基于光谱烧孔的双外差探测稀土掺杂晶体超稳laser
Double-heterodyne probing for ultra-stable laser based on spectral hole burning in a rare-earth doped crystal
摘要：
我们提出了一种实验技术，实现一个特定的吸收光谱图案在稀土掺杂晶体在低温下。随后在两个光谱通道上同时探测该图案，从而产生误差信号，该误差信号允许激光器在所述光谱图案上的频率锁定。两个通道的适当组合导致检测噪声的大幅降低，为实现超稳定激光器铺平了道路，对于该超稳定激光器，当使用多个通道时，可以使检测噪声任意低。我们利用这种技术实现了频率不稳定度为$1.7\times 10^{-15}$的激光器，不受探测噪声的限制，但受晶体的环境扰动。这与迄今为止稀土掺杂晶体稳定激光器在1秒时表现出的最低不稳定性相当。
英文摘要：
We present an experimental technique for realizing a specific absorption spectral pattern in a rare-earth-doped crystal at cryogenic temperatures. This pattern is subsequently probed on two spectral channels simultaneously, thereby producing an error signal allowing frequency locking of a laser on the said spectral pattern. Appropriate combination of the two channels leads to a substantial reduction of the detection noise, paving the way to realizing an ultra-stable laser for which the detection noise can be made arbitrarily low when using multiple channels. We use such technique to realize a laser with a frequency instability of $1.7\times 10^{-15}$ at 1 second, not limited by the detection noise but by environmental perturbation of the crystal. This is comparable with the lowest instability demonstrated at 1 second to date for rare-earth doped crystal stabilized lasers.
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