Intensity autocorrelation measurement of 400 nm picosecond optical pulses from a GaInN mode-locked semiconductor laser diode using surface second harmonic generation of β-BaB2O4 crystal

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  • Intensity autocorrelation measurement of 400 nm picosecond optical pulses from a GaInN mode locked semiconductor laser diode using surface second harmonic generation of v BaB2O4 crystal

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We developed an intensity autocorrelation measurement technique using the surface second harmonic generation (SHG) of a β-BaB2O4 crystal to characterize picosecond optical pulses at 402 nm from a GaInN mode-locked semiconductor laser diode (MLLD). This technique enabled us to precisely evaluate the pulse width at 402 nm, and the shortest pulse width of 1.6 ps was achieved from the GaInN MLLD operating under a reverse bias voltage of -25 V applied to a saturable absorber.

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