通过C(2)HD泛音跃迁的超灵敏腔增强频率调制光谱法实现1.064微米的亚多普勒光学频率参考。

Sub-Doppler optical frequency reference at 1.064 microm by means of ultrasensitive cavity-enhanced frequency modulation spectroscopy of a C(2)HD overtone transition.

作者信息

Ye J, Ma L S, Hall J L

出版信息

Opt Lett. 1996 Jul 1;21(13):1000-2. doi: 10.1364/ol.21.001000.

DOI:10.1364/ol.21.001000

PMID:19876231

Abstract

Using our cavity-enhanced frequency modulation technique, we obtained the saturated signal of the weakly absorbing gas C(2)HD for the P(5) line of the (nu(2) + 3nu(3)) overtone band at 1.064 microm. An absorption sensitivity of 1.2 x 10(-10) (1.8 x 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/I(2) 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 x 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.

摘要

利用我们的腔增强调频技术，我们在1.064微米处获得了弱吸收气体C₂HD在（ν₂ + 3ν₃）泛频带P(5)线的饱和信号。吸收灵敏度达到了1.2×10⁻¹⁰（1.8×10⁻¹²/cm）。相对于倍频Nd:YAG激光/I₂频率参考，确定了谱线中心的绝对频率（在±2.6千赫兹范围内）。目前，受可用信噪比限制，短期稳定性在1秒时为1 + 10⁻¹¹，在1000秒时提高到5×10⁻¹³。测得的压力展宽率为34.7(0.8)千赫兹/毫托（260±6.1千赫兹/帕）。选择慢速分子使线宽比室温下的渡越时间限制窄四倍。