A new incoherent Kerr shutter is demonstrated. It utilizes nanosecond optical pulses from an optical parametric oscillator (OPO) that has a broad bandwidth. Through the use of a β-BaB2O4 crystal, the OPO has a coherence time of 60–800 fs and shows wide wavelength tunability from 410 to 2600 nm. Kerr relaxation time constants for CS2 and nitrobenzene are the same as those cited in previous works. We also show, for the first time to our knowledge, a 100-fs response for a nitrobenzene solution of 4-(N,N-diethylamino)-β-nitrostyrene at a 740-nm idler wavelength.
© 1996 Optical Society of America
Original Manuscript: August 1, 1995
Published: March 1, 1996
T. Yanagawa, K. Naganuma, H. Kanbara, and T. Kaino, "Optical parametric oscillator incoherent spectroscopy," Opt. Lett. 21, 318-320 (1996)