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单光子波长调制吸收光谱用于1．5μm激光器的波长锁定
Single photon wavelength modulation absorption spectrum of acetylene for 1.5μm laser wavelength stabilization＊
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摘要: 提出了一种kHz调制频率量级的单光子调制技术，实现对激光器的实时锁定．通过探测乙炔气体的单光子吸收光谱，对离散的单光子响应脉冲进行锁定放大，获得激光器频率锁定的鉴频曲线．将1．5μm分布反馈半导体激光器的输出频率稳定在乙炔气体v1＋v3带P5e支吸收峰上，在175s内典型激光频率起伏小于25MHz．这种基于单光子波长高频调制吸收光谱的稳频技术消除了低频段较高背景的噪声，可应用于单光子量级的量子保密通讯系统以及光学波分复用系统．Abstract: We describe a kHz single photon wavelength modulation technology to realize the locking reference signal of the laser frequency. By detecting the single photon acetylene gas absorption spectrum and by amplifying the lock-in the discrete single photon response pulse, we achieve the laser frequency stabilized in real time. The 1.5μm distribution feedback semiconductor laser output frequency is stabilized at acetylene gas absorption peaks, and the typical laser frequency fluctuation is less than 25 MHz within 175 s. This single photon wavelength modulated absorption spectrum technology eliminates the high background noise in low frequency range and can be used in the quantum communication system and optical wavelength division multiplex.
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