| Autor: |
L.R. Pendrill, U. Karn |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
IEEE Transactions on Instrumentation and Measurement. 42:415-419 |
| ISSN: |
0018-9456 |
| DOI: |
10.1109/19.278594 |
| Popis: |
A practical realization of the unit of length often relies on values of the frequency of optical frequency standards in the form of frequency stabilized lasers. A technique of frequency stabilization commonly used for He-Ne lasers at 633 nm stabilized in frequency to hyperfine spectral components in the saturated absorption spectrum of molecular iodine is that based on phase-sensitive detection at the third harmonic of a modulation frequency. A systematic study is made of how frequency shifts are related to observations of offset voltages in the feedback loop which vary across the iodine spectrum. A simple model based on spectral line shape analysis is found to apply to a variety of lasers possessing moderate offsets. > |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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