Development of an optical frequency comb around 1556 nm referenced to an Rb frequency standard at 778 nm
| Autor: | O. Acef, F. Ducos, J. Honthaas |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Laser diode
business.industry Lithium niobate Second-harmonic generation Nonlinear optics Frequency standard Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Laser linewidth Frequency comb chemistry.chemical_compound Optics chemistry law Laser power scaling business Instrumentation |
| Zdroj: | The European Physical Journal Applied Physics. 20:227-231 |
| ISSN: | 1286-0050 1286-0042 |
| DOI: | 10.1051/epjap:2002096 |
| Popis: | To transfer and expand in the optical telecommunication range the accurate 5S 1/2 ( F = 3) – 5D 5/2 ( F = 5) rubidium frequency reference at 778 nm (385.285 THz), we employ a second harmonic generation (SHG) process coupled to an optical frequency comb (OFC) both based on the use of a low power and narrow linewidth laser diode operating around 1556 nm. The Rb optical frequency reference is known with an accuracy of 2.6 × 10 −12 and exhibits a frequency stability of 4 × 10 −13 τ −1/2 , with a Flicker plateau of 2 × 10 −14 for τ > 200 s. With 20 mW of laser power at 1556 nm, we perform a SHG process in a periodically poled lithium niobate (PPLN) crystal and we obtain 6.5 μ W of harmonic radiation at 778 nm, used to phase lock the IR laser against a Rb optical frequency standard (OFS). This Rb-referenced fundamental radiation at 1556 nm is duplicated as 34 lines spaced by 10 GHz using an electro-optic phase modulator (EOM). This preliminary result is mainly limited by unexpected high optical losses in the Fabry Perot cavity, which comprises the EOM. |
| Databáze: | OpenAIRE |
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