Ultrafast phase-resolved pump-probe measurements on a quantum cascade laser

2008 ◽  
Vol 93 (15) ◽  
pp. 151106 ◽  
Author(s):  
W. Kuehn ◽  
W. Parz ◽  
P. Gaal ◽  
K. Reimann ◽  
M. Woerner ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Pump Probe ◽  
Quantum Cascade ◽  
Probe Measurements

scholarly journals Pump-probe measurements of gain in a terahertz quantum cascade laser

2016 ◽  
Author(s):  
David R. Bacon ◽  
Joshua R. Freeman ◽  
Reshma A. Mohandas ◽  
Lianhe Li ◽  
Edmund H. Linfield ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Pump Probe ◽  
Quantum Cascade ◽  
Probe Measurements

In-situdiagnostics of hydrocarbon dusty plasmas using quantum cascade laser absorption spectroscopy and mass spectrometry

2014 ◽  
Vol 80 (6) ◽  
pp. 833-841 ◽  
Author(s):  
K. Ouaras ◽  
L. Colina Delacqua ◽  
G. Lombardi ◽  
J. Röpcke ◽  
M. Wartel ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Quantum Cascade Laser ◽  
Negative Ions ◽  
Dusty Plasmas ◽  
Qualitative Comparison ◽  
Quantum Cascade ◽  
Laser Absorption ◽  
Electrostatic Probe ◽  
Probe Measurements ◽  
Reaction Characteristic

The formation of carbon nanoparticles in low pressure magnetized H2/CH4and H2/C2H2plasmas is investigated using infrared quantum cascade laser absorption, mass spectrometry, and electrostatic probe measurements. Results showed that dust formation is correlated to the presence of a significant amount of large positively charged hydrocarbon ions. Large negative ions or neutral hydrocarbon were not observed. These results, along with a qualitative comparison of diffusion and reaction characteristic, suggest that a positive ion may contribute to the growth of nanoparticles in hydrocarbon magnetized plasmas.

scholarly journals Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy

2012 ◽  
Vol 112 (3) ◽  
pp. 033517 ◽  
Author(s):  
Axel Bruchhausen ◽  
James Lloyd-Hughes ◽  
Mike Hettich ◽  
Raphael Gebs ◽  
Martin Grossmann ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Acoustic Phonons ◽  
Pump Probe ◽  
Quantum Cascade ◽  
Probe Spectroscopy ◽  
Coherent Acoustic Phonons

Pump-Probe Measurements Using Silicon Nanocrystal Waveguides

2003 ◽  
Vol 770 ◽  
Author(s):  
Nathanael Smith ◽  
Max J. Lederer ◽  
Marek Samoc ◽  
Barry Luther-Davies ◽  
Robert G. Elliman
Keyword(s):  
Probe Beam ◽  
Time Resolution ◽  
Pump Beam ◽  
Silicon Nanocrystals ◽  
Continuous Wave ◽  
Optical Gain ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Measurements

AbstractOptical pump-probe measurements were performed on planar slab waveguides containing silicon nanocrystals in an attempt to measure optical gain from photo-excited silicon nanocrystals. Two experiments were performed, one with a continuous-wave probe beam and a pulsed pump beam, giving a time resolution of approximately 25 ns, and the other with a pulsed pump and probe beam, giving a time resolution of approximately 10 ps. In both cases the intensity of the probe beam was found to be attenuated by the pump beam, with the attenuation increasing monotonically with increasing pump power. Time-resolved measurements using the first experimental arrangement showed that the probe signal recovered its initial intensity on a time scale of 45-70 μs, a value comparable to the exciton lifetime in Si nanocrystals. These data are shown to be consistent with an induced absorption process such as confined carrier absorption. No evidence for optical gain was observed.

scholarly journals High-speed operation of single-mode tunable quantum cascade laser based on ultra-short resonant cavity

AIP Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 015325
Author(s):  
Yuhong Zhou ◽  
Junqi Liu ◽  
Shenqiang Zhai ◽  
Ning Zhuo ◽  
Jinchuan Zhang ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
High Speed ◽  
Resonant Cavity ◽  
Single Mode ◽  
Quantum Cascade

scholarly journals Giant Photoluminescence Enhancement and Carrier Dynamics in MoS2 Bilayers with Anomalous Interlayer Coupling

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1994
Author(s):  
Han Li ◽  
Yating Ma ◽  
Zhongjie Xu ◽  
Xiang’ai Cheng ◽  
Tian Jiang
Keyword(s):  
Optical Properties ◽  
Transition Metal Dichalcogenides ◽  
Interlayer Coupling ◽  
Carrier Dynamics ◽  
Probe Signal ◽  
Exciton Resonance ◽  
Pump Probe ◽  
Metal Dichalcogenides ◽  
Photoluminescence Enhancement ◽  
Probe Measurements

Fundamental researches and explorations based on transition metal dichalcogenides (TMDCs) mainly focus on their monolayer counterparts, where optical densities are limited owing to the atomic monolayer thickness. Photoluminescence (PL) yield in bilayer TMDCs is much suppressed owing to indirect-bandgap properties. Here, optical properties are explored in artificially twisted bilayers of molybdenum disulfide (MoS2). Anomalous interlayer coupling and resultant giant PL enhancement are firstly observed in MoS2 bilayers, related to the suspension of the top layer material and independent of twisted angle. Moreover, carrier dynamics in MoS2 bilayers with anomalous interlayer coupling are revealed with pump-probe measurements, and the secondary rising behavior in pump-probe signal of B-exciton resonance, originating from valley depolarization of A-exciton, is firstly reported and discussed in this work. These results lay the groundwork for future advancement and applications beyond TMDCs monolayers.

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