Apparatus for autocorrelating optical radiation signals

Details Apparatus for autocorrelating optical radiation signals Apparatus for autocorrelating optical radiation signals

1989-04-10

1991-07-23

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

G01B 902

Patent

active

050338536

ABSTRACT:
An apparatus (12) generates information about the width of pulses in an optical train using an autocorrelation technique. In the apparatus, the incoming beam (10) is split into two paths (10a, 10b). The path length of one of the beams (10b) is varied using a reciprocating stage (40) having a reflector (50) mounted thereon. The stage is driven by a cam (42) rotating at a constant speed. A portion (42b) of the curvature of the cam is arranged such that the distance between the rotational axis (44) of the cam and the stage varies proportionally with the rotational angle of the cam such that the path length of the beam will change at a constant rate. The two beams are then recombined in a second harmonic generation crystal (28) which generates an output signal. The output signal is monitored by a photodetector (30) and may be displayed on an oscilloscope to provide a measurement of the pulse width of the input pulses.

REFERENCES:
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Ishida et al., "Rapid-Scan Autocorrelator for Monitoring cw Mode-Locked Dye Laser Pulses", Jap. J. Of Appl. Phy., vol. 19, No. 6, pp. L289-L292, 6/1980.
Harde et al., "Rapid Scanning Autocorrelator for Measurements of Picosecond Laser Pulses", Opt. Commun., vol. 38, No. 3, pp. 211-216, 8/1981.
"Real-Time Intensity Autocorrelation Interferometer", R. L. Fork and F. A. Beisser, Applied Optics, vol. 17, No. 22, Nov. 15, 1978.

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