Birefringence of Β-BaB2O4 crystal in the terahertz region for parametric device design

Elmer Estacio, Shigeki Saito, Tomoharu Nakazato, Yusuke Furukawa, Nobuhiko Sarukura, Marilou Cadatal, Minh Hong Pham, Carlito Ponseca, Hiroshi Mizuseki, Yoshiyuki Kawazoe

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22 Citations (Scopus)


Β-Ba B2 O4 (BBO) was found to have huge birefringence in the 0.1-1.1 THz frequency region. Polarized terahertz transmission spectroscopy revealed a Δnn value of about 0.12±0.02. This result could be related to a polarization-dependent absorption that was observed at about 0.65 THz; in close agreement with first principles-calculations, showing this to be due to low-frequency phonon modes of the [B3 O6] 3 -rings. These findings suggest the utilization of the birefringent properties of BBO for optical parametric devices including amplifiers and oscillators, operating in the terahertz regime.

Original languageEnglish
Article number091116
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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