CO2laser stabilized on narrow saturated absorption resonances of CO2, improved absolute frequency measurements

Autor:	V. Bernard, G. Nogues, L. F. Constantin, Ch. Chardonnet, Ch. Daussy
Rok vydání:	1997
Předmět:	Co2 laser Materials science Optics Terahertz radiation business.industry Absolute frequency General Engineering Absorption (electromagnetic radiation) business Beam (structure) Line (formation)
Zdroj:	Metrologia. 34:313-318
ISSN:	1681-7575 0026-1394
Popis:	We have stabilized a CO2 laser on narrow saturated absorption resonances of CO2 detected on the transmitted beam of an external Fabry-Perot cavity in the 30 THz spectral region. By using another CO2 laser stabilized on a close OsO4 line whose absolute frequency is precisely known, and measuring the beat frequency 4 with a precision of 100 Hz, we determined the absolute frequency of twenty CO2 laser lines, with uncertainties between 100 Hz and 1 kHz mainly limited by the accuracy of the OsO4 grid. The set of measurements reveal some discrepancies with data based on measurements performed with the widely used saturated fluorescence technique; we attribute these to pressure shifts of several kilohertz under the conditions of this last method.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::88c1054788321fc6532532cb0854876d https://doi.org/10.1088/0026-1394/34/4/4 Zobrazit plný text záznamu