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Optics Letters


  • Vol. 21, Iss. 13 — Jul. 1, 1996
  • pp: 1000–1002

Sub-Doppler optical frequency reference at 1.064 μm by means of ultrasensitive cavity-enhanced frequency modulation spectroscopy of a C2HD overtone transition

Jun Ye, Long-Sheng Ma, and John L. Hall  »View Author Affiliations

Optics Letters, Vol. 21, Issue 13, pp. 1000-1002 (1996)

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Using our cavity-enhanced frequency modulation technique, we obtained the saturated signal of the weakly absorbing gas C2HD for the P(5) line of the (ν2 + 3ν3) overtone band at 1.064 μm. An absorption sensitivity of 1.2 × 10−10 (1.8 × 10−12/cm) has been obtained. The absolute frequency of the line center is established (within ±2.6 kHz) with respect to a doubled Nd:YAG laser/I2 frequency reference. The short-term stability, limited by the available signal-to-noise ratio, currently is 1 × 10−11 at 1 s, improving to 5 × 10−13 at 1000 s. The measured pressure-broadening rate is 34.7(0.8) kHz/mTorr (260 ± 6.1 kHz/Pa). Selection of slow molecules gave a linewidth four times narrower than the room-temperature transit-time limit.

© 1996 Optical Society of America

Original Manuscript: February 26, 1996
Published: July 1, 1996

Jun Ye, Long-Sheng Ma, and John L. Hall, "Sub-Doppler optical frequency reference at 1.064 μm by means of ultrasensitive cavity-enhanced frequency modulation spectroscopy of a C2HD overtone transition," Opt. Lett. 21, 1000-1002 (1996)

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