Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1981-07-31
1983-09-27
Punter, William H.
Optics: measuring and testing
By particle light scattering
With photocell detection
356121, G01B 902
Patent
active
044065426
ABSTRACT:
Autocorrelation traces of laser pulses of short duration are produced by a method and apparatus that uses a rotating glass block to vary the path length on a time scale rapid enough to display the traces on a synchronized oscilloscope. Both paths of a split input beam of a laser pulse pass through the glass block. Rotation of the glass block changes the relative time of travel for light pulses along the two paths. The paths of the two beam arms pass through the block from different directions at a relative angle chosen so that the relative travel time difference is nearly linearly related to the angular position of the block during its rotation.
Autocorrelation with rapid scanning through rotation of the block enables measurement of repetitive laser light pulses of very short duration, down to the order of one picosecond. An oscilloscope display of the autocorrelation traces allows the user to make laser adjustments while continuously monitoring the pulse correlation function so that the laser can be tuned in real time to produce ultra-short pulses.
REFERENCES:
patent: 3170982 (1965-02-01), Hemstreet et al.
patent: 3520616 (1970-07-01), Glenn et al.
patent: 3675985 (1972-07-01), Gloge
patent: 4190366 (1980-02-01), Doyle
Ishida et al., "Rapid-Scan Autocorrelator for Monitoring CW Mode-Locked Dye Laser Pulses", Japanese Jr. of App. Physics, 6-1980, pp. L289-L292.
Crane et al., "A Dispersive Phase Shifter for Use in Nonlinear Optical Interference Experiments", J. App. Phys. 1-1979, pp. 47-48.
Fork et al., "Real-Time Intensity Autocorrelation Interferometer", App. Optics, 11-1978, pp. 3534-3535.
Boggy Richard D.
Eggleston John M.
Johnson Richard H.
Schulthess Carl W.
Feix Donald C.
Punter William H.
Spectra-Physics Inc.
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