EP2948782A1 - Système optique d'analyse de spectre d'ondes rf - Google Patents

Système optique d'analyse de spectre d'ondes rf

Info

Publication number
EP2948782A1
EP2948782A1 EP13829016.8A EP13829016A EP2948782A1 EP 2948782 A1 EP2948782 A1 EP 2948782A1 EP 13829016 A EP13829016 A EP 13829016A EP 2948782 A1 EP2948782 A1 EP 2948782A1
Authority
EP
European Patent Office
Prior art keywords
optical system
acousto
resonator
transducer
optic transducer
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP13829016.8A
Other languages
German (de)
English (en)
Inventor
Jacek Galas
Adam Czyzewski
Dariusz Litwin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Instytut Optyki Stosowanej
Original Assignee
Instytut Optyki Stosowanej
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 Instytut Optyki Stosowanej filed Critical Instytut Optyki Stosowanej
Publication of EP2948782A1 publication Critical patent/EP2948782A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G01R23/17—Spectrum analysis; Fourier analysis with optical or acoustical auxiliary devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
    • 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
    • H01S3/08009—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection using a diffraction grating
    • 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/1068—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using an acousto-optical device

Definitions

  • the subject of the invention is an optical system for RP wave spectral analysis for waves transmitted in radio band ranging from 3 kHz to 300 GHz, for use in
  • spectrophotometers intended for analyzing the spectra of light, where light with different wavelengths is directed to a multi-segment photo detector at various angles as a result of utilizing optical paths differences of diffracted and interfering waves.
  • acousto-optic transducers are used that change the diffraction angle of reflected or transmitted light beams on the acoustic diffraction grating generated by the transducer.
  • US4503388 patent presents a system used to detect RF signals taking advantage of a coherent light beam diffraction on the diffraction grating in an acousto-optic transducer as a result of an acoustic wave propagating inside it.
  • the acoustic wave is induced by a piezoelectric transducer being part of the acousto-optic transducer, connected to an antenna for receiving RF signals.
  • the angle of light beam diffraction is proportional to the RF signal frequency.
  • the RF signal detection system includes a monochromatic laser, emitting a light beam at a specific wavelength, depending on the type of active medium.
  • this is a laser arranged as a resonator system, comprising an active medium pumping system placed in a resonant cavity between the system of parallel mirrors, one of which constitutes a semi-reflective output mirror, while the other creates the final component in the resonator optical system that reflects light entirely.
  • Pumping the active medium results in a population inversion that leads to stimulated photon emission.
  • the mirrors reflect part of the emitted photons back to the active medium.
  • Such an optical system is a type of resonator for a specific frequency of electromagnetic waves.
  • a disadvantage of such RF detection systems is their limited scope of application and the necessity of using complex laser light amplifiers.
  • the system for RF signal detection consists of a spectrophotometer, a laser resonator optical system and an acousto-optic transducer, where the wave is excited by a piezoelectric transducer connected to a source of RF signals, according to the invention, rely on that the acousto-optic transducer constitutes the final component in the resonator optical system, while between the resonant cavity and the acousto-optic transducer there is the first optical system that focuses the light wave propagating inside the resonator on the front surface of the waveguide being part of the acousto-optic transducer, the piezoelectric is attached to the waveguide on the opposite side of the front surface forming an extension of resonator optical axis, while between the inlet mirror and the spectrophotometer, there is second optical system used to focus the output light beam at the spectrophotometer inlet.
  • the acousto-optic transducer constitutes the final component in the laser resonator optical system.
  • the diffraction grating generated inside it acts as a selective mirror.
  • light of different wavelength reflects inside the resonator.
  • the output wavelength from the optical resonator system and analyzed in the spectrophotometer is a function of RF signal frequency value.
  • the system presented in the invention makes it possible to analyze the spectrum of RF waves at a very high signal-to- noise ratio.
  • the invention is presented in one of the embodiments in a drawing that shows a schematic diagram of the optical system for RF wave spectral analysis.
  • the optical system for RF wave spectral analysis consists of a spectrophotometer 7, laser resonator optical system and an acousto-optic transducer, where the acoustic wave is excited by piezoelectric transducer 4 connected to the source of tested RF signals.
  • the laser resonator optical system consists of partly-reflective output mirror 1 , resonant cavity with active medium 2, and the final light reflecting component.
  • the resonant cavity constitutes the resonator chamber.
  • the final component in the resonator optical system is the acousto-optic transducer using a piezoelectric transducer 4 attached to the waveguide, where the volume acoustic wave propagates. This wave inside the waveguide generates diffraction grating 3.
  • the piezoelectric transducer 4 is connected to the source of RF signal in the form of antenna equipped with an electronic module that amplifies the received signal.
  • the first focusing optical system 5 that focuses light wave propagating inside the resonator on the front surface of the waveguide being part of the acousto-optic transducer.
  • the piezoelectric transducer 4 is attached to the waveguide on the opposite of the front surface forming an extension of the resonator optical axis.
  • second focusing optical system 6 that focuses the output light beam at the spectrometer 7 inlet.
  • the output mirror 1 is a standard laser mirror, through which the light wave generated in the laser leaves the resonator.
  • the active substance 2 placed in the resonant cavity is supplied with energy to stimulate the so-called population inversion. This energy is usually supplied by a laser diode system.
  • the light wave propagating inside the resonator is focused by the first focusing optical system 5 and projected onto the waveguide front surface being part of the acousto-optic transducer 4.
  • the diffraction grating 3 generated inside acts as a selective mirror. Depending on the acoustic wave length, light of different wavelength is reflected. Remaining part of the light wave continues propagation and is subject to suppression at the joint waveguide material - piezoelectric transducer.
  • the length of acoustical wave generated in the acousto-optic transducer is a function of RF signal received by the antenna.
  • the length of light wave output from the resonator optical system, focused by the second focusing optical system 6 at the spectrophotometer entrance 7, is a function of radio wave frequency coming to the antenna.
  • Light is analyzed at the spectrophotometer 7.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

La présente invention concerne un système comprenant un spectrophotomètre (7), un système à résonateur optique laser et un transducteur acousto-optique, une onde acoustique étant générée par un transducteur piézoélectrique (4) connecté à une source de signaux RF. Le transducteur acousto-optique constitue le composant final du système optique à résonateur. Entre la cavité résonnante et le transducteur acousto-optique, il y a un premier système optique de focalisation (5) qui focalise une onde lumineuse se propageant à l'intérieur du résonateur sur la surface avant d'un guide d'onde faisant partie du transducteur acousto-optique, le transducteur piézoélectrique (4) est fixé au guide d'onde du côté opposé à la surface avant formant une extension de l'axe optique du résonateur, tandis qu'entre un miroir de sortie (1) et le spectrophotomètre (7), il y a un autre système optique de focalisation (6) qui focalise le faisceau de lumière de sortie sur l'entrée du spectromètre (7).
EP13829016.8A 2013-01-27 2013-12-31 Système optique d'analyse de spectre d'ondes rf Withdrawn EP2948782A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL402565A PL222898B1 (pl) 2013-01-27 2013-01-27 Układ optyczny do analizy spektralnej widma fal radiowych
PCT/PL2013/000179 WO2014116130A1 (fr) 2013-01-27 2013-12-31 Système optique d'analyse de spectre d'ondes rf

Publications (1)

Publication Number Publication Date
EP2948782A1 true EP2948782A1 (fr) 2015-12-02

Family

ID=51227833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13829016.8A Withdrawn EP2948782A1 (fr) 2013-01-27 2013-12-31 Système optique d'analyse de spectre d'ondes rf

Country Status (3)

Country Link
EP (1) EP2948782A1 (fr)
PL (1) PL222898B1 (fr)
WO (1) WO2014116130A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11313930B1 (en) 2020-11-13 2022-04-26 Rohde & Schwarz Gmbh & Co. Kg Alternation pulsed double resonance detection scheme for gapless detection in atomic vapor quantum sensors

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928814A (en) * 1974-02-25 1975-12-23 Westinghouse Electric Corp Collinear acousto-optical tunable filter and acousto-optically tunable laser
US3996525A (en) * 1975-05-12 1976-12-07 The United States Of America As Represented By The Secretary Of The Navy Acousto-optically tuned laser
US4274049A (en) * 1979-08-28 1981-06-16 The United States Of America As Represented By The Secretary Of The Air Force Integrated optical R-F spectrum analyzer
JP2756967B2 (ja) * 1988-04-29 1998-05-25 浜松ホトニクス株式会社 スペクトル分析器
GB8923555D0 (en) * 1989-10-19 1989-12-06 Secr Defence Bragg cell analyser
JP2010186816A (ja) * 2009-02-10 2010-08-26 Sumitomo Electric Ind Ltd レーザ光源

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014116130A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11313930B1 (en) 2020-11-13 2022-04-26 Rohde & Schwarz Gmbh & Co. Kg Alternation pulsed double resonance detection scheme for gapless detection in atomic vapor quantum sensors

Also Published As

Publication number Publication date
WO2014116130A1 (fr) 2014-07-31
PL222898B1 (pl) 2016-09-30
PL402565A1 (pl) 2014-08-04

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