Analysis of frequency noise in ultra-stable optical oscillators with active control of residual amplitude modulation

被引：14
|
作者：
Li, Liufeng [1 ,2 ,3 ]
Shen, Hui [1 ,4 ]
Bi, Jin [1 ,4 ]
Wang, Chun [1 ,4 ]
Lv, Shasha [1 ,4 ]
Chen, Lisheng [1 ,2 ,3 ,4 ]
机构：
[1] Chinese Acad Sci, Wuhan Inst Phys & Math, Wuhan 430071, Peoples R China
[2] State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
[3] Chinese Acad Sci, Lab Atom Frequency Stand, Wuhan 430071, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2014年 / 117卷 / 04期
基金：
美国国家科学基金会;
关键词：
LASER STABILIZATION; NARROW-LINEWIDTH; REFERENCE CAVITY; PHASE; SPECTROSCOPY; CLOCK; BAND; ND; REDUCTION; STABILITY;
D O I：
10.1007/s00340-014-5923-x
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Two 1,064-nm Nd:YAG lasers frequency stabilized by high-finesse optical cavities are developed to investigate various noise mechanisms in ultra-stable optical oscillators. Active control of residual amplitude modulation using a separate sensing path is implemented and its effectiveness in the presence of a resonant optical cavity is theoretically analyzed and experimentally verified by measuring the rejection ratios in optical heterodyne beat between a perturbed laser and a stable reference. Laser frequency noises originated from vibration, residual amplitude modulation, quantum-limited shot noise, and electronic noise are experimentally analyzed. With active control, residual amplitude modulation is suppressed to below 1 x 10(-6) at 0.02-1,000 s, reaching a minimum of 2 x 10(-7) at similar to 2 s. A frequency stability of 2 x 10(-15) is obtained from 0.1 to 10 s, and the optical heterodyne beat of the two Nd: YAG lasers shows 1-Hz linewidth with a measurement time of 4.096 s. In addition, the experimentally determined linewidths agree well with the calculation according to a simplified relationship between the linewidth and the underlying flicker noise that modulates the laser frequency.
引用
收藏
页码：1025 / 1033
页数：9
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