pressure. The observed pressure‐broadening coefficient was 32. 5 MHz/Torr.