Low phase noise diode laser oscillator for 1S-2S spectroscopy in atomic hydrogen.
Low phase noise diode laser oscillator for 1S-2S spectroscopy in atomic hydrogen.
复制标题
用于原子氢 1S-2S 光谱的低相位噪声二极管激光振荡器。
DOI：
10.1364/ol.36.004299
复制
发表时间：
2011
期刊：
影响因子：
3.6
通讯作者：
T. Hänsch
中科院分区：
文献类型：
--
作者：
N. Kolachevsky;J. Alnis;C. Parthey;A. Matveev;R. Landig;T. Hänsch
本文报道了一种972 nm的低噪声半导体激光振荡器，该振荡器采用振动和热补偿的超稳参考腔主动稳频。为了增加激光功率在载波中的比例，我们设计了一个20厘米长的外腔二极管激光器，带有腔内电光调制器。载波中的分数功率达到99.9%，相当于10 MHz带宽下的均方根相位噪声φ（rms）2=1 mrad 2。利用该振荡器，我们记录了氢原子的1 S-2S光谱，并且在三个连续的双光子过程中没有观察到由于相位噪声倍增而导致的激发效率的任何显著损失。
We report on a low-noise diode laser oscillator at 972 nm actively stabilized to an ultrastable vibrationally and thermally compensated reference cavity. To increase the fraction of laser power in the carrier we designed a 20 cm long external cavity diode laser with an intracavity electro-optical modulator. The fractional power in the carrier reaches 99.9%, which corresponds to an rms phase noise of φ(rms)2=1 mrad2 in 10 MHz bandwidth. Using this oscillator, we recorded 1S-2S spectra in atomic hydrogen and have not observed any significant loss of the excitation efficiency due to phase noise multiplication in the three consecutive two-photon processes.