Stark-Effect Modulation of a CO2 Laser by NH2 D

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.