Picosecond all-optical switching in a Fabry–Perot cavity containing polydiacetylene

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Abstract
Off‐resonant nonlinear optical measurements have been made in a Fabry–Perot cavity containing a polydiacetylene (PTS) single crystal. The cavity length was controlled to select specific bias points on the Fabry‐Perot fringe and the measurements were made by a pump‐probe technique using 90 ps pulses at 1.06 μm wavelength. The changes in transmission at selected bias points were measured as a function of time delay between the pump and the probe. The measured response time was found to be pulse‐width limited and the maximum changes in transmission were as large as 50% at low optical intensities (∼10 MW/cm2). The sign of n 2 was determined from the direction of the fringe shift and was found to be negative. All‐optical switching (82 MHz) at a picosecond time scale is demonstrated for an organic material.

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