Title :
Optical heterodyne spectroscopy enhanced by an external optical cavity: toward improved working standards
Author :
Ma, L.-S. ; Hall, J.L.
Author_Institution :
Dept. of Phys., East China Normal Univ., Shanghai, China
fDate :
11/1/1990 12:00:00 AM
Abstract :
A study is made of the use of an external resonator to enhance sub-Doppler signals observable with the high-sensitivity techniques of optical heterodyne spectroscopy. The case of modulation-transfer spectroscopy in a ring resonator is considered in detail. Exciting the 127I2 resonance at 612 nm with a low-power He-Ne laser made it possible to observe a S/N of 250:1 in a 10-kHz bandwidth. Used in an optimal control loop, this performance would provide a laser stability of 10 Hz at 1 s. Such a greater-than-hundredfold improvement in stability should lead to increases in accuracy as well
Keywords :
laser beam applications; laser frequency stability; measurement standards; optical resonators; optical transfer function; spectrometer components and accessories; spectroscopy; 10 Hz; 612 nm; 127I2 resonance; external optical cavity; external resonator; high-sensitivity techniques; laser stability; low power He-Ne laser; modulation-transfer spectroscopy; optical heterodyne spectroscopy; optimal control loop; ring resonator; sub-Doppler signals; working standards; Bandwidth; Laser stability; Optical mixing; Optical modulation; Optical resonators; Optical ring resonators; Optimal control; Resonance; Ring lasers; Spectroscopy;
Journal_Title :
Quantum Electronics, IEEE Journal of
