Abstract

Yb3+-doped CaF2 is in the focus of attention for developing high peak- and average power tunable femtosecond oscillators and amplifiers [1,2] because of a low quantum defect, high damage threshold, low linear and nonlinear refractive indices and suitability for direct pumping with laser diodes. Recently, a modified host, Yb3+, Na+:CaF2 was introduced, where Na+ is presumed to act as a charge compensator [3]. Cooled to cryogenic temperatures (the interest in cryogenically cooled amplifiers is determined by a number of advantages expected at low temperatures [4]), both Yb3+: and Yb3+, Na+:CaF2 crystals exhibit a significant increase of absorption cross-section in the vicinity of zero phonon line (ZPL), although ZPL preserves it's width, and disappearance of the ground state absorption beyond 1000 nm [5]. In this contribution, we present the latest developments of Yb fiber laser seeded, cw pumped, cryogenically cooled kHz-repetition-rate Yb3+, Na+:CaF2 regenerative amplifier (RA). Previously, several LN2-cooled Yb RAs at 10 Hz were developed by Yamakawa and coworkers [6].

© 2009 IEEE

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References

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