FREQUENCY STABILIZATION OF A DIODE-LASER TO DOPPLER-FREE SPECTRUM OF MOLECULAR-IODINE AT 633NM

We report on frequency stabilization of a diode laser to the hyperfine components of the P(33) 6-3 and R(127) 11-5 transitions of molecular iodine at the He-Ne laser wavelength of 633 nm. Single frequency opera tion and wavelength control of the diode laser in a compact form is ob tained by employing weak optical feedback from an integrated microlens . The diode laser driven by an ultra low noise current supply provides nearly shot noise limited detection. A relative frequency stability o f 5 X 10(-12) is achieved at an integration time of 100 s. Harmonic di stortion of the modulated output of the diode laser due to spurious op tical feedback is considered to be the main effect limiting the day-to -day frequency reproducibility of 5 X 10(-11). (C) 1998 Elsevier Scien ce B.V. All rights reserved.