SEMICONDUCTOR LASERS FOR EFFICIENT AND RELIABLE CW OPERATION IN THE MID- AND FAR-INFRARED: INTERSUBBAND QUANTUM-BOX LASERS

2007 ◽  
Vol 06 (03n04) ◽  
pp. 203-207 ◽  
Author(s):  
DAN BOTEZ
Keyword(s):  
Semiconductor Lasers ◽  
Room Temperature ◽  
Far Infrared ◽  
Single Stage ◽  
Preliminary Results ◽  
Quantum Cascade ◽  
Cw Operation ◽  
2D Arrays ◽  
Nanoscale Level

Intersubband quantum-box (IQB) lasers, that is, devices consisting of 2D arrays of single-stage intersubband QB emitters, are proposed, as an alternative to 30-stage quantum-cascade (QC) devices, as sources for efficient room-temperature (RT) emission in the mid- and far-IR (3–5 and 8–12 μm) wavelength ranges. Preliminary results include: (1) the realization of the first mid-IR (λ = 4.7 μ m ) single-stage emitters operating at RT; (2) etch-and-regrowth at the nanoscale level by employing in situ gas etching and MOCVD regrowth; (3) the formation of 30 nm-diameter SiO 2 posts on 80 nm centers, thus forming the mask for the fabrication of IQBs via in situ etch and regrowth.

Photoacoustic spectroscopy for trace gas detection with cryogenic and room-temperature continuous-wave quantum cascade lasers

Open Physics ◽  
2010 ◽  
Vol 8 (2) ◽  
Author(s):  
Virginie Zeninari ◽  
Agnès Grossel ◽  
Lilian Joly ◽  
Thomas Decarpenterie ◽  
Bruno Grouiez ◽  
...  
Keyword(s):  
Detection Limit ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Gas Detection ◽  
Trace Gas ◽  
Atmospheric Gases ◽  
Trace Gas Detection ◽  
Quantum Cascade ◽  
Cascade Lasers

AbstractThe main characteristics that a sensor must possess for trace gas detection and pollution monitoring are high sensitivity, high selectivity and the capability to perform in situ measurements. The photacoustic Helmholtz sensor developed in Reims, used in conjunction with powerful Quantum Cascade Lasers (QCLs), fulfils all these requirements. The best cell response is # 1200 V W−1 cm and the corresponding ultimate sensitivity is j 3.3 × 10−10 W cm−11 Hz−11/2. This efficient sensor is used with mid-infrared QCLs from Alpes Lasers to reach the strong fundamental absorption bands of some atmospheric gases. A first cryogenic QCL emitting at 7.9 μm demonstrates the detection of methane in air with a detection limit of 3 ppb. A detection limit of 20 ppb of NO in air is demonstrated using another cryogenic QCL emitting in the 5.4 μm region. Real in-situ measurements can be achieved only with room-temperature QCLs. A room-temperature QCL emitting in the 7.9 μm region demonstrates the simultaneous detection of methane and nitrous oxide in air (17 and 7 ppb detection limit, respectively). All these reliable measurements allow the estimated detection limit for various atmospheric gases using quantum cascade lasers to be obtained. Each gas absorbing in the infrared may be detected at a detection limit in the ppb or low-ppb range.

Room-temperature CW operation of (lambda~9 μm) InP-based quantum cascade lasers

2004 ◽  
Author(s):  
Sebastien Forget ◽  
Clemont Faugeras ◽  
Elizabeth Boer Duchemin ◽  
Jean-Yves Bengloan ◽  
Carlo Sirtori ◽  
...  
Keyword(s):  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Quantum Cascade ◽  
Cw Operation ◽  
Cascade Lasers

scholarly journals Long Wavelength (λ > 17 µm) Distributed Feedback Quantum Cascade Lasers Operating in a Continuous Wave at Room Temperature

Photonics ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 31 ◽  
Author(s):  
Hoang Nguyen Van ◽  
Zeineb Loghmari ◽  
Hadrien Philip ◽  
Michael Bahriz ◽  
Alexei Baranov ◽  
...  
Keyword(s):  
Semiconductor Lasers ◽  
Room Temperature ◽  
Continuous Wave ◽  
Quantum Cascade Lasers ◽  
Molecular Spectroscopy ◽  
Single Mode ◽  
Distributed Feedback ◽  
Long Wavelength ◽  
Quantum Cascade ◽  
Cascade Lasers

The extension of the available spectral range covered by quantum cascade lasers (QCL) would allow one to address new molecular spectroscopy applications, in particular in the long wavelength domain of the mid-infrared. We report in this paper the realization of distributed feedback (DFB) QCLs, made of InAs and AlSb, that demonstrated a continuous wave (CW) and a single mode emission at a wavelength of 17.7 µm, with output powers in the mW range. This is the longest wavelength for DFB QCLs, and for any QCLs or semiconductor lasers in general, operating in a CW at room temperature.

Functionalisation of CdSe and GaAs Quantum Dots

1999 ◽  
Vol 581 ◽  
Author(s):  
Sebastian J. Nørager ◽  
Michael Lazell ◽  
Paul O'Brien
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Carboxylic Acids ◽  
Pyridine Derivatives ◽  
Mercaptopropionic Acid ◽  
Preliminary Results ◽  
2D Arrays

ABSTRACTIn this communication we report the preliminary results of in-situ functionalisation, of Q-CdSe and Q-GaAs using thiols, (HSC12H25), dithiols, (HSC9H18SH), pyridine derivatives (4-ethylpyridine, 4-butylpyridine) and carboxylic acids (mercaptopropionic acid).The functionalisation of the capping group provides a potential route to the assembly of 2D arrays and supperlattices. Anchorage of the nanocrystals to surfaces for use in devices, such as solar cells and Grätzel type cells is also discussed.

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