Analysis of trace impurities in semiconductor gas via cavity-enhanced direct frequency comb spectroscopy

Cossel, Kevin C.; Adler, Florian; Bertness, Kristine A.; Thorpe, Michael J.; Feng, Jun; Raynor, Mark W.; Ye, Jun

doi:10.1007/s00340-010-4132-5

Cited by 36 publications

(43 citation statements)

References 30 publications

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“…This ability to rapidly cover thousands of cm −1 with high sensitivity and high resolution will be a powerful new tool for the study of ions and radicals for many applications. In addition, applications to other many other spectral regions are possible by using different comb sources combined with non-linear optics for covering the near-IR [65,66] or mid-IR [67,68,69,70,71]. These sources plus readout systems using different cameras or optical up-conversion [72] create the possibility of ion spectroscopy anywhere from the visible to the mid-IR.…”

Section: Outlook and Conclusionmentioning

confidence: 99%

Broadband velocity modulation spectroscopy of HfF+: Towards a measurement of the electron electric dipole moment

Cossel

Gresh

Sinclair

et al. 2012

Chemical Physics Letters

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Precision spectroscopy of trapped HfF + will be used in a search for the permanent electric dipole moment of the electron (eEDM). While this dipole moment has yet to be observed, various extensions to the standard model of particle physics (such as supersymmetry) predict values that are close to the current limit. We present extensive survey spectroscopy of 19 bands covering nearly 5000 cm −1 using both frequency-comb and single-frequency laser velocity-modulation spectroscopy. We obtain high-precision rovibrational constants for eight electronic states including those that will be necessary for state preparation and readout in an actual eEDM experiment.

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Section: Outlook and Conclusionmentioning

confidence: 99%

Broadband velocity modulation spectroscopy of HfF+: Towards a measurement of the electron electric dipole moment

Cossel

Gresh

Sinclair

et al. 2012

Chemical Physics Letters

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“…Dispersive methods for imaging a frequency comb spectrum have been shown with Vernier coupling of comb and cavity [12] or a high resolution etalon [3,13,14]. Matching the mode spacing of a cavity to the repetition rate of a mode-locked laser Fig.…”

Section: Introductionmentioning

confidence: 99%

Mid-infrared upconversion spectroscopy based on a Yb:fiber femtosecond laser

Johnson

Diddams

2011

Appl. Phys. B

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We present a system for molecular spectroscopy using a broadband mid-infrared laser with near-infrared detection. Difference frequency generation of a Yb:fiber femtosecond laser produced a mid-infrared (MIR) source tunable from 2100-3700 cm −1 (2.7-4.7 μm) with average power up to 40 mW. The MIR spectrum was upconverted to near-infrared wavelengths for broadband detection using a two-dimensional dispersion imaging technique. Absorption measurements were performed over bandwidths of 240 cm −1 (7.2 THz) with 0.048 cm −1 (1.4 GHz) resolution, and absolute frequency scale uncertainty was better than 0.005 cm −1 (150 MHz). The minimum detectable absorption coefficient per spectral element was determined to be 4.4 × 10 −7 cm −1 from measurements in low pressure CH 4 , leading to a projected detection limit of 2 parts-per-billion of methane in pure nitrogen. In a natural atmospheric sample, the methane detection limit was found to be 30 parts-perbillion. The spectral range, resolution, and frequency accuracy of this system show promise for determination of trace concentrations in gas mixtures containing both narrow and broad overlapping spectral features, and we demonstrate this in measurements of air and solvent samples.

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“…Progress towards longer wavelengths has recently yielded new direct OFC sources, including the Tm:fiber laser operating at 2 µm [48] and the Cr 2+ :ZnSe laser operating at 2.4 µm [49]. Longer wavelengths can also be reached via nonlinear processes, by Raman shifting [50], difference-frequency generation [51][52][53], or with optical parametric oscillators [54][55][56][57]. The latter two provide spectral access to the important molecular fingerprint region located above 3 µm.…”

Section: Introductionmentioning

confidence: 99%

“…The latter two provide spectral access to the important molecular fingerprint region located above 3 µm. DFC spectrometers, employing both multi-pass cells and optical enhancement cavities, have already been used for detection of numerous molecular species important for environmental research [39,44,58,59], monitoring of production processes [50,60], and have enormous potential as a tool for non-invasive human breath analysis [36,44]. In the latter application, the ability to measure accurate broadband absorption spectra in real time will allow discriminating between more than 500 molecular species present at different concentrations in human breath [7].…”

Section: Introductionmentioning

confidence: 99%

Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide

et al. 2012

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Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide. Abstract We demonstrate the first cavity-enhanced optical frequency comb spectroscopy in the mid-infrared wavelength region and report the sensitive real-time trace detection of hydrogen peroxide in the presence of a large amount of water. The experimental apparatus is based on a midinfrared optical parametric oscillator synchronously pumped by a high-power Yb:fiber laser, a high-finesse broadband cavity, and a fast-scanning Fourier transform spectrometer with autobalancing detection. The comb spectrum with a bandwidth of 200 nm centered around 3.76 µm is simultaneously coupled to the cavity and both degrees of freedom of the comb, i.e. the repetition rate and carrier envelope offset frequency, are locked to the cavity to ensure stable transmission. The autobalancing detection scheme reduces the intensity noise by a factor of 300, and a sensitivity of 5.4 × 10 −9 cm −1 Hz −1/2 with a resolution of 800 MHz is achieved (corresponding to 6.9 × 10 −11 cm −1 Hz −1/2 per spectral element for 6000 resolved elements). This yields a noise equivalent detection limit for hydrogen peroxide of 8 parts-per-billion (ppb); in the presence of 2.8 % of water the detection limit is 130 ppb. Spectra of acetylene, methane, and nitrous oxide at atmospheric pressure are also presented, A. Foltynowicz ( ) · Applied physics. B, Lasers and optics (Print),

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Analysis of trace impurities in semiconductor gas via cavity-enhanced direct frequency comb spectroscopy

Abstract: Cavity-enhanced direct frequency comb spectroscopy (CE-DFCSfor trace water doped in arsine.

Cited by 36 publications

References 30 publications

Broadband velocity modulation spectroscopy of HfF+: Towards a measurement of the electron electric dipole moment

Broadband velocity modulation spectroscopy of HfF+: Towards a measurement of the electron electric dipole moment

Mid-infrared upconversion spectroscopy based on a Yb:fiber femtosecond laser

Cavity-enhanced optical frequency comb spectroscopy in the mid-infrared application to trace detection of hydrogen peroxide

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