Thomas, Timothy and Rossman, George R. and Sandstrom, Mark (2014) Device and method of optically orienting biaxial crystals for sample preparation. Review of Scientific Instruments, 85 (9). Art. No. 093105. ISSN 0034-6748. doi:10.1063/1.4894555. https://resolver.caltech.edu/CaltechAUTHORS:20141113-090304482
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Abstract
An optical instrument we refer to as the “biaxial orientation device” has been developed for finding the optical plane, acute bisectrix, and obtuse bisectrix in biaxial crystals by means of optically aligning conoscopically formed melatopes and measuring the angular coordinates of the melatopes, where the angular values allow for determination of the optical plane containing the optical axes using a vector algebra approach. After determination of the optical plane, the instrument allows for the sample to be aligned in the acute bisectrix or obtuse bisectrix orientations and to be transferred to a simple mechanical component for subsequent grinding and polishing, while preserving the orientation of the polished faces relative to the optical plane, acute bisectrix, and obtuse bisectrix during the grinding and polishing process. Biaxial crystalline material samples prepared in the manner are suitable for accurate spectroscopic absorption measurements in the acute bisectrix and obtuse bisectrix directions as well as perpendicular to the optical plane.
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| Additional Information: | © 2014 AIP Publishing LLC. Received 14 May 2014; accepted 23 August 2014; published online 8 September 2014. The authors would like to thank the Gemological Institute of America for their support and J. L. Emmett for his contributions related to the uniaxial conoscope, and NSF Grant No. EAR-1322082 to G.R.R. | |||||||||
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| Issue or Number: | 9 | |||||||||
| DOI: | 10.1063/1.4894555 | |||||||||
| Record Number: | CaltechAUTHORS:20141113-090304482 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141113-090304482 | |||||||||
| Official Citation: | Device and method of optically orienting biaxial crystals for sample preparation Thomas, Timothy and Rossman, George R. and Sandstrom, Mark, Review of Scientific Instruments, 85, 093105 (2014), DOI:http://dx.doi.org/10.1063/1.4894555 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 51699 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 13 Nov 2014 19:25 | |||||||||
| Last Modified: | 10 Nov 2021 19:14 |
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