TY  - JOUR
A1  - Buchen, Johannes
A1  - Wesemann, Volker
A1  - Dehmelt, Steffen
A1  - Gross, Andreas
A1  - Rytz, Daniel
T1  - Twins in YAl3(BO3)4 and K2Al2B2O7 crystals as revealed by changes in optical activity
T2  - Crystals
N2  - Many borate crystals feature nonlinear optical properties that allow for efficient frequency conversion of common lasers down into the ultraviolet spectrum. Twinning may degrade crystal quality and affect nonlinear optical properties, in particular if crystals are composed of twin domains with opposing polarities. Here, we use measurements of optical activity to demonstrate the existence of inversion twins within single crystals of YAl3(BO3)4 (YAB) and K2Al2B2O7 (KABO). We determine the optical rotatory dispersion of YAB and KABO throughout the visible spectrum using a spectrophotometer with rotatable polarizers. Space-resolved measurements of the optical rotation can be related to the twin structure and give estimates on the extent of twinning. The reported dispersion relations for the rotatory power of YAB and KABO may be used to assess crystal quality and to select twin-free specimens.
KW  - NLO crystals
KW  - frequency conversion
KW  - second harmonic generation
KW  - YAB
KW  - YAl3(BO3)4
KW  - KABO
KW  - K2Al2B2O7
KW  - optical activity
KW  - optical rotatory dispersion
KW  - inversion twin
KW  - Lasertechnologie
KW  - Wellenlänge
KW  - Kristall
KW  - NLO-Kristall
KW  - YAB
KW  - Nichtlineare Optik
KW  - Frequenzumsetzung
KW  - Frequenzverdopplung
KW  - Rotationsdispersion
Y1  - 2018
UR  - https://hst.opus.hbz-nrw.de/frontdoor/index/index/docId/253
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:tr5-2530
VL  - 9
IS  - 1
SP  - 1
EP  - 13
PB  - MDPI
ER  -