COMPARISON METHOD FOR LASER PULSE, SCANNING METHOD FOR HIGH SPEED LASER, HIGH SPEED SCANNING LASER DEVICE, SHORT PULSE LASER DEVICE, DISTANCE MEASURING DEVICE, ELECTRIC OPTICAL SAMPLING/OSCILLOSCOPE, SHORT PULSE LASER STABLE CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method and a device for time scanning using super short pulse width laser generating by minimum (micron) mechanical operation and provide a method for calibrating with high accuracy timing of the order of femtosecond. SOLUTION: The cavity length of one 620 of two lasers 610 and 620 is given a swing with a piezoelement PZT. Fabry-Perot etalon FP produces a timing pulse line from a single pulse of laser 610. A correlator 640 correlates the timing pulse line and the gate pulse from the laser 620 and produces a calibration time scale, which can be applied much in the field requiring a high grade high speed scanning and time calibration. For example, it can be applied for surface measurement, charge dynamics measurement of semiconductor, electric optical test of ultrahigh speed electron/photoelectric device, reflectivity measurement in optical time region, electric-optical sampling/oscilloscope, etc.