Sub-Doppler spectroscopy with an external cavity quantum cascade laser

Walker, Richard; Kirkbride, James M. R.; Helden, J. H. van; Weidmann, Damien; Ritchie, Grant A. D.

doi:10.1007/s00340-013-5410-9

Cited by 5 publications

(4 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77 μm

Alsaif¹,

Gatti²,

Lamperti³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

Marangoni, M. (2019). Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77Abstract: We study the frequency noise and the referencing to a near-infrared frequency comb of a widely tunable external-cavity quantum-cascade-laser that shows a relatively narrow free-running emission linewidth of 1.7 MHz. The frequency locking of the laser to the comb further narrows its linewidth to 690 kHz and enables sub-Doppler spectroscopy on an N 2 O transition of the ν 1 band near 7.7 μm with sub-MHz resolution and absolute frequency calibration. The combined uncertainty on the measured transition center is estimated to be less than 50 kHz.

show abstract

Section: Introductionmentioning

confidence: 99%

Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77 μm

Alsaif¹,

Gatti²,

Lamperti³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

show abstract

“…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%

Pump and probe spectroscopy with continuous wave quantum cascade lasers

Kirkbride

Causier

Dalton

et al. 2014

The Journal of Chemical Physics

View full text Add to dashboard Cite

This paper details infra-red pump and probe studies on nitric oxide conducted with two continuous wave quantum cascade lasers both operating around 5 μm. The pump laser prepares a velocity selected population in a chosen rotational quantum state of the v = 1 level which is subsequently probed using a second laser tuned to a rotational transition within the v = 2 ← v = 1 hot band. The rapid frequency scan of the probe (with respect to the molecular collision rate) in combination with the velocity selective pumping allows observation of marked rapid passage signatures in the transient absorption profiles from the polarized vibrationally excited sample. These coherent transient signals are influenced by the underlying hyperfine structure of the pump and probe transitions, the sample pressure, and the coherent properties of the lasers. Pulsed pump and probe studies show that the transient absorption signals decay within 1 μs at 50 mTorr total pressure, reflecting both the polarization and population dephasing times of the vibrationally excited sample. The experimental observations are supported by simulation based upon solving the optical Bloch equations for a two level system.

show abstract

“…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%

Doppler-free spectroscopy with a terahertz quantum-cascade laser

et al. 2018

View full text Add to dashboard Cite

We report on the Doppler-free saturation spectroscopy of a molecular transition at 3.3 THz based on a quantum-cascade laser and an absorption cell in a collinear pump-probe configuration. A Lamb dip with a sub-Doppler linewidth of 170 kHz is observed for a rotational transition of HDO. We found that a certain level of external optical feedback is tolerable as long as the free spectral range of the external cavity is large compared to the width of the absorption line.

show abstract

Sub-Doppler spectroscopy with an external cavity quantum cascade laser

Cited by 5 publications

References 46 publications

Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77 μm

Comb-calibrated sub-Doppler spectroscopy with an external-cavity quantum cascade laser at 77 μm

Pump and probe spectroscopy with continuous wave quantum cascade lasers

Doppler-free spectroscopy with a terahertz quantum-cascade laser

Contact Info

Product

Resources

About