Abstract

Diode lasers near 670 nm are now commercially available. When cooled to a liquid nitrogen temperature they reach wave- lengths down to 640 nm. A number of interesting atomic resonances fall within this tuning raitge, such as the hydrogen Balmer-α Ene at 656 nm, the Li resonance line at 671 nm, or the Ca intercombination line at 657 nm, which holds promise as a portable optical frequency standard.

© 1990 Optical Society of America