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High power carrier-envelop phase stabilized 1030 nm pulses was generated by amplifying the fractional output spectrum of a passive mode-locked Ti:sapphire laser, exhibited 4.89 mHz long-term frequency fluctuation and 1.9 mHz beat signal linewidth.
High precision OCXO based on SC cut overtone crystals can show very high frequency stability and aging. However, its frequency regulation range by voltage control is not wide. When high precision OCXO is used as the standard of precise controllable measuring instruments, especially the precision slave VCOCXO, in allusion to widen frequency comparison range, the precision OCXO should not only show...
Equivalent phase comparison frequency (EPCF) is an important parameter between two frequency signals, and it shows their phase correlation. It is much higher than anyone of the two frequencies, and its period is equal to the group phase shift corresponding two most adjacent phase coincidences between the signals. For example, to two frequency signals with several MHz frequency, their EPCF can be several...
A simple length vernier approach has been developed which uses the high stability and high speed of signal transmission and the relation of time and space. It can get high resolution, low cost and simple structure. Based on high stable transmission delay of the signal and the coincidence detection technique, the start and stop signals of a measured short time interval are delayed respectively in the...
Because of the development of the frequency standard technique, the higher precision request to the measurement techniques is necessary. For enhancing measurement precision and reducing measurement cost, we developed a time interval measurement technique based on time-space relationship. The high-resolution coincidence detection is very important because it is basic condition for getting high precision...
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