Coherent sources for mid-infrared laser spectroscopy

Mid-infrared laser absorption spectroscopy (LAS) is useful for molecular trace gas concentration measurements in gas mixtures. While the gas chromatography-mass spectrometry is still the gold standard in gas analysis, LAS offers several advantages. It takes tens of minutes for a gas mixture to be separated in the capillary column precluding gas chromatography from real-time control of industrial processes, while LAS can measure the concentration of gas species in seconds. LAS can be used in a wide range of applications such as gas quality screening for regulation, metering and custody transfer,1 purging gas pipes to avoid explosions,1 monitoring combustion processes,2 detection and quantification of gas leaks,3 by-products monitoring to provide feedback for the real-time control of processes in petrochemical industry,4 real-time control of inductively coupled plasma etch reactors,5, 6 and medical diagnostics by means of time-resolved volatile organic compound (VOC) analysis in exhaled breath.7 Apart from the concentration, it also permits us to determine the temperature, pressure, velocity and mass flux of the gas under observation. The selectivity and sensitivity of LAS is linked to a very high spectral resolution given by the linewidth of single-frequency lasers. Measurements are performed at reduced pressure where the collisional and Doppler broadenings are balanced. The sensitivity can be increased to ppb and sometimes to ppt ranges by increasing the interaction length in multi-pass gas cells or resonators and also by adopting modulation techniques.8

[1]  M. Loupias,et al.  The VIRGO large mirrors: a challenge for low loss coatings , 2004 .

[2]  Chuji Wang,et al.  Breath Analysis Using Laser Spectroscopic Techniques: Breath Biomarkers, Spectral Fingerprints, and Detection Limits , 2009, Sensors.

[3]  G. Bjorklund,et al.  Frequency-modulation spectroscopy: a new method for measuring weak absorptions and dispersions. , 1980, Optics letters.

[4]  Jun Ye,et al.  Ultrasensitive detections in atomic and molecular physics: demonstration in molecular overtone spectroscopy , 1998 .

[5]  R. Hanson,et al.  Calibration-free wavelength-modulation spectroscopy for measurements of gas temperature and concentration in harsh environments. , 2009, Applied optics.

[6]  I. Coddington,et al.  Dual-comb spectroscopy. , 2016, Optica.

[7]  E. D. Hinkley,et al.  HIGH‐RESOLUTION INFRARED SPECTROSCOPY WITH A TUNABLE DIODE LASER , 1970 .

[8]  M. Yamada,et al.  First‐order quasi‐phase matched LiNbO3 waveguide periodically poled by applying an external field for efficient blue second‐harmonic generation , 1993 .

[9]  J G Anderson,et al.  Ultrasensitive absorption spectroscopy with a high-finesse optical cavity and off-axis alignment. , 2001, Applied optics.

[10]  André Clairon,et al.  An agile laser with ultra-low frequency noise and high sweep linearity. , 2009, Optics express.

[11]  David H. Parker,et al.  Coherent cavity ring down spectroscopy , 1994 .

[12]  J. Faist,et al.  Quantum Cascade Laser , 1994, Science.

[13]  M. Carras,et al.  Optical-feedback cavity-enhanced absorption spectroscopy with a quantum-cascade laser yields the lowest formaldehyde detection limit , 2013, Applied Physics B.

[14]  Thomas F. Gallagher,et al.  Two-tone frequency-modulation spectroscopy , 1986 .

[15]  M. Carras,et al.  Optical-feedback cavity-enhanced absorption spectroscopy with a quantum cascade laser. , 2010, Optics letters.

[16]  P. L. Kelley,et al.  Detection of Air Pollutants with Tunable Diode Lasers , 1971, Science.

[17]  Yauhen Baravets,et al.  Comparison of widely tunable narrow-band CW MIR generators based on the difference frequency generation in KTP and KTA crystals , 2014 .

[18]  William W. Bewley,et al.  Interband cascade laser emitting at λ=3.75μm in continuous wave above room temperature , 2008 .

[19]  R. Tatam,et al.  Optical gas sensing: a review , 2012 .

[20]  J. A. Silver,et al.  Frequency modulation and wavelength modulation spectroscopies: comparison of experimental methods using a lead-salt diode laser. , 1992, Applied optics.

[21]  John Tulip,et al.  Real-time monitoring of benzene, toluene, and p-xylene in a photoreaction chamber with a tunable mid-infrared laser and ultraviolet differential optical absorption spectroscopy. , 2011, Applied optics.

[22]  J. Henningsen,et al.  Quantitative wavelength-modulation spectroscopy without certified gas mixtures , 2000 .

[23]  Marc Schaepkens,et al.  Gas-phase studies in inductively coupled fluorocarbon plasmas , 2001 .

[24]  Rui Q. Yang Infrared laser based on intersubband transitions in quantum wells , 1995 .

[25]  Rudy Peeters,et al.  Cavity enhanced absorption and cavity enhanced magnetic rotation spectroscopy , 1998 .

[26]  J. Stafford-Evans,et al.  Standoff sensing of natural gas leaks: evolution of the remote methane leak detector (RMLD) , 2005, 2005 Quantum Electronics and Laser Science Conference.

[27]  Ronald K. Hanson,et al.  Simultaneous sensing of temperature, CO, and CO2 in a scramjet combustor using quantum cascade laser absorption spectroscopy , 2014 .

[28]  A. O’Keefe,et al.  Cavity ring‐down optical spectrometer for absorption measurements using pulsed laser sources , 1988 .

[29]  Harald Simonsen,et al.  Quantitative wavelength modulation spectroscopy with diode lasers , 1999 .

[30]  Giorgio Santarelli,et al.  Ultralow-frequency-noise stabilization of a laser by locking to an optical fiber-delay line. , 2009, Optics letters.

[31]  Mattias Beck,et al.  Continuous Wave Operation of a Mid-Infrared Semiconductor Laser at Room Temperature , 2001, Science.

[32]  W. Johnstone,et al.  Tunable Diode-Laser Spectroscopy With Wavelength Modulation: A Calibration-Free Approach to the Recovery of Absolute Gas Absorption Line Shapes , 2007, Journal of Lightwave Technology.

[33]  Fei Yang,et al.  Subkilohertz linewidth reduction of a DFB diode laser using self-injection locking with a fiber Bragg grating Fabry-Perot cavity. , 2016, Optics express.

[34]  James J. Scherer,et al.  CW integrated cavity output spectroscopy , 2001 .

[35]  F. Tittel,et al.  Development of an automated diode-laser-based multicomponent gas sensor. , 2000, Applied optics.

[36]  Ronald K. Hanson,et al.  In situ measurements of HCl during plasma etching of poly-silicon using a diode laser absorption sensor , 2003 .

[37]  Jun Ye,et al.  High-performance near- and mid-infrared crystalline coatings , 2016, 1604.00065.

[38]  Ondrej Cíp,et al.  Frequency Noise Suppression of a Single Mode Laser with an Unbalanced Fiber Interferometer for Subnanometer Interferometry , 2015, Sensors.

[39]  Can Li,et al.  The ASE noise of a Yb3+-doped phosphate fiber single-frequency laser at 1083 nm , 2014 .

[40]  Frank K. Tittel,et al.  Tunable, fiber coupled spectrometer based on difference-frequency generation in periodically poled lithium niobate , 2001 .

[41]  Peter Werle,et al.  A review of recent advances in semiconductor laser based gas monitors , 1998 .

[42]  S. Schiller,et al.  Spectrometry with frequency combs. , 2002, Optics letters.