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A compact multifunctional optical correlator system for pulse width measurement of ultrashort ultraviolet (UV) pulses has been designed and experimentally demonstrated. Both autocorrelation and cross-correlation functions are measured using a single nonlinear crystal, and the switching between two measurements requires no adjustment of phase matching and detector. The system can measure UV pulse widths from sub-picoseconds to 100 ps, and it involves no auxiliary pulse in the measurement. The measurement results on a burst-mode picosecond UV laser show a high-quality performance on speed, accuracy, resolution, and dynamic range. The proposed correlator can be applied to measure any ultrashort UV pulses produced through sum-frequency generation or second-harmonic generation.

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In this paper, an equivalent circuit model is developed for a commercial Gallium Nitride (GaN) gate injection transistor (GIT) device at room temperature. The I-V and C-V characteristics are extracted from the commercial device datasheet and fitted in MATLAB. The fitted equations are realized as a combination of behavioral circuit components to be carried out in SPICE simulation. The equivalent circuit model is tested in a simple configuration for I-V curve simulation through varying of parameters and then in a simple boost configuration typical for power electronics applications to check for convergence and expected results.

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