scholarly journals InAs-based interband-cascade-lasers emitting around 7 μm with threshold current densities below 1 kA/cm2 at room temperature

2015 ◽  
Vol 106 (4) ◽  
pp. 041108 ◽  
Author(s):  
Matthias Dallner ◽  
Florian Hau ◽  
Sven Höfling ◽  
Martin Kamp
Keyword(s):  
Room Temperature ◽  
Threshold Current ◽  
Current Densities ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

HIGH-PERFORMANCE INTERBAND CASCADE LASERS FOR λ = 3-4.5 μm

2012 ◽  
Vol 21 (01) ◽  
pp. 1250014 ◽  
Author(s):  
W. W. BEWLEY ◽  
C. S. KIM ◽  
M. KIM ◽  
I. VURGAFTMAN ◽  
C. L. CANEDY ◽  
...  
Keyword(s):  
High Performance ◽  
Single Mode ◽  
Threshold Current ◽  
Lasing Threshold ◽  
Threshold Power ◽  
Midwave Infrared ◽  
Current Densities ◽  
Lateral Modes ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

We discuss the single-mode performance characteristics of midwave-infrared interband cascade lasers. Broad-area devices with 5 active stages display pulsed threshold current densities as low as 375 A/cm2 and threshold power densities as low as 920 W/cm2 at room temperature, owing in part to the suppression of Auger recombination. Narrow ridges were processed using optical lithography to incorporate a periodically-corrugated pattern into the sidewalls. The corrugations are intended to suppress lasing in higher-order lateral modes, and also provide a 4th-order grating for distributed feedback. A corrugated-sidewall device operating at T = -20° C produced more than 46 mW of cw output in a single spectral mode, with a peak wallplug efficiency of 7.6%. The device maintains single-mode operation at current densities up to 10 times the lasing threshold, and the single-mode tuning range is 26 nm if both current and temperature are varied. Another device operating at -23°C produces up to 31 mW of single-mode power in the 3.3142-3.3164 μm range that spans several of the strongest absorption signature lines for methane.

Room temperature continuous wave interband cascade lasers for gas sensing

2012 ◽  
Author(s):  
S. Höfling ◽  
R. Weih ◽  
A. Bauer ◽  
M. Kamp ◽  
A. Forchel
Keyword(s):  
Room Temperature ◽  
Continuous Wave ◽  
Gas Sensing ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

scholarly journals Continuous-wave interband cascade lasers operating above room temperature at λ = 47-56 μm

2012 ◽  
Vol 20 (3) ◽  
pp. 3235 ◽  
Author(s):  
William W. Bewley ◽  
Chadwick L. Canedy ◽  
Chul Soo Kim ◽  
Mijin Kim ◽  
Charles D. Merritt ◽  
...  
Keyword(s):  
Room Temperature ◽  
Continuous Wave ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

scholarly journals Continuous-wave operation of vertically emitting ring interband cascade lasers at room temperature

2020 ◽  
Vol 116 (13) ◽  
pp. 131101 ◽  
Author(s):  
Hedwig Knötig ◽  
Borislav Hinkov ◽  
Robert Weih ◽  
Sven Höfling ◽  
Johannes Koeth ◽  
...  
Keyword(s):  
Room Temperature ◽  
Continuous Wave ◽  
Continuous Wave Operation ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

scholarly journals Photoacoustic Detection of Short-Chained Hydrocarbon Isotopologues

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 23
Author(s):  
Loh ◽  
Wolff
Keyword(s):  
Atmospheric Pressure ◽  
Room Temperature ◽  
Continuous Wave ◽  
Stable Carbon Isotope ◽  
Distributed Feedback ◽  
Light Sources ◽  
Photoacoustic Detection ◽  
Optoacoustic Spectroscopy ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

We report, to our knowledge, the first optical detection of the main isotopologues of short-chained hydrocarbons. The sensor system is based on photoacoustic (also known as optoacoustic) spectroscopy (PAS, OAS). This technique takes advantage of the fact that absorbed electromagnetic radiation is partially transferred into kinetic energy via inelastic molecular collisions. This is equivalent to a temperature increase of the irradiated volume. If the radiation is modulated, a pressure wave with an amplitude proportional to the concentration of the absorbing molecules is generated, the so called PA (OA) signal. Two continuous wave (cw), thermoelectrically cooled (TEC), distributed feedback interband cascade lasers (DFB-ICLs) with emission wavelengths around 3.33 and 3.38 μm, respectively, serve as light sources. The PA signal is detected with a microphone and phase-sensitively amplified. The new sensor is applied for the stable carbon isotope-selective analyses of methane (CH4), ethane (C2H6) and propane (C3H8). We report first measurements of 12C2H6, 13C12CH6 and 13C2H6 as well as of 12C3H8 and 13C12C2H8, all at approximate room temperature and atmospheric pressure. The listed isotopologues were selected because of their importance for numerous applications from atmospheric and planetary research to natural gas exploration.

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