Infrared absorption in KTP isomorphs induced with blue picosecond pulses

Picosecond blue-light induced infrared absorption (BLIIRA) was investigated in periodically poled KTiOPO sub(4), Rb:KTiOPO sub(4), RbTiOPO sub(4), KTiOAsO sub(4) and RbTiOAsO sub(4). The dependence of BLIIRA on blue light average power and intensity as well as on crystal temperature was studied. The...

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Bibliographic Details
Published in:Optical materials express 2015-12, Vol.5 (12), p.2951-2963
Main Authors: Tjörnhammar, Staffan, Maestroni, Valerio, Zukauskas, Andrius, Uždavinys, Tomas Kristijonas, Canalias, Carlota, Laurell, Fredrik, Pasiskevicius, Valdas
Format: Article
Language:English
Subjects:
Arsenates
Color centers
Crystals
Infrared absorption
Luminous intensity
Picosecond pulses
Stabilization
Vibration
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Summary:Picosecond blue-light induced infrared absorption (BLIIRA) was investigated in periodically poled KTiOPO sub(4), Rb:KTiOPO sub(4), RbTiOPO sub(4), KTiOAsO sub(4) and RbTiOAsO sub(4). The dependence of BLIIRA on blue light average power and intensity as well as on crystal temperature was studied. The results show the presence of at least two different types of color centers. A higher level of remnant absorption was observed in the phosphates compared to the arsenates. We attribute the largest portion of the induced absorption to photo-generated electrons and holes self-trapped in the proximity to Ti super(4+) and O super(2-) ions, respectively, forming polaron color centers. Stabilization of these centers is aided by the presence of mobile alkali metal vacancies in the crystal. The lower level of remnant absorption in arsenates is related to higher population of thermal phonons related to TiO sub(6) group vibrations in arsenates.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.5.002951