Optical-to-Microwave Frequency Chain Utilizing a Two-Laser-Based Optical Parametric Oscillator Network,
MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
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A method for building an optical to microwave frequency chain and for measuring optical frequencies relative to the cesium primary frequency standard is described. Based on optical frequency division via parametric oscillators, the concept is to generate two known ratios 12 and 49 of an optical calibration frequency f1 whose frequency difference is measured relative to the cesium clock. The 12 ratio is obtained by either a 21 frequency division of f1 or second-harmonic generation of 12 f1. The 49 ratio of f1 can be generated with a 31 frequency divider driven by a second laser at f2 that is chosen to be near 23f1, which in turn is obtained with a f1-pumped 31 frequency divider. A set of auxiliary Optical Parametric Oscillators OPOs with outputs centered at 12fi is used to facilitate the difference-frequency measurement between the two ratios. A practical configuration utilizing a YAG and a Ti A12O3 laser and its application to a number of precision measurements of interest are presented.
- Electrooptical and Optoelectronic Devices