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Doppler-Free Optogalvanic Spectroscopy of Ca+ and Ca

The high-resolution Doppler-free optogalvanic spectra of Ca+ and Ca were observed using a commercial hollow-cathode lamp and a single-mode cw ring Ti:sapphire laser or a dye laser. The measured full width at half-intensity-maximum (FWHM) of the Ca+ Doppler-free component was 167 MHz, which is sufficient for calibrating the wavelength for the laser cooling of Ca+ ions. The amount of collision broadening in the Ca+ spectrum was much greater than that in the Ca spectrum.