Abstract

A real time interferometric autocorrelator was fabricated for characterizing the pulse width and the phase distribution of ultrashort laser pulses. A data acquisition system based on the direct memory access (DMA) was devised in order to monitor the real time autocorelation trace. The system is capable of measuring not only the intensity distribution but also the phase distribution of optical pulses. The output pulses of a femtosecond Ti:sapphire laser were analyzed utilizing the system. Applications were made to demonstrate the characterization of the nonlinear optical processes in KDP and (beta) - BBO crystals. In a (beta) -BBO crystal, the phase mismatch effect was successfully identified and measured in the second harmonic generation (SHG) processes.

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