基于气相微谐振器的无外泵浦梳状谱laser
Gas-phase microresonator-based comb spectroscopy without an external pump laser
摘要：
我们提出了一种新的方法来实现基于微谐振梳的高分辨率光谱，结合了光纤激光腔与微谐振器。虽然基于芯片的梳状源的光谱分辨率通常受到微谐振器的自由光谱范围（FSR）的限制，但我们通过控制集成加热器在一个FSR上调谐200 GHz重复率梳来克服这一限制。我们的双腔方案允许自启动梳产生，而不需要传统的泵浦腔失谐，同时实现等于梳线宽的光谱分辨率。我们使用60 GHz的粗分辨率光谱仪，以250 MHz/光谱步长交错800个光谱，测量乙炔的宽带分子吸收光谱，并利用集成加热器的进步，该加热器可以局部快速地改变微谐振器的折射率，并且耗电量低（0.9 GHz/mW），这比基于光纤的梳状低几个数量级。这种方法提供了一条通向简单、鲁棒和低功耗CMOS兼容平台的途径，该平台能够进行遥感。
英文摘要：
We present a novel approach to realize microresonator-comb-based high resolution spectroscopy that combines a fiber-laser cavity with a microresonator. Although the spectral resolution of a chip-based comb source is typically limited by the free spectral range (FSR) of the microresonator, we overcome this limit by tuning the 200-GHz repetition-rate comb over one FSR via control of an integrated heater. Our dual-cavity scheme allows for self-starting comb generation without the need for conventional pump-cavity detuning while achieving a spectral resolution equal to the comb linewidth. We measure broadband molecular absorption spectra of acetylene by interleaving 800 spectra taken at 250-MHz per spectral step using a 60-GHz-coarse-resolution spectrometer and exploits advances of integrated heater which can locally and rapidly change the refractive index of a microresonator with low electrical consumption (0.9 GHz/mW), which is orders of magnitude lower than a fiber-based comb. This approach offers a path towards a simple, robust and low-power consumption CMOS-compatible platform capable of remote sensing.
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