We report on the performance of a setup designed for femtosecond pump-probe spectroscopy in the near infrared (NIR) spectral region. We generate a supercontinuum (SC) probe by coupling 140 fs light pulses at 1550 nm into a ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) fiber. The combined high nonlinearity and transparency of the ZBLAN fluoride glass allows us to obtain a SC probe from 1 to 2.6 μm.
The NIR pulses are used to demonstrate a proof of principle experiment probing the relaxation of photo induced excitations in a conjugated polymer:fullerene blend film. The results show the possibility to perform fibre based NIR SC femtosecond spectroscopy at >100 KHz repetition rate and using lasers with pulse energy just above 300 nJ.
Heidt, A.M., Price, J.H.V., Baskiotis, C., Feehan, J.S., Li, Z., Alam, S.U. and Richardson, D.J., 2013. Mid-infrared ZBLAN fiber supercontinuum source using picosecond diode-pumping at 2 µm. Optics express, 21(20), pp.24281-24287.
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Categories: Photonics & Optoelectronics