Abstract
We are reporting on major progress in the development of a blue ring dye laser with extreme frequency stability. With improvements of the reference cavity and servo electronics, we have reduced the locking error from a previously reported sub-kHz level to less than 1 Hz. Frequency doubling of this laser will provide narrow bandwidth 243-nm radiation for high precision experiments of the two-photon hydrogen atom 1S-2S transition which has an extremely narrow natural linewidth of 1.3 Hz.
© 1989 Optical Society of America
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