WO2018172391A3 - Fourier spectrometer having a multi-mode quantum cascade laser, and method for spectroscopic analysis of a sample - Google Patents

Fourier spectrometer having a multi-mode quantum cascade laser, and method for spectroscopic analysis of a sample Download PDF

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Publication number
WO2018172391A3
WO2018172391A3 PCT/EP2018/057105 EP2018057105W WO2018172391A3 WO 2018172391 A3 WO2018172391 A3 WO 2018172391A3 EP 2018057105 W EP2018057105 W EP 2018057105W WO 2018172391 A3 WO2018172391 A3 WO 2018172391A3
Authority
WO
WIPO (PCT)
Prior art keywords
sample
qcl
tuning
resonator
laser
Prior art date
Application number
PCT/EP2018/057105
Other languages
German (de)
French (fr)
Other versions
WO2018172391A2 (en
Inventor
Benjamin RÖBEN
Martin Hempel
Xiang LÜ
Klaus Biermann
Lutz SCHROTTKE
Holger T. GRAHN
Original Assignee
Forschungsverbund Berlin E.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Forschungsverbund Berlin E.V. filed Critical Forschungsverbund Berlin E.V.
Publication of WO2018172391A2 publication Critical patent/WO2018172391A2/en
Publication of WO2018172391A3 publication Critical patent/WO2018172391A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/45—Interferometric spectrometry
    • G01J3/453—Interferometric spectrometry by correlation of the amplitudes
    • G01J3/4535—Devices with moving mirror
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
    • H01S5/06213—Amplitude modulation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
    • G01J3/433—Modulation spectrometry; Derivative spectrometry
    • G01J2003/4334—Modulation spectrometry; Derivative spectrometry by modulation of source, e.g. current modulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
    • H01S5/0622—Controlling the frequency of the radiation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/30—Structure or shape of the active region; Materials used for the active region
    • H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
    • H01S5/3401—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers having no PN junction, e.g. unipolar lasers, intersubband lasers, quantum cascade lasers

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

The invention relates to a Fourier spectrometer for spectroscopically analysing a sample, comprising: a multi-mode quantum cascade laser (QCL) that has an active QCL region in a laser resonator, which is configured to generate laser light with emission frequencies according to a plurality of resonator modes of said laser resonator, an excitation device configured to electrically excite said active QCL region using an electric pump current, and a tuning device by means of which the resonator modes can be set; an interferometer for producing an interferogram on the basis of the laser light; a detector device for detecting the interferogram following interaction with the sample and for acquiring a detector signal containing the detected interferogram, within a detector measuring time; and an evaluation device that is configured to acquire a spectrum of the sample using a Fourier transform of the detected interferogram. The QCL tuning device is designed to periodically and spectrally vary the resonator modes, with a tuning time period of less than 1 minute, in a spectral tuning interval which is at least equal to the spacing between consecutive resonator modes of the laser resonator, the active QCL region is configured to generate laser light with emission frequencies in the range of 1 THz to 6 THz, wherein the emission frequencies of the laser light cover a spectral emission range of at least 50 GHz, and the detector device is designed to temporally average the detector signal over the tuning time period of the QCL tuning device. The invention also relates to a method for spectroscopically analysing a sample using the spectrometer.
PCT/EP2018/057105 2017-03-22 2018-03-21 Fourier spectrometer having a multi-mode quantum cascade laser, and method for spectroscopic analysis of a sample WO2018172391A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017002874.5 2017-03-22
DE102017002874.5A DE102017002874B4 (en) 2017-03-22 2017-03-22 Fourier spectrometer with a multimode quantum cascade laser, and method for spectroscopic examination of a sample

Publications (2)

Publication Number Publication Date
WO2018172391A2 WO2018172391A2 (en) 2018-09-27
WO2018172391A3 true WO2018172391A3 (en) 2018-11-29

Family

ID=61731654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/057105 WO2018172391A2 (en) 2017-03-22 2018-03-21 Fourier spectrometer having a multi-mode quantum cascade laser, and method for spectroscopic analysis of a sample

Country Status (2)

Country Link
DE (1) DE102017002874B4 (en)
WO (1) WO2018172391A2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015163965A2 (en) 2014-02-04 2015-10-29 Board Of Regents, The University Of Texas System Monolithic tunable terahertz radiation source using nonlinear frequency mixing in quantum cascade lasers

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
BENJAMIN RÖBEN ET AL: "Terahertz quantum-cascade lasers as high-power and wideband, gapless sources for spectroscopy", OPTICS EXPRESS, vol. 25, no. 14, 29 June 2017 (2017-06-29), pages 16282, XP055496165, DOI: 10.1364/OE.25.016282 *
GUREL K ET AL: "Characterization of a new frequency tuning and modulation mechanism for spectroscopy in a quantum cascade laser", 2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), OSA, 5 June 2016 (2016-06-05), pages 1 - 2, XP033024374 *
H.-W. HÜBERS ET AL: "High Resolution Terahertz Spectroscopy with Quantum Cascade Lasers", JOURNAL OF INFRARED, MILLIMETER AND TERAHERTZ WAVES, vol. 34, no. 5-6, 4 April 2013 (2013-04-04), US, pages 325 - 341, XP055497352, ISSN: 1866-6892, DOI: 10.1007/s10762-013-9973-7 *
M. WIENOLD ET AL: "Frequency comb operation of long-cavity terahertz quantum-cascade lasers", PROCEEDINGS OF SPIE, vol. 9767, 7 March 2016 (2016-03-07), 1000 20th St. Bellingham WA 98225-6705 USA, pages 97671A, XP055496067, ISSN: 0277-786X, ISBN: 978-1-5106-1533-5, DOI: 10.1117/12.2208128 *
SCHROTTKE L ET AL: "Terahertz GaAs/AlAs quantum-cascade lasers", APPLIED PHYSICS LETTERS, A I P PUBLISHING LLC, US, vol. 108, no. 10, 7 March 2016 (2016-03-07), XP012205588, ISSN: 0003-6951, [retrieved on 19010101], DOI: 10.1063/1.4943657 *

Also Published As

Publication number Publication date
DE102017002874A1 (en) 2018-09-27
WO2018172391A2 (en) 2018-09-27
DE102017002874B4 (en) 2022-04-28

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