Two-photon absorption and lasing in polyfluorene
Absorption cross sections of hole polarons in glassy and beta phase polyfluorene
... polaron. Absorption of light and fluorescence quenching by polarons are important issues in the operation of organic optoelectronic ...the lasing threshold of or- ganic structures under optical pumping is ...
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Ultralow-threshold up-converted lasing in oligofluorenes with tailored strong nonlinear absorption
... a two- photon absorption cross-section as high as 2200 GM, which is comparable to that of linear conjugated ...show two-photon absorption pumped amplified spontaneous emission ...
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Two photon absorption in semiconductor micro cavities
... into two beams and after one beam has been temporally delayed the beams from both arms of the interferometer are recombined at the ...the two co-parallel beams can be ...the two parallel beams ...
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Towards Heralded Two-Photon Absorption and Two-Photon Excited Fluorescence for Quantum Microscopy and Spectroscopy
... a photon pair is heralded at the SFG ...the two paths requires an additional tunable optical delay line to provide fine tuning ability of any optical path length difference between the two ...the ...
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Generation of Nonclassical Light by Unsaturated Two Photon Absorption
... to two-photon absorption (TPA) and the fac- tors that contribute to squeezing and antibunching of photons, leading to the generation of nonclassical ...absorbing two photons si- ...initial ...
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Two photon absorption based detection in semiconductor microcavities
... 5. Influence of limited cavity acceptance angle 5 .1 In flu e n c e o f acceptance angle In order for TPA based detection schemes to be considered for use it must be cost effective. In practice this means that the device ...
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Mid-infrared two photon absorption sensitivity of commercial detectors
... power, two-photon GaAs/InGaAs quantum well infrared photodetectors (2P-QWIP) have been ...adequate two-photon absorption (TPA) sensitivity, whereas the second harmonic conversion ...
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Photoluminescence upconversion at interfaces driven by a sequential two-photon absorption mechanism
... the two beams were coincident at the same spot on the ...a photon energy of ...the two upconversion PL spectra demonstrate that the unchopped beam provided additional UPL signal, with a peak ...
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Polarization dependence of a GaAs based two photon absorption microcavity photodetector
... 1. These scans were carried out with the average power held constant at 0.15 mW, which is low enough for the detected photocurrent to be dominated by SPA, as shown in Fig. 2(inset), which shows the microcavity detector ...
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Evaluation of the two-photon absorption characteristics of GaSb/GaAs quantum rings
... be two-photon excitation, whereby a combination of photo-filling (IB to CB transitions) and emp- tying (VB to IB transitions) of the QR states results in the photo-generation of electron-hole ...Although ...
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Multi photon absorption limits to heralded single photon sources
... probabilistic photon generation with multi-photon processes in both the generation and collection of single photons for the first ...of photon pairs generated from spontaneous four-wave mixing in ...
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Femtosecond two-photon absorption spectroscopy of poly(fluorene) derivatives containing benzoselenadiazole and benzothiadiazole
... Materials 2017, 10, 512 9 of 11 to an ICT transition. The later one is also observed along to the one-photon absorption spectrum due to the relaxation of the electric dipole selection rules in ...
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Enhanced two-photon absorption of ligated silver and gold nanoclusters: theoretical and experimental assessments
... Since the pioneering work of Goodson and co-workers 49 , who were the first to reveal giant TPA cross-sections for Au 25 (SR) 18 nanoclusters, several works have been reported on the two- photon ...
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Two Photon Absorption in Nanostructure Wide Band Gap Semiconductor CdS Using Femtosecond Laser
... nonlinear absorption in CdS nanoparticles of dimensions in the range 4 - 50 nm when irradiated with a femtosecond pulsed laser at 800 nm is ...nonlinear absorption coeffi- cients were measured using a fully ...
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All optical sampling based on two photon absorption in a semiconductor microcavity for high speed OTDM
... Keywords: Optical Communications, Optical Time Division Multiplexing, Hybrid WDM/OTDM, Optical Sampling, Two-Photon Absorption, Microcavity 1. HIGH-SPEED OPTICAL MULTIPLEXING TECHNIQUES Due to the ...
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Chromatic dispersion monitoring for high speed WDM systems using two photon absorption in a semiconductor microcavity
... VIII. C ONCLUSION In this paper, a theoretical and experimental investigation on the use of a TPA-based microcavity for CD monitoring in a high- speed, multi-wavelength optical communications system is pre- sented. As ...
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Competition between sub-bandgap linear detection and degenerate two-photon absorption in gallium arsenide photodiodes
... Our first experimental setup aims at investigating the pro- cesses responsible for the sub-bandgap response of several Optowell PP85-B1T0N GaAs PIN photodiode. The ball lens covering the detector has been removed, in ...
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Simultaneous two-photon imaging and two-photon optogenetics of cortical circuits in three dimensions
... C- Minimizing Cross-talk between Imaging and Photostimulation Another important consideration in our all-optical method was to minimize the cross-talk between imaging and photostimulation. We chose the calcium indicator ...
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Theory of direct and indirect effect of two-photon absorption on nonlinear optical losses in high power semiconductor lasers
... The results imply therefore that there is a design of the laser waveguide (the active layer position l a ) that would be near enough to the optimal position for high-power operation in a broad range of currents. This is ...
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Acceptance angle influence on optimum incident spot size for high finesse microcavity two photon absorption photodetectors
... , which gives a value of which is 0.963. This corresponds to a cavity finesse of 85.4 and a FSR of 168.3 nm. The spectra in Fig. 4 are normalized to the peak photocurrent and their wavelength axis shifted to centre their ...
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