NDLI: Spectroscopy and lasing of cryogenically cooled Yb, Na:CaF2

Content Provider	Springer Nature Link
Author	Marcinkevičius, A. Li, R. Fermann, M. E. Lai, W. J. Phua, P. B. Danielius, R. Ališauskas, S. Sidorov, D. Giniūnas, L. Irshad, A. Xu, J. Li, H. Pugžlys, A. Andriukaitis, G. Baltuška, A. Su, L.
Copyright Year	2009
Abstract	Absorption, photoluminescence and cw-lasing properties of a novel Na+-codoped Yb3+:CaF2 laser crystal are investigated in the temperature range from 10 K to 290 K. Cryogenic cooling leads to the disappearance of the ground-state absorption in the spectral region above 1000 nm and a substantial increase of emission and absorption cross-sections. A particular advantage of the Yb3+, Na+-codoped CaF2 crystal lies in the possibility of a direct pumping in the vicinity of the zero phonon line while nearly perfectly avoiding an overlap with the stimulated emission. Further advantages of the low-temperature operation are demonstrated by achieving a close to the theoretical limit slope efficiency of 92% in a cw-laser operation with an output coupler of 28%. By seeding stretched pulses from a femtosecond Yb fiber oscillator into a cryogenically cooled DPSS Yb3+, Na+:CaF2 regenerative amplifier, we obtain >3-mJ pulses at a 1-kHz repetition rate with a spectral bandwidth exceeding 12 nm. The pulses are compressed with a single grating compressor to 173 fs as verified by SHG FROG. Shaping of the spectral amplitude of the seed and active control of the higher-order phase is shown to be crucial for obtaining sub-200-fs pulses at multi-mJ energies.
Ending Page	350
Page Count	12
Starting Page	339
File Format	PDF
ISSN	09462171
e-ISSN	14320649
Journal	Applied Physics B
Issue Number	2
Volume Number	97
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-09-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Quantum Optics Optics, Optoelectronics, Plasmonics and Optical Devices Physical Chemistry Laser Technology, Photonics Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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