Abstract
Trivalent praseodymium ions doped fluoride crystal has a large number of optical transitions over the entire visible range. Pr :YLF is one of promising laser media, which can be directly pumped by blue InGaN laser diodes [1]. On the other hand, less experimentl achievements have been reported on mode-lock operation for Pr lasers. In 1995, Ruan et al. reported Kerr-lens mode-locking of a Pr :YLF laser at 640 nm by employing an Arion gas laser. An average power of 30 mW was obtained with a pulse width of 8.5 ps [2]. In 1996, Sutherland et al. demonstrated a mode-locked Pr :YLF laser at 613 nm with a pulse width of 400 fs [3]. Very recently, the first all-solid-state mode-lock Pr :YLF laser was achieved by Gaponenko et al. at 640 nm using a GalnP SESAM and a 480-nm 2ω-OPSL pump source [4]. The output power of 16 mW was obtained with a pulse width of 18 ps and a repitition rate of 85.5 MHz.
© 2015 IEEE
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