论文标题
基于稀土掺杂晶体的光谱孔燃烧的超稳定激光的双障碍探测
Double-heterodyne probing for ultra-stable laser based on spectral hole burning in a rare-earth doped crystal
论文作者
论文摘要
我们提出了一种实验技术，用于在低温温度下在稀土掺杂的晶体中实现特定的吸收光谱模式。随后将该模式同时在两个光谱通道上进行探测，从而产生误差信号，允许在上述光谱模式上频率锁定激光器。两个通道的适当组合导致检测噪声的大幅降低，为实现超稳的激光铺平了道路，在使用多个通道时，可以任意将检测噪声降低。我们使用此类技术实现激光器的频率不稳定为$ 1.7 \ times 10^{ - 15} $在1秒时，不受检测噪声的限制，而是受环境扰动的限制。这与稀土掺杂晶体稳定激光器在1左右的最低不稳定性相当。
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.
