All-optical long-distance guide for cold molecules using a parallel hollow beam generated by a nonlinear ZnSe crystal

2019 ◽  
Vol 430 ◽  
pp. 318-322 ◽  
Author(s):  
Yong Xia ◽  
Xingjia Li ◽  
Bin Wei ◽  
Haiyu Yu ◽  
Zhihao Zhou ◽  
...  
Keyword(s):  
Znse Crystal ◽  
Long Distance ◽  
Hollow Beam ◽  
Cold Molecules ◽  
All Optical

scholarly journals Trace CH4 Gas Detection Based on an Integrated Spherical Photoacoustic Cell

2021 ◽  
Vol 11 (11) ◽  
pp. 4997
Author(s):  
Yexiang Jiao ◽  
Hongji Fan ◽  
Zhenfeng Gong ◽  
Kai Yang ◽  
Feiyang Shen ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
High Speed ◽  
Gas Detection ◽  
Laser Source ◽  
Photoacoustic Cell ◽  
Long Distance ◽  
Element Simulation ◽  
Resonant Modes ◽  
All Optical ◽  
Dfb Laser

This paper presents an integrated spherical photoacoustic cell (SPAC) for trace methane (CH4) gas detection. Theoretical analysis and analogue simulations are carried out to analyze the acoustic field distribution of the SPAC at resonant and non-resonant modes. The finite element simulation results based on COMSOL show that the first-order radial resonant frequency and second-order angular resonant frequency are 24,540 Hz and 18,250 Hz, respectively, which show good agreements with the formula analysis results. The integrated SPAC, together with a high-speed spectrometer and a distributed feedback (DFB) laser source, makes up a photoacoustic (PA) spectroscopy (PAS) system, which is employed for CH4 detection. The minimum detection limit (MDL) is measured to be 126.9 parts per billion (ppb) at an average time of 1000 s. The proposed SPAC has an integrated, miniaturized and all-optical structure, which can be used for remote and long-distance trace gas detection.

Generation of a dark hollow beam by a nonlinear ZnSe crystal and its propagation properties in free space: Theoretical analysis

2014 ◽  
Vol 322 ◽  
pp. 179-182 ◽  
Author(s):  
Xiangli Du ◽  
Yaling Yin ◽  
Gongjue Zheng ◽  
Chaoxiu Guo ◽  
Yu Sun ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Free Space ◽  
Znse Crystal ◽  
Hollow Beam ◽  
Propagation Properties

An all-optical long-distance multi-Gbytes/s bit-parallel WDM single-fiber link

1998 ◽  
Vol 16 (9) ◽  
pp. 1577-1582 ◽  
Author(s):  
L. Bergman ◽  
J. Morookian ◽  
C. Yeh
Keyword(s):  
Single Fiber ◽  
Long Distance ◽  
All Optical ◽  
Fiber Link

scholarly journals Design and Simulation of Linear All-Optical Comparator Based on Square-Lattice Photonic Crystals

2021 ◽  
Author(s):  
Fariborz Parandin ◽  
Reza Kamarian ◽  
Mohamadreza Jomour
Keyword(s):  
Photonic Crystals ◽  
Integrated Circuits ◽  
Photonic Integrated Circuits ◽  
Optical Power ◽  
Logic Circuits ◽  
Logic Circuit ◽  
Square Lattice ◽  
Refractive Indices ◽  
Long Distance ◽  
All Optical

Abstract An optical comparator is an important logic circuit used in digital designs. Photonic crystals are among the platforms for implementing different kinds of gates and logic circuits. Photonic crystals are structures with alternating refractive indices. In digital optics, logical values “0” and “1” are defined based on the level of optical power. In this paper, an optical comparator based on square-lattice photonic crystals is designed and simulated. In the design of this comparator, a small-sized structure is used. The simulation results show that in the proposed comparator, there is a long distance between logical values ​​“0” and “1”. Due to the small size of this comparator and the adequate distance between logical values ​​“0” and “1”, this structure suits photonic integrated circuits with high accuracy.

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