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Schilt, Stephane

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Schilt, Stephane
Affiliation principale
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Ancien.ne collaborateur.trice
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https://libra.unine.ch/handle/123456789/492

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  • Publication
    Accès libre
    Laser offset-frequency locking up to 20 GHz using a low-frequency electrical filter technique
    (2008)
    Schilt, Stephane 
    ;
    Matthey-De-L'Endroit, Renaud 
    ;
    Kauffmann-Werner, Daniela
    ;
    Affolderbach, Christoph 
    ;
    Mileti, Gaetano 
    ;
    Thévenaz, Luc
    A simple, easy-to-implement, and robust technique is reported to offset lock two semiconductor lasers with a frequency difference easily adjustable up to a couple of tens of gigahertz (10 and 19 GHz experimentally demonstrated). The proposed scheme essentially makes use of low-frequency control electronics and may be implemented with any type of single mode semiconductor laser, without any requirement for the laser linewidth. The technique is shown to be very similar to the wavelength modulation spectroscopy method commonly used for laser stabilization onto molecular absorption lines, as demonstrated by experimental results obtained using 935 nm laser diodes.
  • Publication
    Accès libre
    Frequency-stabilised laser reference system for trace-gas sensing applications from space
    (2006-6-27)
    Matthey-De-L'Endroit, Renaud 
    ;
    Affolderbach, Christoph 
    ;
    Mileti, Gaetano 
    ;
    Schilt, Stephane 
    ;
    Thévenaz, Luc
    A four-wavelength low-power continuous-wave frequency laser reference system has been realised in the 935.4-nm range for water vapour differential absorption lidar (DIAL) applications. The system is built around laboratory extended-cavity and DFB diode lasers. Three lasers are directly locked to three water vapour absorption lines of different strength, whereas the wavelength of the fourth laser lies out of any absorption line (offline). On-line stabilisation is performed by wavelength modulation spectroscopy technique, while precise offline stabilisation is realised by an offset locking at 18.8 GHz. Offset frequency larger than 320 GHz has also been demonstrated at 1.55 μm, based on an all-fibre optical frequency comb. First steps towards the use of a photonic crystal fibre as ultra compact reference cell with long optical pathlength were realised. The developed techniques for direct and offset-lock laser stabilisation can also be applied to other gases and wavelengths, provided the required optical components are available for the laser wavelength considered.
  • Publication
    Accès libre
    Diode laser frequency stabilisation for water vapour differential absorption sensing
    (2006-4-26)
    Matthey-De-L'Endroit, Renaud 
    ;
    Schilt, Stephane 
    ;
    Werner, Daniela
    ;
    Affolderbach, Christoph 
    ;
    Thévenaz, Luc
    ;
    Mileti, Gaetano 
    We describe a low-power continuous-wave laser system for water-vapour sensing applications in the 935-nm region. The system is based on extended-cavity diode lasers and distributed-feedback lasers and delivers four single-mode frequency-stabilised optical signals. Three lasers are locked to three water-vapour absorption lines of different strengths, whereas the fourth lies outside any absorption line. On-line stabilisation is performed by wavelength-modulation spectroscopy using compact water-vapour reference cells. An offset-locking technique implemented around an electrical filter is applied for the stabilisation of the off-line slave laser to an on-line master laser at a frequency detuning of 18.8 GHz. Stabilities in the order of 15 MHz over one day were observed for the strongest lines, at the detection limit of the measurement instrumentation. The developed techniques and schemes can be applied to other wavelength ranges and molecular species. Differential absorption lidar instrumentation can in particular benefit from such a system when the stabilised lasers serve as injection seeders to pulsed power oscillators.
  • Publication
    Accès libre
    Diode laser frequency stabilisation for water-vapour differential absorption sensing
    (2006)
    Matthey-De-L'Endroit, Renaud 
    ;
    Schilt, Stephane 
    ;
    Werner, D.
    ;
    Affolderbach, Christoph 
    ;
    Thévenaz, Luc
    ;
    Mileti, Gaetano 
    We describe a low-power continuous-wave laser system for water-vapour sensing applications in the 935-nm region. The system is based on extended-cavity diode lasers and distributed-feedback lasers and delivers four single-mode frequency-stabilised optical signals. Three lasers are locked to three water-vapour absorption lines of different strengths, whereas the fourth lies outside any absorption line. On-line stabilisation is performed by wavelength-modulation spectroscopy using compact water-vapour reference cells. An offset-locking technique implemented around an electrical filter is applied for the stabilisation of the off-line slave laser to an on-line master laser at a frequency detuning of 18.8 GHz. Stabilities in the order of 15 MHz over one day were observed for the strongest lines, at the detection limit of the measurement instrumentation. The developed techniques and schemes can be applied to other wavelength ranges and molecular species. Differential absorption lidar instrumentation can in particular benefit from such a system when the stabilised lasers serve as injection seeders to pulsed power oscillators.
  • Publication
    Accès libre
    All‑fiber versatile laser frequency reference at 2 μm for CO2 space‑borne lidar applications
    Schilt, Stephane 
    ;
    Matthey-De-L'Endroit, Renaud 
    ;
    Hey Tow, Kenny
    ;
    Thévenaz, Luc
    ;
    Südmeyer, Thomas 
    We present a frequency stabilized laser at 2051 nm based on a versatile all-fibered stabilization setup. A modulation sideband locking technique is implemented to lock the laser at a controlled frequency detuning from the center of the CO2 R(30) transition envisaged for space-borne differential absorption lidar (DIAL) applications. This method relies on the use of a compact all-fibered gas reference cell that makes the setup robust and immune to mechanically induced optical misalignments. The gas cell is fabricated using a hollow-core photonic crystal fiber filled with pure CO2 at a low pressure of ~20 mbar and hermetically sealed at both ends by splices to silica fibers. Different configurations of this fibered cell have been developed and are presented. With this technique, frequency stabilities below 40 kHz at 1-s integration time and <100 kHz up to 1000-s averaging time were achieved for a laser detuning by around 1 GHz from the center of the CO2 transition. These stabilities are compliant with typical requirements for the reference seed source for a space CO2 DIAL.