PUMP-PROBE SPECTROSCOPY IN POTASSIUM USING AN ALGAAS LASER AND THE 2ND-HARMONIC GENERATION OF AN INGAASP LASER FOR FREQUENCY STABILIZATION AND LINKING

Pump-probe spectroscopy in K-41 by using a grating-feedback 0.77-mum A lGaAs laser and the second-harmonic wave of a 1.54-mum InGaAsP laser f or providing a frequency reference in the 1.5 mum region was performed . The pump laser frequency was locked to the Doppler-free resonance wi th frequency fluctuations less than 50 kHz estimated from the error si gnal. The Doppler-free absorption spectra in both co- and counter-prop agating schemes were obtained, and the feasibility of simultaneous fre quency stabilization and linking for two diode lasers with a frequency difference as large as 200 THz was demonstrated.