scholarly journals Intensity Correlation Functions for 'Thermalised' TEMn0 Laser Beams

1986 ◽  
Vol 39 (4) ◽  
pp. 505
Author(s):  
R Hoare ◽  
R Mardling ◽  
GJ Troup
Keyword(s):  
Laser Beam ◽  
Correlation Functions ◽  
Single Mode ◽  
Laser Beams ◽  
Ground Glass ◽  
Intensity Correlation ◽  
Mode Laser ◽  
Single Mode Laser ◽  
Glass Disc ◽  
Useful Life

A well-stabilised, single mode laser beam will give zero intensity correlation. However, a laser beam may be 'thermalised' by shining it on a rotating ground glass disc, and then intensity correlation experiments will give nonzero results. We present here calculations of the intensity correlation functions of the TEMlO, TEM20, TEM30 and TEM40 Gaussian-Hermite beams. We were led to perform these calculations by the results of intensity correlation measurements on a laser with 'butted-on' mirrors nearing the end of its useful life.

OPTICAL POWER TRANSFER OF SINGLE-MODE LASER BEAMS THROUGH DISTORTING MEDIA USING A SEMILINEAR PHASE CONJUGATE MIRROR

1992 ◽  
Vol 01 (02) ◽  
pp. 421-430 ◽  
Author(s):  
ESA JAATINEN ◽  
BARRY LUTHER-DAVIES
Keyword(s):  
Optical Power ◽  
Single Mode ◽  
Input Power ◽  
Laser Beams ◽  
Power Transfer ◽  
Phase Conjugate ◽  
Mode Laser ◽  
Single Mode Laser ◽  
Power Transfer Efficiency ◽  
Phase Conjugate Mirror

We report experiments on the use of a semilinear phase-conjugate mirror to transfer single-mode laser beams through distorting media. Calculations using a 1-D model show that in optimum circumstances, up to 90% of the input power can be transferred to the system output whilst experimentally 23% power transfer has been observed limited by the absorption and gain in our Barium Titanate crystal. We have also studied seeding the semilinear mirror with a separate beam as a means of starting its oscillation in conditions where high power transfer efficiency is required and investigated regions of bistability in the output which also occur in this regime.

EFFECTS OF CORRELATION BETWEEN REAL AND IMAGINARY PARTS OF THE QUADRATIC PUMP NOISE ON THE INTENSITY FLUCTUATION OF A SINGLE-MODE LASER SYSTEM

2009 ◽  
Vol 23 (02) ◽  
pp. 155-161
Author(s):  
G. H. ZHAO ◽  
Y. L. XIANG ◽  
D. C. MEI
Keyword(s):  
Correlation Function ◽  
Relaxation Time ◽  
Intensity Fluctuation ◽  
Laser System ◽  
Single Mode ◽  
Intensity Correlation ◽  
Mode Laser ◽  
The Real ◽  
Single Mode Laser ◽  
Intensity Correlation Function

The effects of the correlations between real and imaginary parts of the quadratic pump noise on the normalized intensity correlation function and the associated relaxation time of a single-mode laser model were investigated. The expressions of the intensity correlation function C(s) and the relaxation time Tc were derived. Based on numerical computations, we found that Tc monotonously increases as the strength λp of correlation between the real and imaginary parts of quadratic pump noise increases and the larger λp value is, the slower C(s) decays. The presence of correlations between the real and imaginary parts of the quadratic pump noise causes the intensity fluctuation to increase.

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