期刊
OPTICA
卷 2, 期 10, 页码 836-840出版社
Optica Publishing Group
DOI: 10.1364/OPTICA.2.000836
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资金
- ETH Pioneer Fellowship programme
- European Laboratory for Non-linear Spectroscopy (Florence)
- Italian National Institute of Optics (CNR-INO)
- Swiss National Science Foundation [SNF200020-152962]
Optical frequency combs based on quantum cascade lasers have recently been demonstrated in the mid-and far-infrared spectral regions, opening the possibility for broadband, compact spectrometers. The successful operation of these systems will depend on understanding the frequency noise of these lasers, whose mode-locking dynamics leads to an almost constant optical power rather than pulse generation. We demonstrate that the four-wave mixing processresponsible for comb formation-effectively correlates the quantum frequency noise of the individual comb modes. The plateau observed in the high-frequency portion of the noise spectrum is attributed to the quantum noise limit. This result proves that four-wave mixing introduces no additional frequency noise, showing that quantum cascade laser combs are well suited for high-resolution spectroscopy applications. (C) 2015 Optical Society of America
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