이중공명 광펌핑을 이용한 1.5 μm 반도체 레이저 주파수 안정화
Frequency stabilization of 1.5 μm laser diode by using double resonance optical pumping
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우리는 이중공명 광펌핑(double resonance optical pumping; DROP)효과를 이용하여 루비듐(87Rb) 원자의 5P3/2-4D3/2와 5P3/2-4D5/2 전이선에서 DROP 스펙트럼을 관측하고, 1.5 m 레이저의 주파수를 무변조 안정화하였다. 관측한 DROP 스펙트럼은 기존의 광-광 이중공명(optical-optical double resonance; OODR) 스펙트럼보다 높은 신호대잡음비를 가지며, 약 10 MHz의 좁은 선폭을 갖고 있 다. DROP 스펙트럼의 상대적인 세기는 자발방출에 의한 광펌핑 정도로 설명할 수 있었다. DROP스펙트럼에 안정화된 1.5 m 레이 저의 주파수 흔들림은 샘플링 시간 0.1초에서 0.2 MHz로 측정되었고, 상대주파수 흔들림은 평균시간 100초에서 약 1×10-11이었다.
Abstract
We present the double resonance optical pumping(DROP) spectra in the transition 5P3/2-4D3/2 and 5P3/2-4D5/2 of 87Rb and the frequency stabilization in the 1.5 m region using those spectra. Those spectra have high signal-to-noise ratio and narrow spectral linewidth, which is about 10 MHz. We could account for the relative intensities of the hyperfine states of those spectra by the spontaneous emission into the other state. When the frequency of the 1.5 m laser diode was stabilized to the DROP spectrum, the frequency fluctuation was about 0.2 MHz for sampling time of 0.1 s and the Allan deviation(or the square root of the Allan variance) was about 1×10-11 for averaging time of 100s.
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