A femtosecond pulse-shaping apparatus containing microlens arrays for use with pixellated spatial light modulators

1996 ◽  
Vol 32 (12) ◽  
pp. 2071-2077 ◽  
Author(s):  
K.M. Mahoney ◽  
A.M. Weiner
Keyword(s):  
Pulse Shaping ◽  
Femtosecond Pulse ◽  
Spatial Light Modulators ◽  
Microlens Arrays ◽  
Light Modulators

Femtosecond Pulse Shaping with Twisted-Nematic Liquid-Crystal Spatial-Light Modulators

1999 ◽  
Vol 38 (Part 1, No. 10) ◽  
pp. 5898-5904
Author(s):  
Toshiaki Hattori ◽  
Kouhei Kabuki ◽  
Yoshitsugu Kawashima ◽  
Masahiro Daikoku ◽  
Hiroki Nakatsuka
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Pulse Shaping ◽  
Femtosecond Pulse ◽  
Spatial Light Modulators ◽  
Light Modulators ◽  
Twisted Nematic ◽  
Twisted Nematic Liquid Crystal

scholarly journals How to optimize the absorption of two entangled photons

2021 ◽  
Vol 4 (4) ◽  
Author(s):  
Edoardo Carnio ◽  
Andreas Buchleitner ◽  
Frank Schlawin
Keyword(s):  
Pulse Shaping ◽  
Absorption Efficiency ◽  
Photon Absorption ◽  
Spatial Light Modulators ◽  
Schmidt Decomposition ◽  
Maximum Enhancement ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Light Modulators ◽  
Down Conversion

We investigate how entanglement can enhance two-photon absorption in a three-level system. First, we employ the Schmidt decomposition to determine the entanglement properties of the optimal two-photon state to drive such a transition, and the maximum enhancement which can be achieved in comparison to the optimal classical pulse. We then adapt the optimization problem to realistic experimental constraints, where photon pairs from a down-conversion source are manipulated by local operations such as spatial light modulators. We derive optimal pulse shaping functions to enhance the absorption efficiency, and compare the maximal enhancement achievable by entanglement to the yield of optimally shaped, separable pulses.

scholarly journals Microlens array enhanced upconversion luminescence at low excitation irradiance

Nanoscale ◽  
2019 ◽  
Vol 11 (29) ◽  
pp. 14070-14078 ◽  
Author(s):  
Qingyun Liu ◽  
Haichun Liu ◽  
Deyang Li ◽  
Wen Qiao ◽  
Guanying Chen ◽  
...  
Keyword(s):  
Nonlinear Response ◽  
Upconversion Luminescence ◽  
Microlens Array ◽  
Excitation Intensity ◽  
Spatial Light Modulators ◽  
Upconversion Nanoparticles ◽  
Microlens Arrays ◽  
Excitation Light ◽  
Light Modulators ◽  
Intensity Threshold

Microlens arrays are applied as spatial light modulators to manipulate the distribution of excitation light fields in order to overcome the high excitation-intensity threshold of upconversion nanoparticles, taking advantage of their nonlinear response to excitation irradiance.

Giant Anisotropy of Conductivity in Hydrogenated Nanocrystalline Silicon Thin Films

1998 ◽  
Vol 536 ◽  
Author(s):  
A. B. Pevtsov ◽  
N. A. Feoktistov ◽  
V. G. Golubev
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Percolation Theory ◽  
Nanocrystalline Silicon ◽  
Spatial Light Modulators ◽  
Light Emitting ◽  
Light Modulators ◽  
Silicon Thin Films ◽  
Longitudinal Conductivity ◽  
Transverse Conductivity

AbstractThin (<1000 Å) hydrogenated nanocrystalline silicon films are widely used in solar cells, light emitting diodes, and spatial light modulators. In this work the conductivity of doped and undoped amorphous-nanocrystalline silicon thin films is studied as a function of film thickness: a giant anisotropy of conductivity is established. The longitudinal conductivity decreases dramatically (by a factor of 109 − 1010) as the layer thickness is reduced from 1500 Å to 200 Å, while the transverse conductivity remains close to that of a doped a- Si:H. The data obtained are interpreted in terms of the percolation theory.

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