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Frequency stabilization of a frequency-doubled 197.2 THz distributed feedback diode laser on rubidium 5S1/2→7S1/2 two-photon transitions |
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| Authors: | Hsiang-Chen Chui Ming-Sheng Ko Yi-Wei Liu Tyson Lin Jow-Tsong Shy Sen-Yen Shaw Rostislav V. Roussev Martin M. Fejer |
| Affiliation: | aDepartment of Electrical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan;bDepartment of Physics, National Tsing Hua University, Hsinchu 300, Taiwan;cInstitute of Optics Physics, Feng Chia University, Taichung 407, Taiwan;dDepartment of Applied Physics, Stanford University, Stanford, California 94305-4090, USA |
| Abstract: | A 197.2 THz (1520.2 nm) ITU-T grid distributed feedback (DFB) diode laser is frequency stabilized at 197.198 THz by 1ocking its second harmonic (SH) signal on the rubidium 5S1/2→7S1/2 two-photon transition at 394.396 THz (760.1 nm). With 100 mW from the DFB diode laser and amplifying by an erbium-doped fiber amplifier, we obtain an SH power of 15 mW using a periodically poled lithium niobate (PPLN) waveguide frequency doubler. The stability was 2×10−11 (10 s), corresponding to a frequency variation of 4 kHz at 1520.2 nm. Our scheme provides a compact and high performance frequency reference in the communication band. |
| Keywords: | Frequency stabilization Rubidium Two-photon spectroscopy Nonlinear optics WDM systems |
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