2013
DOI: 10.1007/s00340-013-5410-9
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Sub-Doppler spectroscopy with an external cavity quantum cascade laser

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Cited by 5 publications
(4 citation statements)
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“…Only in a few cases EC-QCLs have been exploited in conjunction with an OFC, either in an open loop configuration, where their beat-note with the comb was tracked in real time while sweeping their frequency, or more recently in a regime of frequency locking [18], yet without solving the problem of an effective linewidth in excess of 10 MHz. In parallel, it was shown that an improved design of external cavities may result in a significant line narrowing and enables sub-Doppler spectroscopy [19]: specifically, an emission linewidth down to 2.5 MHz was inferred from the instrumental broadening of the observed Lamb dips. However neither any measurement of the frequency noise spectrum of these lasers, nor any attempt to get them locked to an OFC for longer-term stability and absolute frequency calibration has been reported so far.…”
Section: Introductionmentioning
confidence: 99%
“…Only in a few cases EC-QCLs have been exploited in conjunction with an OFC, either in an open loop configuration, where their beat-note with the comb was tracked in real time while sweeping their frequency, or more recently in a regime of frequency locking [18], yet without solving the problem of an effective linewidth in excess of 10 MHz. In parallel, it was shown that an improved design of external cavities may result in a significant line narrowing and enables sub-Doppler spectroscopy [19]: specifically, an emission linewidth down to 2.5 MHz was inferred from the instrumental broadening of the observed Lamb dips. However neither any measurement of the frequency noise spectrum of these lasers, nor any attempt to get them locked to an OFC for longer-term stability and absolute frequency calibration has been reported so far.…”
Section: Introductionmentioning
confidence: 99%
“…The two lasers employed in this work are (1) a commercial cw external cavity quantum cascade laser (Daylight Solutions) covering 1776 to 1958 cm −1 that emits up to 140 mW of optical power and exhibits a linewidth of ≈2 MHz, [15][16][17] and (2) a distributed feedback cw QCL (Maxion Technologies M575AH-NS) covering 1897-1904 cm −1 , with up to 250 mW of optical power and a linewidth of ≈800 kHz. 4 The distributed feedback (DFB) laser resides in an in-house designed mount cooled by a two stage Peltier thermoelectric cooler and is driven by a custom designed low noise current source.…”
Section: Methodsmentioning
confidence: 99%
“…While in recent years Doppler-free saturation spectroscopy based on QCLs has been successfully established in the mid-infrared spectral region [7][8][9][10], previous results in the THz range are solely based on upconversion of microwave sources [11,12]. While optical saturation with a QCL was already reported in an earlier study for a transition of methanol at 2.5 THz, no Doppler-free spectra were obtained [13].…”
Section: Introductionmentioning
confidence: 97%