모드 잠금된 펄스 레이저와 연속 발진하는 반도체 레이저를 이용한 합주파수 생성
Sum-frequency Generation Using a Mode-locked Pulsed Laser and a Continuous-wave Diode Laser
김현학 ㆍ박남훈ㆍ염동일ㆍ차명식ㆍ문한섭 1†
한국광학회지 Vol. 32 No.2 (2021 April) pp. 62-67
Fig. 1 Experimental setup for sum-frequency generation in a PPLN crystal. Pump: 1,560.7 nm (mode-locked fiber laser), 1,551 nm (continuous wave diode laser). FPC, fiber polarization controller; PBS, polarizing beamsplitter; L, lens (focal length: 400 mm); PPLN, periodically poled lithium niobate; DM, dichroic mirror (R: 780 nm, T: 1,550 nm); ω c , continuous-wave diode laser frequency; ω p , pulse laser frequency; ω s , sum frequency.
본 연구에서는 모드 잠금된 ps-펄스 광섬유 레이저와 연속 발진하는 좁은 선폭의 반도체 레이저를 이용하여 주기적 분극반전된 LiNbO3 (periodically poled lithium niobate; PPLN) 결정에서 합주파수 생성 연구를 수행하였다. 모드 잠금된 펄스 레이저는 중심 파장이 1560.7 nm이고 스펙트럼의 폭은 약 1.1 nm이며, 연속 발진 반도체 레이저는 중심 파장이 1551 nm이고 스펙트럼의 폭은 약 6 MHz로 동작한다. 합주파수 생성을 효과적으로 수행하기 위해서 하나의 단일 모드 광섬유를 이용하여 PPLN 결정 내부에서 두 펌프 광원을 공간적으로 완전히 중첩하였다. 모드 잠금된 펄스 레이저와 좁은 선폭의 연속발진 반도체 레이저에 의해서 모드 잠금된 펄스 형태의 778 nm인 합주파수 생성을 스펙 트럼과 시간적인 변화로 확인하였다. 본 연구 결과는 주파수 제어가 가능한 광주파수 빗(optical frequency comb)을 이용한 광주파수 측정및 고분해 레이저 분광 연구 등 다양하게 응용될 수 있을 것으로 기대된다.
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