Low-frequency wavelength modulation spectroscopy with D-2 transition of atomic cesium by use of an external-cavity diode laser

Low-frequency wavelength modulation spectroscopy is acquired with an extern al-cavity diode laser. The wavelength modulation is achieved with voltage t uning by means of scanning with the piezoelectric stepper motor, which rota tes the end mirror in the laser cavity. With optimum 1-kHz frequency modula tion and harmonic detection, direct absorption experiments for the 6S(1/2)( F = 4) --> 6P(3/2) transition of the cesium D-2 line were carried out. We f ound that 6f-harmonic detection is best here with a signal-to-noise voltage ratio of 460. (C) 2000 Optical Society of America.