Baumann Esther, Giorgetta Fabrizio R, Nicholson Jeffrey W, Swann William C, Coddington Ian, Newbury Nathan R
National Institute of Standards and Technology, Boulder, CO 80305, USA.
Opt Lett. 2009 Mar 1;34(5):638-40. doi: 10.1364/ol.34.000638.
We demonstrate an environmentally robust optical frequency comb based on a polarization-maintaining, all-fiber, figure-eight laser. The comb is phase locked to a cavity-stabilized cw laser by use of an intracavity electro-optic phase modulator yielding 1.6 MHz feedback bandwidth. This high bandwidth provides close to shot-noise-limited residual phase noise between the comb and cw reference laser of -94 dBc/Hz from 20 Hz to 200 kHz and an integrated in-loop phase noise of 32 mrad from 1 Hz to 1 MHz. Moreover, the comb remains phase locked under significant mechanical vibrations of over 1 g. This level of environmental robustness is an important step toward a fieldable fiber frequency comb.
我们展示了一种基于保偏全光纤八字形激光器的环境适应性强的光学频率梳。通过使用腔内电光相位调制器，该频率梳被锁相到一个腔稳定连续波激光器，产生1.6兆赫兹的反馈带宽。这种高带宽在20赫兹至200千赫兹范围内，使频率梳与连续波参考激光器之间的残余相位噪声接近散粒噪声极限，达到-94分贝/赫兹，并且在1赫兹至1兆赫兹范围内的环路内积分相位噪声为32毫弧度。此外，在超过1克的显著机械振动下，该频率梳仍能保持锁相。这种环境适应性水平是迈向可部署光纤频率梳的重要一步。
