We report experimental and theoretical study of a rotating diode-pumped Nd-YAG ring laser with active beat note stabilization. Our experimental setup is described in the usual Maxwell-Bloch formalism. We analytically derive a stability condition and some frequency response characteristics for the solid-state ring laser gyroscope, illustrating the important role of mode coupling effects on the dynamics of such a device. Experimental data are presented and compared with the theory on the basis of realistic laser parameters, showing a very good agreement. Our results illustrate the duality between the very rich non linear dynamics of the diode-pumped solid-state ring laser (including chaotic behavior) and the possibility to obtain a very stable beat note, resulting in a potentially new kind of rotation sensor.
The highly efficient coupling of light from conventional optical components to optical mode volumes lies in the heart of chip-based micro-devices, which is determined by the phase-matching between propagation constants of fiber taper and the whispering-gallery-mode (WGM) of the resonator. Optical gyroscopes, typically realized as fiber-optic gyroscopes and ring-laser gyroscopes, have been the mainstay in diverse applications such as positioning and inertial sensing. Here, the phase-matching is theoretically analyzed and experimentally verified. We observe Sagnac effect in a millimeter-scale we…
Pulsed Frequency Shifted Feedback Laser for Accurate Long Distance Measurements: Beat Order Determination
对于许多应用来说，远距离测量（10 m - 1000 m）且精度达到10-7是一个挑战。我们表明，这是可以实现的频移反馈（FSF）激光干涉技术，提供的射频拍频顺序的确定作出没有歧义和时间尺度上兼容的大气应用。使用脉冲FSF激光器，我们开发的激光导星应用，我们提出和测试，高达240米，一个简单的方法，用于测量拍阶实时。对动梳模型和Yatsenko模型也进行了讨论。这些模型中的第一个未能解释我们的长距离干涉测量结果。我们表明，长距离测量的精度主要取决于稳定的调制器的声频。
Hänsch-Couillaud locking of a large Sagnac interferometer: advancing below the flicker floor
Physikalisches Institut, Universität Bonn（波恩大学物理研究所）；Research Unit Satellite Geodesy, Technical University of Munich（慕尼黑工业大学卫星大地测量研究组）；School of Physical Sciences, University of Canterbury（坎特伯雷大学物理科学学院）
We report the implementation and performance of a double servo-loop for intensity and phase-difference active stabilization of a dual-frequency vertical external--cavity surface-emitting laser (DF-VECSEL) for coherent population trapping (CPT) of cesium atoms in the framework of compact atomic clocks. In--phase fully correlated pumping of the two laser modes is identified as the best scheme for intensity noise reduction, and an analytical model allows the optimization of the active stabilization strategy. Optical phase-locking the beat-note to a local oscillator leads to a phase noise level be…
Many precision laser applications require active frequency stabilization. However, such stabilization loops operate by pushing noise to frequencies outside their bandwidth, leading to large "servo bumps" that can have deleterious effects for certain applications. The prevailing approach to filtering this noise is to pass the laser through a high finesse optical cavity, which places constraints on the system design. Here, we propose and demonstrate a different approach where a frequency error signal is derived from a beat note between the laser and the light that passes through the reference ca…
