scholarly journals External Switching Dynamics of Optical Bistability System Simulation

2020 ◽  
pp. 1027-1031
Author(s):  
Ali Hassan Khidhir
Keyword(s):  
Optical Bistability ◽  
System Simulation ◽  
Input Pulse ◽  
External Source ◽  
External Input ◽  
Bistable System ◽  
Switching Dynamics ◽  
Mirror Reflectivity ◽  
Fabry Perot ◽  
Set Up

In this work, the external switching dynamics of a Fabry-Perot etalon are studied via optical bistability system simulation. The simulated set-up of this investigation consists of two laser beams; the first beam is continuous (CW) which is considered as a biasing beam and capable of holding the bistable system for a certain range, which we are interested in, from a point that is very close self-switching to a point where the switching is unachievable. The second beam is modulated by passing the first beam through an acousto-optic modulator (AOM) to produce pulses with a minimum rise time and is used as an external source (coherent switching). In this work, we obtained the optical bistable loops by applying absorption coefficient (α) = 20cm-1, e sample etalon thickness (D) = 110μm, forward mirror reflectivity (Rf) = 0.6, and backward mirror reflectivity (Rb) = 0.95. The steady state characteristic of an initial detuning of the cavity (φ0) = 0.8 was studied at the conditions of no external input pulse intensity (M(t) = 0) and switching that takes place at Is(ON)= 0.57mW and Is(OFF) = 0.4mW.

Demonstration of Dispersive Optical Bistability With a Third Order Nonlinear Optically Active Polymer

1993 ◽  
Vol 328 ◽  
Author(s):  
Mark A. Druy ◽  
Guang S. He ◽  
Martin K. Casstevens ◽  
Ryszard Burzynski
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Optical Bistability ◽  
Input Pulse ◽  
Refractive Index Change ◽  
Environmental Stability ◽  
Third Order ◽  
Optical Polymer ◽  
Fabry Perot ◽  
Bistable Device

ABSTRACTDispersive optical bistability in a Fabry-Perot (F-P) cavity with a third order nonlinear optical polymer was demonstrated. This effort involved the development of several nonlinear optical polyimides and an evaluation of their linear optical and nonlinear optical properties. These Materials were processed into waveguiding films having good homogeniety and optical properties. Several of these films were shown to have desirable third order nonlinearities, while exhibiting good mechanical and environmental stability. Characterization of these materials involved the measurement of their absorption profiles, film thicknesses, optical waveguide propagation constants and nonlinear optical susceptibilities. Based on the measured results, a specific polyimide was chosen and used to demonstrate an all-optical instrinsic bistable device operating at a wavelength of 1.06 μ. Using ∼ 100 ps input pulse widths at 1.06 μ, dispersive optical bistability originating from the induced refractive index change, δn, due to an electronic nonlinearity of the polyimide was observed.

Mode profiles and Airy distributions of Fabry-Pérot resonators with frequency-dependent mirror reflectivity

2017 ◽  
Author(s):  
Nur Ismail ◽  
Cristine Calil Kores ◽  
Dimitri Geskus ◽  
Markus Pollnau
Keyword(s):  
Frequency Dependent ◽  
Mirror Reflectivity ◽  
Fabry Perot

Incorporating optical bistability into a magnetically bistable system: a photochromic redox isomeric complex

2009 ◽  
pp. 5424 ◽  
Author(s):  
Michelle M. Paquette ◽  
Roni A. Kopelman ◽  
Elvira Beitler ◽  
Natia L. Frank
Keyword(s):  
Optical Bistability ◽  
Bistable System ◽  
System A

Transverse optical bistability and formation of transverse structures in a sodium-filled Fabry-Pérot resonator

1992 ◽  
Vol 45 (7) ◽  
pp. R4237-R4240 ◽  
Author(s):  
J. Nalik ◽  
L. M. Hoffer ◽  
G. L. Lippi ◽  
Ch. Vorgerd ◽  
W. Lange
Keyword(s):  
Optical Bistability ◽  
Transverse Optical ◽  
Fabry Perot

Optical bistable switching in pyran dye-doped polymers

2014 ◽  
Vol 23 (02) ◽  
pp. 1450018 ◽  
Author(s):  
Purnima ◽  
Devendra Mohan
Keyword(s):  
Solid State ◽  
Communication Systems ◽  
Optical Bistability ◽  
Nonlinear Refraction ◽  
Nonlinear Behavior ◽  
Single Mode ◽  
Third Order ◽  
Bistable Switching ◽  
Fabry Perot ◽  
Doped Polymers

In the present frame of work, optical bistability using a Fabry–Perot (FP) cavity containing 4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4H-pyran (DCM) dye entrapped in poly-methylmethacrylate (PMMA) matrix is experimentally investigated. Optical nonlinear behavior of solid-state samples is studied using a single-mode Q-switched nanosecond Nd:YAG laser operating at 532 nm. Various optical nonlinear parameters such as nonlinear refractive index (n2) and third-order susceptibility (χ3) of the material are numerically estimated from bistability loops. The origin of optically bistable behavior is attributed to photoisomerization-assisted nonlinear refraction phenomenon. It is observed that nonlinear refraction dominates over nonlinear absorption in giving rise to the optical bistability. The study shows that DCM dye entrapped in solid-state matrices are promising candidate for polymer-based optical switches, data processing, and communication systems.

scholarly journals Boosting Self-interaction of Molecular Vibrations under Ultra-strong Coupling Condition

2021 ◽  
Author(s):  
Akhila Kadyan ◽  
Anil Shaji ◽  
Jino George
Keyword(s):  
Oscillator Strength ◽  
Strong Coupling ◽  
Cavity Mode ◽  
Linear Increase ◽  
Vacuum Field ◽  
New Paradigm ◽  
Coupling Condition ◽  
Field Coupling ◽  
Fabry Perot ◽  
Set Up

In this letter, we investigated the modification of oscillator strength of an asymmetric stretching band of CS<sub>2</sub> by strong coupling to an infrared cavity photon. This is achieved by placing liquid CS<sub>2</sub> in a Fabry-Perot resonator and tune the cavity mode position to match with the molecular vibrational transition. Ultra-strong coupling improves the self-interaction of transition dipoles of asymmetric stretching band of CS<sub>2</sub> that resulted in an increase of its own oscillator strength. We experimentally proved this by taking the area ratio of asymmetric stretching and combination band by selectively coupling the former one. A non-linear increase in the oscillator strength of the asymmetric stretching band is observed upon varying the coupling strength. This is explained by a quantum mechanical model that predicts quadratic behavior under ultra-strong coupling condition. These findings will set up a new paradigm for understanding chemical reaction modification by vacuum field coupling.

scholarly journals Temperature Control for an Intra-Mirror Etalon in Interferometric Gravitational Wave Detector Fabry–Perot Cavities

Galaxies ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 80
Author(s):  
Jonathan Brooks ◽  
Maddalena Mantovani ◽  
Annalisa Allocca ◽  
Julia Casanueva Diaz ◽  
Vincenzo Dattilo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Gravitational Wave ◽  
Temperature Control ◽  
Optical Path Length ◽  
Heat Transfer Process ◽  
Index Of Refraction ◽  
Mirror Reflectivity ◽  
Fabry Perot ◽  
Input Test ◽  
Etalon Fringe

The sensitivity of interferometric gravitational wave detectors is optimized, in part, by balanced finesse in the long Fabry–Perot arm cavities. The input test mass mirrors of Advanced Virgo feature parallel faces, which creates an etalon within the substrate, adding variability in the total mirror reflectivity, in order to correct imbalanced finesse due to manufacturing tolerances. Temperature variations in mirror substrate change the optical path length primarily through varying the index of refraction and are tuned to correct for a finesse imbalance of up to 2.8% by a full etalon fringe of 0.257 K. A negative feedback control system was designed to control the mirror temperature by using an electrical resistive heating belt actuator for a heat transfer process modeled as a two-pole plant. A zero controller filter was designed which achieves temperature control within 2.3% of the etalon fringe and recovers to within 10% of the working point within 32 hours after a step input of one etalon fringe. A preliminary unlock condition control designed to compensate when the interferometer unlocks shows that the control remains stable even after a drastic change in the plant due to the absence of the laser heating. Further improvements to the control must also consider the full heat transfer mechanisms by using modern control state space models.

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