Hannover 2020 – wissenschaftliches Programm
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MS 13.4: Vortrag
Donnerstag, 12. März 2020, 16:00–16:15, f128
A diode pumped single frequency continuous wave Titanium:sapphire laser — •Volker Sonnenschein1, Kato Kotaro1, Hattori Koya1, Hideki Tomita1, Dominik Studer2, Ryohei Terabayashi1, Felix Weber2, and Klaus Wendt2 — 1Nagoya University, Japan — 2Mainz University, Germany
Pumping of Ti:sapphire using InGaN diode lasers promises a drastic reduction in cost and system size compared to traditionally employed frequency doubled Nd:YAG pump lasers. Several research groups have demonstrated diode-pumped femtosecond Ti:sapphire systems. Here we show a proof of principle for a single-frequency continuous wave (cw) Ti:sapphire system for use in high resolution spectroscopy.
The laser is pumped by three diodes providing a combined pump power of up to 8 W. A wide tuning range from 725-890 nm was realized. Frequency control and stabilization uses piezo actuators and an external reference cavity fixed on a low thermal expansion Zerodur spacer. A short-term spectral width of 500 kHz was observed using beat-note measurements with respect to a reference laser. A measurement of the hyperfine structure in the D2 line of Rubidium yielded accurate parameters of the hyperfine coupling parameters and isotope shift, with deviations from the literature values well below 1 MHz. The full system promises a cw Ti:sapphire system at a significantly lower price point. Compared to widely utilized external cavity diode lasers a higher total output power and wider tuning range can be expected. Optimization of the pump-beam shaping and cavity geometry should further enhance these benefits.