USE OF A CO2LASER AS A LOCAL OSCILLATOR FOR A 10 MICRON HETERODYNE DETECTION

1987 ◽  
Vol 48 (C7) ◽  
pp. C7-569-C7-571
Author(s):  
A. DELAHAIGUE ◽  
D. COURTOIS ◽  
C. THIEBEAUX ◽  
H. LE CORRE
Keyword(s):  
Local Oscillator ◽  
Heterodyne Detection

scholarly journals Photon Correlation Spectroscopy Using Optical Heterodyne Detection

1981 ◽  
Vol 34 (5) ◽  
pp. 575 ◽  
Author(s):  
Guy C Fletcher ◽  
Julienne I Harnett
Keyword(s):  
Scattered Light ◽  
Local Oscillator ◽  
Correlation Spectroscopy ◽  
Polystyrene Latex ◽  
Heterodyne Detection ◽  
Experimental Comparison ◽  
Statistical Accuracy ◽  
Theoretical Predictions ◽  
Heterodyne Technique ◽  
Optical Heterodyne Detection

The detection by optical heterodyning of laser light scattered from solutions of macromolecules offers significant improvement in statistical accuracy over the more usual self-beating method. Nevertheless the heterodyne technique is not commonly used because of the supposed ifficulties associated with stable and efficient mixing of the scattered light with a local oscillator beam. We have carried out an experimental comparison of several methods of mixing the two beams, using very dilute solutions of polystyrene latex spheres as scatterers. Experimental data are also presented for the apparent particle radius as a function of the local oscillator level, and are compared with theoretical predictions.

A High-Power G-band Schottky Local Oscillator Chain for Submillimeter Wave Heterodyne Detection

2015 ◽  
Vol 36 (5) ◽  
pp. 430-444 ◽  
Author(s):  
Zhenhua Chen ◽  
Xiang Chen ◽  
Wanzhao Cui ◽  
Xiaojun Li ◽  
Junxiang Ge
Keyword(s):  
High Power ◽  
Local Oscillator ◽  
Submillimeter Wave ◽  
Heterodyne Detection

Local-oscillator excess-noise suppression for homodyne and heterodyne detection

1983 ◽  
Vol 8 (8) ◽  
pp. 419 ◽  
Author(s):  
G. L. Abbas ◽  
V. W. S. Chan ◽  
T. K. Yee
Keyword(s):  
Noise Suppression ◽  
Local Oscillator ◽  
Excess Noise ◽  
Heterodyne Detection

scholarly journals Far-field linear optical superresolution via heterodyne detection in a higher-order local oscillator mode

Optica ◽  
2016 ◽  
Vol 3 (10) ◽  
pp. 1148 ◽  
Author(s):  
Fan Yang ◽  
Arina Tashchilina ◽  
E. S. Moiseev ◽  
Christoph Simon ◽  
A. I. Lvovsky
Keyword(s):  
Local Oscillator ◽  
Higher Order ◽  
Heterodyne Detection ◽  
Far Field ◽  
Linear Optical

Télémètre à détection coherente avec un laser CO2 à ondes entretenues : étude et conception

1983 ◽  
Vol 61 (2) ◽  
pp. 318-331 ◽  
Author(s):  
Denis Vincent ◽  
Gabriel Otis
Keyword(s):  
Detection System ◽  
Signal To Noise Ratio ◽  
Optical Power ◽  
Experimental System ◽  
Intermediate Frequency ◽  
Local Oscillator ◽  
Heterodyne Detection ◽  
Signal To Noise ◽  
Noise Ratio ◽  
Rotating Target

We performed a theoretical and experimental study of a 10.6 μm heterodyne detection system with nonlinear postdetection. A single laser serves as both transmitter and local oscillator; the intermediate frequency is given by the Doppler effect due to a rotating target. An electrooptic crystal modulates the amplitude of the laser beam at a frequency of 15 kHz; a synchronous voltmeter measures the return signal after the nonlinear element. Values of the signal-to-noise ratio with respect to incident optical power agree with the results of the theoretical model. In particular, experimentally measured target-induced frequency spreading effects on the signal-to-noise ratio correspond to the predictions of the model. We also describe an experimental system.

Limitation on the local oscillator power in heterodyne detection

1993 ◽  
Vol 23 (4) ◽  
pp. 355-358
Author(s):  
Abdulghafoor Abdullah ◽  
Zdziaslaw Blaszczak ◽  
A Drobnik ◽  
G Owczarek ◽  
Leszek Wolf
Keyword(s):  
Local Oscillator ◽  
Heterodyne Detection

scholarly journals Development of a correlation ECE radiometer for electron temperature fluctuation measurements in Heliotron J

2019 ◽  
Vol 203 ◽  
pp. 03013
Author(s):  
Gavin M. Weir ◽  
Kazunobu Nagasaki ◽  
Jinxiang Zhu ◽  
Maoyuan Luo ◽  
Hiroyuki Okada ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuation ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Intermediate Frequency ◽  
Local Oscillator ◽  
Heterodyne Detection ◽  
Helical Axis ◽  
Detection Systems ◽  
Heating Radiation

A radial correlation ECE radiometer diagnostic has been developed for electron temperature fluctuation measurements in the helical-axis heliotron device, Heliotron J. The radiometer consists of two heterodyne detection systems. One system scans the frequency of a local oscillator from 52 to 64 GHz with a single intermediate frequency filter, and the second system has a fixed frequency, 56 GHz local oscillator with four intermediate frequency filters. This frequency range covers measurement positions spanning from the plasma core to the half radius. Laboratory tests indicate that each system has narrow intermediate frequency bandwidth and high-sensitivity over a large dynamic range. During plasma experiments with NBI heating, radiation temperature fluctuation measured by the CECE radiometer decrease with increasing ECCD commensurate with previous measurements of energetic particle driven modes on Heliotron J.

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