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High-repetition-rate white-light pump–probe spectroscopy with a tapered fiber
M. Punke, F. Hoos, C. Karnutsch, U. Lemmer, N. Linder, K. Streubel (pdf)
Optics Letters 31 (8), p. 1157-1159 (2006)
We have realized a 76 MHz white-light differential transmission spectroscopy system. The technique employs a Ti:sapphire laser oscillator TIF-50, Del Mar Ventures, San Diego (current model name Trestles 50) and a tapered fiber (NT&C, Marnheim, Germany) to generate a white-light continuum spanning almost the full visible to near-infrared spectral range. Using acousto-optical modulation and subsequent lock-in detection, transient relative transmission changes as small as 10−5 are detected. The method is applied to study the ultrafast gain dynamics of the active layer of a vertical-external-cavity surface-emitting laser based on a multiple-quantum-well structure.
Fig.1 Schematic diagram of the experimental setup.
AOM, acousto-optic modulator; DC, dichroic mirror; DL, delay line; IF, variable interference filter; SHG, second harmonic generation.
Fig 2. Tapered fiber output spectra.
(Photograph of the beam after diffraction on a grating.)
Fig. 3 Differential transmission measurements of the investigated AlGaInP MQW structure.
Pump wavelength, 400 nm; pump pulse energy, 150 pJ.
Universität Karlsruhe (TH)
Light Technology Institute
Martin Punke received the M.Sc in electrical engineering and information technology from the University of Karlsruhe in 2003. In his master thesis he worked on the realization of a femtosecond pump-probe setup utilizing a tapered fiber for white-light generation. Since 2003, he has been working towards his PhD degree at the Light Technology Institute of the University of Karlsruhe. He is currently working on the combination of organic semiconductor devices like OLEDs, organic photodiodes and lasers with micro-optics for applications like biological sensor systems and optical interconnects.
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