We report on polarized spectroscopic properties of Ho3+ ions in orthorhombic (sp. gr. Pnma) yttrium orthoaluminate YAlO3 crystals for laser development at 2 μm and 3 μm. This includes polarized Raman, absorption and luminescence spectra, fluorescence lifetime measurements and Stark energy-level study. The transition intensities for Ho3+ ions are calculated using the Judd-Ofelt theory. The peak stimulated-emission cross-sections are 2.01×10-20 cm2 at 1977 nm (5 I7 → 5 I8) and 2.31×10-20 cm2 at 2918 nm (5 I6 → 5 I7) for light polarization E || b. For both transitions, pump-induced polarization-switching is expected. The fluorescence lifetimes of the 5 I7 and 5 I6 Ho3+ manifolds are 7.27 and 0.36 ms, respectively (for 1 at.% Ho3+ -doping).
We demonstrate a diode-pumped SESAM mode-locked Yb:(Y,Gd)AlO3 laser delivering soliton pulses as short as 28-fs at 1063 nm with an average output power of 21 mW. The maximum average output power is scaled to 135 mW for a pulse duration of 37 fs.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.