Search for content and authors
 

Crystal Growth, Crystalline Perfection And Optical Property Analyses Of Ru Doped Congruent LiNbO3 Single Crystals At Different Axial Positions

Bright Riscob 1,2Sarveswaran Ganeshamoorthy 3Rajeev Bhatt 4Narayanasamy Vijayan 1Indranil Bhaumik 4Mohd A. Wahab 2Godavarthi Bhagavannarayana 1

1. National Physical Laboratory (NPL), Dr.K.S.Krishnan Road, Delhi 110012, India
2. Jamia Millia Islamia (JMI), Jamia Nagar,new delhi, Delhi 110025, India
3. X ray Crystallography and Crystal Growth Section, Condensed Matter Physics Division, Material Science Group, IGCAR (IGCAR), Kalpakkam, Tamil Nadu, Chennai 603 102, India
4. Laser Materials Development and Devices Division, Raja Ramanna Centre for Advanced Technology (RRCAT), Indore 452013, India

Abstract

The good quality single crystals of Ru doped congruent LiNbO3 (LN) have been successfully grown by Czochralski (Cz) technique using Cyberstar make automatic diameter controlling system with RF furnace. The axial and radial gradient of the RF furnace was controlled properly in order to get crack free single crystal. The wafer was cut from the grown single crystals at different axial positions and then subjected to various characterization analyses in order to find its suitability for device fabrications. The concentration of the dopant was assessed by inductively coupled plasma mass spectroscopy (ICP-MS) and found that upper portion of the wafer contains more Ru in comparison with the other part of the wafers, which was expected because of Ru evaporation and it is in agreement with the reported literatures. To assess the crystalline perfection, the wafers which were cut from the different axial positions were subjected to high-resolution X-ray diffractometry (HRXRD) by employing an in-house developed multicrystal X-ray diffractometer. From this analysis one can understand that the as-grown cLN crystal is having excellent perfection with single and sharp diffraction curve (DC), whereas, Ru-doped specimens can be clearly visualized by the broadening of DC. The top and bottom portions of the same ingot show distinct nature of defect structure. The significant change observed in the absorption coefficient and band gap analysis proven that the concentration variation of Ru play a major role in LN application. The refractive index measurements were carried out to observe Ru effect on different pieces of crystal while concentration varies using a prism coupler technique.  The optical homogeneity of the grown specimen was examined by using conoscopy method and observed that the grown crystals are having good optical homogeneity, free from residual strain and at the same time Ru doping does not influence its optic sign.

 

Legal notice
  • Legal notice:
 

Related papers

Presentation: Poster at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, General Session 2, by Bright Riscob
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-01-03 08:43
Revised:   2013-07-29 10:18