Lamb-dip stabilized 543-nm He-Ne lasers and isotope shift of Ne 3s(2) -> 2p(10) transition

Internal-mirror 543-nm He-Ne-20 and He-Ne-22 lasers are frequency-stabilize d to the Lamb-dip of their tuning curves. Frequency stability of 2 x 10(-11 ) and frequency resettability of 4 x 10(-9) (or 2 MHz) are achieved. The ab solute frequencies of the two lasers are determined by frequency-comparing with an iodine-stabilized 543-nm laser. The isotope shift between Ne-20 and Ne-22 is measured to one order of magnitude more accurately than the previ ous result, and the specific-mass-shift for Ne 3s(2) --> 2p(10) transition is also determined.