Evaluation of thermo-optic characteristics of cryogenically cooled Yb:YAG ceramics | Zendy

Ryo Yasuhara | Zendy; Hiroaki Furuse | Zendy; A. Iwamoto | Zendy; Junji Kawanaka | Zendy; Takagimi Yanagitani | Zendy

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Evaluation of thermo-optic characteristics of cryogenically cooled Yb:YAG ceramics

Author(s) -

Ryo Yasuhara,

Hiroaki Furuse,

A. Iwamoto,

Junji Kawanaka,

Takagimi Yanagitani

Publication year - 2012

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.20.029531

Subject(s) - materials science , thermal expansion , refractive index , ceramic , optics , thermal conductivity , laser , optoelectronics , composite material , physics

The temperature dependence of the thermo-optic effect in cryogenically cooled Yb:YAG ceramics was evaluated by measuring the thermo-optic coefficient (the derivative of refractive index with respect to temperature, i.e., dn/dT), thermal expansion coefficient (α), and thermal conductivity (κ) between 70 and 300 K. These parameters significantly improved at low temperature. Observed values indicated that a laser gain medium cooled to 70 K can sustain a thermal load up to 20 times higher than that at 300 K, for comparable thermo-optic effects. To our best knowledge, this is the first quantitative evaluation of the improvement in thermo-optic characteristics of cryogenically cooled Yb:YAG ceramics.

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