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dc.contributor.authorTu, C.-S.
dc.contributor.authorYeh, Y.-L.
dc.contributor.authorKatiyar, R. S.
dc.contributor.authorGuo, Ruqian
dc.contributor.authorSchmidt, V. Hugo
dc.contributor.authorChien, R.-M.
dc.contributor.authorGuo, Ruyan
dc.contributor.authorBhalla, A.S.
dc.date.accessioned2019-02-08T19:06:18Z
dc.date.available2019-02-08T19:06:18Z
dc.date.issued1998
dc.identifier.citationC.-S. Tu, Y.-L. Yeh, R.S. Katiyar, Ruqian Guo, V.H. Schmidt, R.-M. Chien, Ruyan Guo, and A.S. Bhalla, “Optical properties of RbTiOAsO4 single crystal,” Journal of the Korean Physical Society 32, 472-475 (1998).en_US
dc.identifier.issn0374-4884
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/15243
dc.description.abstractRubidium titanyl arsenate (RbTiOAsO4) belongs to the family of nonlinear optical crystals with the general formula M1+TiOX5+O4, where M = K, Rb, Tl, Cs and X = P, As. [1–6] The high damage threshold and broad angular acceptance have made such crystals attractive materials for frequency doubling of Nd-based lasers at λ=1.064 and 1.32 µm, and for optical parametric oscillators (OPO). In addition, the ion exchange properties also make them one of the best candidates for waveguide applications. Potassium titanyl phosphate, KTiOPO4 (KTP), is the most popular among such materials and has been used successfully in different applications. However, the orthophosphate absorption at ∼4.3 and ∼3.5 µm in KTP severely limits the oscillator output power. In contrast, RTA has a broad infrared transparency (∼0.35-5.3 µm) and exhibits no overtone absorption between 3 and 5 µm. [4] This makes the RTA crystal a potential candidate for nonlinear optical applications. At room temperature, KTP-type crystals have an orthorhombic structure with non- centrosymmetric point group C2v (mm2) and space group Pna2 (Z=8). The crystal framework is a three-dimensional structure made from corner-linked TiO6 octahedra and PO4 tetrahedra. Four oxygen ions of the TiO6 belong to PO4 tetrahedral groups which link the TiO6 groups. In our earlier Raman results, a slight softening was exhibited by several LO and TO vibrational modes of RTA. [1,2] However, there is no typical soft mode observed in the lowfrequency modes of the Raman spectra. This motivated usto carryoutBrillouinscatteringmeasurements tolook for softening in the acoustic modes. We report here both the temperature-dependent acoustic phonon spectra and wavelength- dependent refractive indices. The Cauchy equations [n(λ) = A + B/λ2 + C/λ4] of nx, ny and nz are obtained. In particular, the first direct evidence for acoustic phonon soft mode is presented.en_US
dc.description.sponsorshipNSC86-2112-M-030-002 (R.O.C.); NSF Grant DMR-9520251; DOE Grant DE-FG02-94ER75764en_US
dc.language.isoenen_US
dc.rightsThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en_US
dc.titleOptical properties of RbTiOAsO4 single crystalen_US
dc.typeArticleen_US
mus.citation.extentfirstpage472en_US
mus.citation.extentlastpage475en_US
mus.citation.journaltitleJournal of the Korean Physical Societyen_US
mus.citation.volume32en_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentPhysics.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.data.thumbpage2en_US


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