High-repetition-rate white-light pump-probe spectroscopy with a tapered fiber |
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Authors: | Punke M Hoos F Karnutsch C Lemmer U Linder N Streubel K |
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Affiliation: | Light Technology Institute and Center for Functional Nanostructures (CFN), Universit?t Karlsruhe (TH), Kaiserstrasse 12, D-76131 Karlsruhe, Germany. martin.punke@lti.uni-karlsruhe.de |
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Abstract: | We have realized a 76 MHz white-light differential transmission spectroscopy system. The technique employs a Ti:sapphire laser oscillator and a tapered fiber 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. |
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