Abstract

In last years CPA technique is widely used for amplification of short pulses. However chirped pulse has some additional interesting properties which can make it perspective for another applications. For example in paper[1] was demonstrated long range, high resolution laser radar using chirped pulse to avoid nonlinear effects in air. This scheme with compression of the pulses in final stage in our opinion is unreliable and expensive because it demands autocorrelator or streak-camera for measurements. We propose the simple and reliable scheme based on chirped pulse interferometry with no compression. Theoretical analysis shows that two chirped pulses interference leads to spectrum modulation of the output pulse according to sin-like law. Depth of modulation depends on the ratio of the input amplitudes and period is in inverse proportion to time delay between two pulses. Accuracy of this method improved with number of measured spectrum periods. To measure spectrum modulation it can be used spectrometer consisting of diffraction grating, lens and CCD-camera.

© 1996 IEEE