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ABSTRACT: Type-I quantum-well laser diodes with an active region constituted of GaInAsSb-AlGaInAsSb are reported. Broad-area lasers have demonstrated a threshold current density of 255 A/cm<sup>2</sup> at room temperature. Distributed-feedback lasers have been operated in the continuous-wave regime at 20°C with a wavelength of 3.06 μm, a threshold current of 54 mA, and an output power of 6 mW.
IEEE Photonics Technology Letters 09/2010; · 2.19 Impact Factor
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ABSTRACT: The photothermal deflection technique, also known as "mirage effect", is a nondestructive method of evaluating thermal properties of solid, liquid or gaseous species. This technique will be used to detect pollutant absorption. As the deflection is stronger in liquids than gases, we will first consider the deflection in paraffin oil. We consider a medium that is heated by a modulated laser diode beam, and we measure the deflection of the probe beam passing through the heated region as a function of the distance between the axes of the beams. After some theoretical considerations and numerical simulations, we present the application of this method to the experimental determination of the thermal diffusivity of a liquid sample in excellent agreement with previously known values.
Journal of Physics Conference Series 04/2010; 214(1):012121.
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ABSTRACT: Long wavelength GaInAsSb/AlGaAsSb quantum wells lasers have been grown by molecular beam epitaxy and processed into ridge cavities coupled by an intracavity photonic crystal mirror, to enhance the laser spectral properties. The devices operate in the continuous-wave regime at room temperature with a single frequency emission at 2.6 m.
Electronics Letters 11/2009; · 0.96 Impact Factor
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ABSTRACT: We report on Fabry–Pérot semiconductor lasers and single frequency distributed feedback lasers based on GaInAsSb/AlGaAsSb
quantum wells. The laser structures were grown by molecular beam epitaxy on GaSb substrates. The devices were etched either
by wet process or by inductively coupled plasma (ICP) process. Electron-beam lithography was used to deposit a metal Bragg
grating on each side of the laser ridge to fabricate the DFB lasers. The devices all operate in the continuous wave regime
at room temperature with a single frequency emission above 2.6μm and good tuning properties, making them well adapted to
tunable diode laser absorption spectroscopy.
Applied Physics B 01/2008; 90(2):201-204. · 2.19 Impact Factor
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ABSTRACT: The mid-infrared 2-2.7 mum region of the electromagnetic spectrum is attractive for trace gas sensing owing to the presence of strong absorption bands of several species of industrial interest and is also well adapted to water measurements and isotopic ratio studies. However, single-frequency and continuously tunable emission is required, thus distributed feedback (DFB) laser diodes are well suited for these gas sensing applications. The low gap materials used give access to the mid-infrared wavelength range (lambda > 2 mum). In recent years, impressive results were obtained on DFB lasers above in this wavelength range with an emission at 2.55 mum and at 2.74 mum. In this Letter, we focus, for the first time to our knowledge, on the fabrication and characterisation of DFB devices operating between 2.6-2.65 mum dedicated to water measurement.
Electronics Letters 02/2007; · 0.96 Impact Factor
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Semiconductor Lasers and Laser Dynamics II, Strasbourg, France; 04/2006
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S. Civiš,
V. Horká,
J. Cihelka,
T. Šimeček,
E. Hulicius,
J. Oswald,
J. Pangrác, A. Vicet,
Y. Rouillard,
A. Salhi,
C. Alibert,
R. Werner,
J. Koeth
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ABSTRACT: We describe results obtained with a new type of GaSb-based semiconductor distributed feedback multiple quantum well lasers
operating in continuous-wave mode at room temperature and above. The lasers show good tunability both by the excitation current
and the temperature from -1°C to +60°C (4170 to 4360cm-1). They operate in a high-power (more than 1mW) single-mode regime and can be tuned without hopping in the methane and ammonia
absorption spectral range of up to 15cm-1. Application to photoacoustic detection is also described. Potential use lies in the areas of analytical chemistry of gases
and in atmospheric pollution research.
Applied Physics B 09/2005; 81(6):857-861. · 2.19 Impact Factor
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R. Teissier,
D. Barate, A. Vicet,
C. Alibert,
A. N. Baranov,
X. Marcadet,
C. Renard,
M. Garcia,
C. Sirtori,
D. Revin,
J. Cockburn
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ABSTRACT: The room temperature operation of InAs / AlSb quantum cascade lasers is reported. The structure, grown by molecular beam epitaxy on an InAs substrate, is based on a vertical transition design and a low loss n<sup>+</sup>- InAs plasmon enhanced waveguide. The lasers emitting near 4.5 μ m operate in pulse regime up to 300 K . The threshold current density of 3.18- mm -long lasers is 1.5 kA / cm <sup>2</sup> at 83 K and 9 kA / cm <sup>2</sup> at 300 K .
Applied Physics Letters 08/2004; · 3.84 Impact Factor
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D. G. Revin,
L. R. Wilson,
D. A. Carder,
J. W. Cockburn,
M. J. Steer,
M. Hopkinson,
R. Airey,
M. Garcia,
C. Sirtori,
Y. Rouillard,
D. Barate, A. Vicet
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ABSTRACT: We present a Fabry–Pérot resonator technique for room temperature optical loss measurements on mid-infrared (λ∼2–4 μm) lasers. The quality of optical waveguides for λ≈2.3 μm InGaAsSb/AlGaAsSb/GaSb interband lasers and a λ≈3.7 μm strain-compensated InGaAs/InAlAs/InP quantum cascade laser have been estimated using this method. The optical losses for these lasers lie in the range 15–25 cm−1 for interband lasers and 4–5 cm−1 (transverse electric polarization) and 21–23 cm−1 [transverse magnetic (TM) polarization] for the quantum cascade laser. The considerably higher losses for TM polarization in the case of quantum cascade laser are explained by intersubband absorption in the active layers. The method may be applied to structures with only a minimum amount of device processing, facilitating rapid progress in development of mid infrared laser designs in new materials systems. © 2004 American Institute of Physics.
Journal of Applied Physics 06/2004; 95(12):7584-7587. · 2.17 Impact Factor
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ABSTRACT: Double quantum well laser diodes based on the GaInAsSb/AlGaAsSb system emitting at 2.61 μm in continuous-wave regime have been fabricated. In the pulsed regime for a 100 μm-wide 1600 μm-long device a record threshold current density of 76 A/cm<sup>2</sup> per quantum well was obtained.
Electronics Letters 05/2004; · 0.96 Impact Factor
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ABSTRACT: Quantum cascade lasers based on the InAs/AlSb material system have been realised. The optical confinement is obtained using a plasmon waveguide with n<sup>+</sup>-InAs cladding layers. In pulse mode the lasers emit close to 6.7 μm with a threshold current density of 5 kA/cm<sup>2</sup> at 90 K. The maximum operating temperature is 220 K.
Electronics Letters 09/2003; · 0.96 Impact Factor
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ABSTRACT: A study of the effects of the injected current and the thermal resistance on the tunability of antimonide-based diode lasers is presented. The studied diode lasers, emitting at around 2.3 μm, are dedicated to gas detection in the atmosphere, based on tunable-diode-laser absorption spectroscopy (TDLAS). This very useful technique requires, from the lasers, an emitted tunable wavelength able to cross a gas absorption line to detect the absorbed light. Typically a tuning rate of a few GHz/mA is sufficient to perform gas detection at atmospheric pressure (Vicet et al., 2002). It is then important to know and understand the tuning properties of the devices to achieve gas detection. They are very sensitive to thermal effects which are involved in all tuning processes. The lasers studied are shown to be well adapted to gas detection, paradoxically because of their large thermal resistance R<sub>th</sub> which increases Joule heating, and mainly affects their tunability.
IEE Proceedings - Optoelectronics 09/2003; · 0.71 Impact Factor
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ABSTRACT: The wavelength range between 2 and 5 μm is of main interest for molecular spectroscopy and environmental monitoring. The 2.2-2.3 μm spectral region is a window for water vapor and CO<sub>2</sub> absorption while absorption lines of some atmospheric pollutants are very strong. One of the most sensitive techniques for selective gas analysis is tunable diode laser absorption spectroscopy (TDLAS). To reduce the cost and dimensions of the equipment, single frequency diode lasers and detectors operating in continuous wave (CW) regime at room temperature (RT) or above are required in this spectral range. In this contribution we summarize the results obtained in the development of 6.1 angstrom semiconductors diode lasers and their applications for trace gas detection. The laser structures were grown by molecular beam epitaxy on GaSb substrates. To estimate the spectral quality of the laser, emission mode maps of the lasers have been performed using a Fabry-Perot interferometer or directly absorption lines of gases of interest. We present some results on TDLAS of methane, carbon monoxide, carbon dioxide, and HF in trace concentrations, obtained with the GaSb diode lasers used in the CW regime at temperatures up to 800°C.
Lasers and Electro-Optics Society, 2002. LEOS 2002. The 15th Annual Meeting of the IEEE; 12/2002
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ABSTRACT: Widely tunable GaInAsSb/AlGaAsSb quantum well (QW) lasers have been grown by molecular beam epitaxy on GaSb substrates. Their emission wavelength, from 2.0 to 2.5 microm, make them suitable for the detection of many gas species in the wavelength range which corresponds to an atmospheric transmission window. Using these devices an experimental setup for open path gas detection has been developed.
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 10/2002; 58(11):2405-12. · 2.10 Impact Factor
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ABSTRACT: Summary form only. The wavelength range between 2.2 and 2.4 μm are of great interest for molecular spectroscopy and environmental monitoring. Tunable diode laser absorption spectroscopy is one of the most accurate techniques for gas analysis and to reduce the cost of the equipment diode lasers operating in continuous wave (cw) regime above room temperature (RT) are required. In this contribution we present single mode GaInSbAs-GaAlSbAs QW lasers operating in cw regime up to 130°C
Lasers and Electro-Optics Europe, 2000. Conference Digest. 2000 Conference on; 10/2000
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ABSTRACT: Novel GaInAsSb/GaSb multiple quantum well lasers grown by
molecular beam epitaxy have successfully operated in continuous wave
around 2.35 μm at room temperature. The temperature and current
tuning properties have been characterised by tunable diode laser
absorption spectroscopy. These optical properties allowed a wide
spectral scan from 2.27 μm to 2.36 μm. Experiments of gas
absorption have been carried out in direct absorption measurements in
continuous wave regime. From the point of view of trace gas analysis,
wavelength modulation has been successfully performed at 19°C around
2.36 μm. An external cavity has then been added to the setup to
obtain monomodal emission. These appealing results are very attractive
for portable low-cost and room temperature trace pollutants analysis
IEE Proceedings - Optoelectronics 07/2000; · 0.71 Impact Factor
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D A Yarekha, A Vicet,
A Perona,
G Glastre,
B Fraisse,
Y Rouillard,
E M Skouri,
G Boissier,
P Grech,
A Joullié,
C Alibert,
A N Baranov
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ABSTRACT: Narrow ridge GaInSbAs/GaSb type-II QW lasers emitting at 2.37-2.4 µm have been fabricated. The lasers operated in the cw regime at room temperature with the output optical power up to 20 mW/facet. The internal quantum efficiency of the lasers was found to be 89% and the power efficiency reached 20%. The lasers emitted in the fundamental spatial mode and exhibited single frequency operation in a large range of currents and temperatures. The emission wavelength could be continuously tuned by current over 0.7-1.2 nm. The single longitudinal mode behaviour was explained by the photorefractive effect due to DX centres in the Te-doped GaAlSbAs cladding layer acting as a saturable absorber.
Semiconductor Science and Technology 03/2000; 15(4):390. · 1.72 Impact Factor
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ABSTRACT: There is a need for low-cost and portable equipment. The exigency in terms of the sensitivity lies around the 1 ppm level. Tunable diode laser spectroscopy (TDLAS) appears to be the best candidate to fulfill these requirements. To be performed in good conditions TDLAS needs the laser to be operated in continuous mode. Unfortunately there is presently no semiconductor laser able to operate in cw mode beyond 2.7 μm at room temperature. We try to overcome this problem
Laser and Fiber-Optical Networks Modeling, 2000. Proceedings of LFNM 2000. 2nd International Workshop on; 02/2000
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[show abstract]
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ABSTRACT: Widely tunable GaInAsSb/AlGaAsSb quantum well (QW) lasers have been grown by molecular beam epitaxy on GaSb substrates. Their emission wavelength, from 2.0 to 2.5 μm, make them suitable for the detection of many gas species in the wavelength range which corresponds to an atmospheric transmission window. Using these devices an experimental setup for open path gas detection has been developed.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy.
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