Journal
OPTICS EXPRESS
Volume 20, Issue 10, Pages 10562-10571Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.010562
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Funding
- Netherlands Organization for Scientific Research through the Dutch Foundation for Earth and Life Sciences [812.08.001, 819.02.001]
- Netherlands Foundation for Scientific Research - Chemical Sciences council
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Broadband femtosecond mid-infrared pulses can be converted into the visible spectral region by chirped pulse upconversion. We report here the upconversion of pump probe transient signals in the frequency region below 1800cm(-1), using the nonlinear optical crystal AgGaGeS4, realizing an important expansion of the application range of this method. Experiments were demonstrated with a slab of GaAs, in which the upconverted signals cover a window of 120cm(-1), with 1.5cm(-1) resolution. In experiments on the BLUF photoreceptor Slr1694, signals below 1 milliOD were well resolved after baseline correction. Possibilities for further optimization of the method are discussed. We conclude that this method is an attractive alternative for the traditional MCT arrays used in most mid-infrared pump probe experiments. (C)2012 Optical Society of America
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