| Autor: |
Er Jun Zang, Jian Ping Cao, Ye Li, Cheng Yang Li, Yong Kai Deng, Chun Qing Gao |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Instrumentation & Measurement; Apr2007, Vol. 56 Issue 2, p673-676, 4p, 3 Black and White Photographs, 1 Diagram, 4 Graphs |
| Abstrakt: |
Several innovations have been adopted in our portable 532-nm optical frequency standard. Particularly, we realized a four-pass scheme equivalent to 1.8-m I2 absorption length, which gives adequate signal-to-noise ratio (∼170 in a 10-kHz bandwidth). In addition, an active feedback control has been designed and implemented. The fluctuations of the residual-amplitude modulation in the electrooptic modulator have been successfully suppressed. As a result, the laser-frequency stability is greatly improved. When both lasers are locked on the same molecular iodine transition line of R (56) 32-0: α10, the Allan deviation is lower than 2.3 × 10-14 at 1-s averaging time, reaching the flicker floor at about 4 × 10-15 after 200 s. The maximum frequency excursion at 532 nm is about 175 Hz during a continuous measuring time of 150 000 s. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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