Optoelectronic Oscillator Stabilized to an Intra-loop Atomic Filter with a Coherent Population Trapping Resonance
Optoelectronic Oscillator Stabilized to an Intra-loop Atomic Filter with a Coherent Population Trapping Resonance
- 주제(키워드) Optoelectronic oscillator , Atomic clock , Coherent population trapping
- 발행기관 한국물리학회
- 발행년도 2012
- 총서유형 Journal
- UCI G704-000411.2012.61.1.001
- KCI ID ART001678374
- 본문언어 영어
초록/요약
We report the construction and characterization of an optoelectronic oscillator stabilized to an intra-loop <sup>85</sup>Rb cell with a 3.036-GHz coherent population trapping (CPT) resonance. We use an extended-cavity diode laser (ECDL) as a light source and directly modulate its injection current by using the beating signal filtered by the CPT resonance. Use of the ECDL guarantees stability of the carrier frequency and eliminates a bulky and power-consuming external modulator. We also adjust the cavity length and operate the ECDL in multimode in order to achieve a high modulation efficiency. To further improve the oscillator’s frequency stability, we incorporate a negative feedback system based on a CPT dispersion. The Allan deviation of the oscillator frequency is 3 × 10<sup>−10</sup> at a 100-s integration time.
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