Abstract

Thin-film PbTe diode lasers are used for Doppler-limited Stark spectroscopy on the vibration-rotation ν₄ band of 1545–1595-cm⁻¹ region. The lasers operate cw below 20 K and are frequency tuned by varying the diode current. The ν₄ excited state dipole moment of NH₃ is found to be about 1% less than the ground state value.

© 1974 Optical Society of America

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