Journal ArticleDOI
Time-domain mid-infrared frequency-comb spectrometer.
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TLDR
A novel type of Fourier-transform infrared spectrometer based on two Ti:sapphire lasers emitting femtosecond pulse trains with slightly different repetition frequencies that superimposed upon a detector to produce purely time-domain interferograms that encode the infrared spectrum is demonstrated.Abstract:
A novel type of Fourier-transform infrared spectrometer (FTIR) is demonstrated. It is based on two Ti:sapphire lasers emitting femtosecond pulse trains with slightly different repetition frequencies. Two mid-infrared beams-derived from those lasers by rectification in GaSe-are superimposed upon a detector to produce purely time-domain interferograms that encode the infrared spectrum. The advantages of this spectrometer compared with the common FTIR include ease of operation (no moving parts), speed of acquisition (100 micros demonstrated), and not-yet-shown collimated long-distance propagation, diffraction-limited microscopic probing, and electronically controllable chemometric factoring. Extending time-domain frequency-comb spectroscopy to lower (terahertz) or higher (visible, ultraviolet) frequencies should be feasible.read more
Citations
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Journal ArticleDOI
Microresonator-Based Optical Frequency Combs
TL;DR: A new optical frequency comb generation principle has emerged that uses parametric frequency conversion in high resonance quality factor (Q) microresonators, permitting an increased number of comb applications, such as in astronomy, microwave photonics, or telecommunications.
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Mid-infrared frequency combs
TL;DR: In this paper, the authors discuss the emerging field of mid-infrared frequency comb generation, including technologies based on novel laser gain media, nonlinear frequency conversion and micro-resonators.
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Dual-comb spectroscopy
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Mid-infrared frequency comb based on a quantum cascade laser
TL;DR: A compact, broadband, semiconductor frequency comb generator that operates in the mid-infrared, and it is demonstrated that the modes of a continuous-wave, free-running, broadband quantum cascade laser are phase-locked.
References
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High-Resolution Two-Photon Spectroscopy with Picosecond Light Pulses
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