研究目的
Investigating the feasibility of a direct diode pumped continuous-wave Ti:sapphire laser for high-resolution spectroscopy.
研究成果
A tunable continuous wave Ti:sapphire laser pumped by up to three InGaN diodes was demonstrated. Characterization of the frequency noise via beat-note measurements confirms a narrow linewidth below 1 MHz, suggesting that noise contributions due to multimode diode pumping is limited. With a sufficiently precise wavelength calibration technique the Rb saturated absorption measurement yielded precise results close to the known literature values.
研究不足
The complexity of the system is higher compared to often used ECDL systems. The still somewhat limited tuning range of the laser makes a scan across the full structure difficult.
1：Experimental Design and Method Selection:
A bow-tie geometry with optical diode is chosen for unidirectional single-mode operation. Frequency selection is performed with a standard combination of birefringent filter and etalon.
2：Sample Selection and Data Sources:
The D2 line of Rubidium is used for saturated absorption spectroscopy.
3：List of Experimental Equipment and Materials:
Ti:sapphire laser, birefringent filter, etalon, piezo-driven etalon, optical cavity, photodiode detectors, Rubidium sample.
4：Experimental Procedures and Operational Workflow:
The piezo-driven etalon is stabilized to one of the cavity modes via dither-locking method. The cavity-mode is additionally locked to an external optical cavity with low frequency drift.
5：Data Analysis Methods:
The frequency stability and noise of the laser are investigated via beat-note measurements using a frequency doubled femto-second fiber laser as reference.
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