Influence of the Spot Size of the Probe Beam on the Detected THz Power Using Electro-Optic Detection Method

2011 ◽  
pp. 107-111
Author(s):  
Mukaddes Meliz Metbulut ◽  
Hasan Hüseyin Güllü ◽  
Hakan Altan
Keyword(s):  
Probe Beam ◽  
Detection Method ◽  
Spot Size ◽  
Electro Optic ◽  
Thz Power

scholarly journals Generation of monocycle efficient terahertz pulses by optical rectification in LiNBO3 at 800 nm

2018 ◽  
Vol 1 (1) ◽  
pp. 14
Author(s):  
Ali Khumaeni ◽  
Hideaki Kitahara, ◽  
Takashi Furuya ◽  
Kohji Yamamoto ◽  
Masahiko Tani
Keyword(s):  
Conversion Efficiency ◽  
Pump Pulse ◽  
Optical Rectification ◽  
Pulse Front ◽  
Optical Source ◽  
Znte Crystal ◽  
Terahertz Pulses ◽  
Electro Optic ◽  
Balanced Photodetector ◽  
Thz Power

Generation of efficient terahertz (THz) pulses was experimentally made by tilted pump pulse front scheme with a Mg-doped LiNbO3 crystal. In this study, a spitfire laser (Ti:sapphire laser, 800 nm, 3 mJ, 1 kHz) was used as an optical source for the generation and detection of THz pulses. The electro-optic (EO) detection optics consisting of a ZnTe crystal (1 mm in thickness) and a balanced photodetector was used. To obtain optimum THz characteristics and pump to THz power conversion efficiency, the image of the grating was made coincides with the tilted pump pulse front. The maximum THz electric field of 8.5 kV/cm and the frequency bandwidth of 2.5 THz were achieved by using pump pulse energy of 2.4 mJ and pump pulse width of 100 fs. The THz energy of 4.15 μJ was obtained and pump-to-THz conversion efficiency was estimated to be approximately 1.73 x 10-3.

An atomic spin precession detection method based on electro-optic modulation in an all-optical K–Rb hybrid atomic magnetometer

2017 ◽  
Vol 50 (26) ◽  
pp. 265001 ◽  
Author(s):  
Yanhui Hu ◽  
Xuejing Liu ◽  
Yang Li ◽  
Han Yao ◽  
Lingling Dai ◽  
...  
Keyword(s):  
Detection Method ◽  
Spin Precession ◽  
Atomic Spin ◽  
Electro Optic ◽  
All Optical

Optimizing the electro-optic detection of terahertz waves by ZnTe at 780 and 1560-nm probe-beam wavelengths

2018 ◽  
Vol 27 (04) ◽  
pp. 1850043 ◽  
Author(s):  
O. Hatem
Keyword(s):  
Probe Beam ◽  
Theoretical Calculations ◽  
Thz Radiation ◽  
Phase Matching ◽  
Terahertz Waves ◽  
Znte Crystal ◽  
Electro Optic ◽  
Thz Detection ◽  
Thz Detector ◽  
Coherence Lengths

Investigations were made for optimizing ZnTe as a THz detector at 1560-nm probe beam wavelength, and was compared with its performance at 780[Formula: see text]nm. High-sensitive THz detection was achieved when phase matching was maintained for long coherence lengths between the probe beam and the incident THz waves. A 1-mm thick ZnTe crystal enabled detection bandwidths of THz radiation up to 2 and 3 THz with probe wavelengths at 1560 and 780[Formula: see text]nm, respectively. Theoretical calculations showed coherence length of less than 50[Formula: see text][Formula: see text]m in ZnTe between the THz wave components above 4 THz and the optical waves at 780 and 1560[Formula: see text]nm.

scholarly journals A Blind Blur Detection Method for Electro-optic (EO) Images

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Greg Bower
Keyword(s):  
Real Time ◽  
Detection Method ◽  
Symbolic Analysis ◽  
Significant Issue ◽  
Blur Detection ◽  
Statistical Algorithm ◽  
Electro Optic

Blurring in Electro-Optic (EO) images is a significant issue that can arise due to the payload and platform operations.  It would be advantageous for unmanned platforms to determine if significant blurring is present within captured images before the images are observed and the collection sequence has ended.  In this way, the degradation can be identified and remedied in operation in real-time.  In this paper, we demonstrate that a statistical algorithm called Symbolic Analysis (SA) is suitable for detecting blurring in the output images of EO systems.  The SA algorithm adapted from previous work is described and demonstrated on an example image with artificial Gaussian-based blurring induced.

Optimization of Photothermal Refraction for Flowing Liquid Samples

1985 ◽  
Vol 39 (6) ◽  
pp. 1009-1013 ◽  
Author(s):  
Wayne A. Weimer ◽  
Norman J. Dovichi
Keyword(s):  
Probe Beam ◽  
Thermal Lens ◽  
Pump Beam ◽  
Spot Size ◽  
Probe Laser ◽  
Flowing Liquid ◽  
Beam Spot Size ◽  
Liquid Samples ◽  
Pump And Probe ◽  
Beam Center

A model has been developed for photothermal refraction using flowing liquid samples. In photothermal refraction, a cylindrical thermal lens is formed within the sample because of the temperature rise produced by the absorbance of a pump laser beam. This cylindrical thermal lens is intersected at right angles with a second probe laser. For static samples, the maximum signal results when the pump and probe beams are coplanar. Defocusing of the probe beam by the cylindrical thermal lens is detected as a change in the far-field probe beam center intensity. Flow acts to distort the temperature distribution by transporting heat down stream. For flowing samples, the optimum signal is found when the probe beam is located about one pump beam spot size down stream from the pump beam axis.

Remarks on the application of backscattered electron imaging (BEI) to the scanning electron microscopy (SEM) of biological structures

1983 ◽  
Vol 41 ◽  
pp. 484-487
Author(s):  
Etienne de Harven
Keyword(s):  
High Resolution ◽  
Incident Beam ◽  
Spot Size ◽  
Primary Electron ◽  
Critical Point Drying ◽  
Cell Shapes ◽  
High Resolution Images ◽  
Backscattered Electron ◽  
Electron Imaging ◽  
Scanning Electron

Biological ultrastructures have been extensively studied with the scanning electron microscope (SEM) for the past 12 years mainly because this instrument offers accurate and reproducible high resolution images of cell shapes, provided the cells are dried in ways which will spare them the damage which would be caused by air drying. This can be achieved by several techniques among which the critical point drying technique of T. Anderson has been, by far, the most reproducibly successful. Many biologists, however, have been interpreting SEM micrographs in terms of an exclusive secondary electron imaging (SEI) process in which the resolution is primarily limited by the spot size of the primary incident beam. in fact, this is not the case since it appears that high resolution, even on uncoated samples, is probably compromised by the emission of secondary electrons of much more complex origin.When an incident primary electron beam interacts with the surface of most biological samples, a large percentage of the electrons penetrate below the surface of the exposed cells.

Solid-phase immunoelectron microscopy for rapid diagnosis of enteroviruses

1984 ◽  
Vol 42 ◽  
pp. 226-227 ◽  
Author(s):  
K. Pegg-Feige ◽  
F. W. Doane
Keyword(s):  
Electron Microscopy ◽  
Cell Culture ◽  
Immunoelectron Microscopy ◽  
Detection Method ◽  
Solid Phase ◽  
Protein A ◽  
Plant Viruses ◽  
Rapid Diagnosis ◽  
Virus Diagnosis ◽  
Antiviral Antibody

Immunoelectron microscopy (IEM) applied to rapid virus diagnosis offers a more sensitive detection method than direct electron microscopy (DEM), and can also be used to serotype viruses. One of several IEM techniques is that introduced by Derrick in 1972, in which antiviral antibody is attached to the support film of an EM specimen grid. Originally developed for plant viruses, it has recently been applied to several animal viruses, especially rotaviruses. We have investigated the use of this solid phase IEM technique (SPIEM) in detecting and identifying enteroviruses (in the form of crude cell culture isolates), and have compared it with a modified “SPIEM-SPA” method in which grids are coated with protein A from Staphylococcus aureus prior to exposure to antiserum.

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