Generation and coherent two-dimensional detection of continuous-wave terahertz radiation

2002 ◽  
Author(s):  
A. Nahata ◽  
J.T. Yardley ◽  
T.F. Heinz
Keyword(s):  
Terahertz Radiation ◽  
Continuous Wave ◽  
Two Dimensional

Two-dimensional imaging of continuous-wave terahertz radiation using electro-optic detection

2002 ◽  
Vol 81 (6) ◽  
pp. 963-965 ◽  
Author(s):  
Ajay Nahata ◽  
James T. Yardley ◽  
Tony F. Heinz
Keyword(s):  
Terahertz Radiation ◽  
Continuous Wave ◽  
Two Dimensional ◽  
Electro Optic

Multi-channel homodyne detection of continuous-wave terahertz radiation

2005 ◽  
Vol 87 (3) ◽  
pp. 034106 ◽  
Author(s):  
I. S. Gregory ◽  
W. R. Tribe ◽  
M. J. Evans ◽  
T. D. Drysdale ◽  
D. R. S. Cumming ◽  
...  
Keyword(s):  
Terahertz Radiation ◽  
Continuous Wave ◽  
Homodyne Detection

scholarly journals Recent Progress in Two-Dimensional Nanomaterials for Laser Protection

Chemistry ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 17-43 ◽  
Author(s):  
Zhiwei Liu ◽  
Bin Zhang ◽  
Yu Chen
Keyword(s):  
Laser Physics ◽  
Recent Progress ◽  
Continuous Wave ◽  
Two Dimensional ◽  
Relaxation Dynamics ◽  
Daily Lives ◽  
Carrier Relaxation ◽  
Optical Instruments ◽  
2D Nanomaterials ◽  
Human Eyes

The Nobel Prize in Physics 2018, “For groundbreaking inventions in the field of laser physics”, went to Arthur Ashkin and Gérard Mourou and Donna Strickland. Their inventions have revolutionized laser physics and greatly promoted the development of laser instruments, which have penetrated into many aspects of people’s daily lives. However, for the purpose of protecting human eyes or optical instruments from being damaged by both pulsed and continuous wave laser radiation, the research on laser protective materials is of particular significance. Due to the intriguing and outstanding physical, chemical, and structural properties, two-dimensional (2D) nanomaterials have been extensively studied as optical limiting (OL) materials owing to their broadband nonlinear optical (NLO) response and fast carrier relaxation dynamics that are important for reducing the laser intensity. This review systematically describes the OL mechanisms and the recent progress in 2D nanomaterials for laser protection.

Field Computation for Two-Dimensional Array Transducers with Limited Diffraction Array Beams

2005 ◽  
Vol 27 (4) ◽  
pp. 237-255 ◽  
Author(s):  
Jian-Yu Lu ◽  
Jiqi Cheng
Keyword(s):  
Continuous Wave ◽  
Weighting Function ◽  
Near Field ◽  
Bessel Beam ◽  
Two Dimensional ◽  
Axially Symmetric ◽  
Computationally Efficient ◽  
Annular Array ◽  
Array Transducer ◽  
Analytical Expressions

A method is developed for calculating fields produced with a two-dimensional (2D) array transducer. This method decomposes an arbitrary 2D aperture weighting function into a set of limited diffraction array beams. Using the analytical expressions of limited diffraction beams, arbitrary continuous wave (cw) or pulse wave (pw) fields of 2D arrays can be obtained with a simple superposition of these beams. In addition, this method can be simplified and applied to a 1D array transducer of a finite or infinite elevation height. For beams produced with axially symmetric aperture weighting functions, this method can be reduced to the Fourier-Bessel method studied previously where an annular array transducer can be used. The advantage of the method is that it is accurate and computationally efficient, especially in regions that are not far from the surface of the transducer (near field), where it is important for medical imaging. Both computer simulations and a synthetic array experiment are carried out to verify the method. Results (Bessel beam, focused Gaussian beam, X wave and asymmetric array beams) show that the method is accurate as compared to that using the Rayleigh-Sommerfeld diffraction formula and agrees well with the experiment.

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