15 February 2018 GHz Yb:KYW oscillators in time-resolved spectroscopy
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A high-speed asynchronous optical sampling system (ASOPS) based on Yb:KYW oscillators with 1-GHz repetition rate is reported. Two frequency-offset-stabilized diode-pumped Yb:KYW oscillators are employed as pump and probe source, respectively. The temporal resolution of this system within 1-ns time window is limited to 500 fs and the noise floor around 10-6 (ΔR/R) close to the shot-noise level is obtained within an acquisition time of a few seconds. Coherent acoustic phonons are investigated by measuring multilayer semiconductor structures with multiple quantum wells and aluminum/silicon membranes in this ASOPS system. A wavepacket-like phonon sequence at 360 GHz range is detected in the semiconductor structures and a decaying sequence of acoustic oscillations up to 200 GHz is obtained in the aluminum/silicon membranes. Coherent acoustic phonons generated from semiconductor structures are further manipulated by a double pump scheme through pump time delay control.
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Changxiu Li, Changxiu Li, Nico Krauß, Nico Krauß, Gerhard Schäfer, Gerhard Schäfer, Lukas Ebner, Lukas Ebner, Oliver Kliebisch, Oliver Kliebisch, Johannes Schmidt, Johannes Schmidt, Stephan Winnerl, Stephan Winnerl, Mike Hettich, Mike Hettich, Thomas Dekorsy, Thomas Dekorsy, } "GHz Yb:KYW oscillators in time-resolved spectroscopy", Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105112I (15 February 2018); doi: 10.1117/12.2297568; https://doi.org/10.1117/12.2297568

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