Growth of MM-Thick Orientation-Patterned GaAs for IR and THZ Generation
Abstract
Low-pressure hydride vapor phase epitaxy (HVPE) is being used for the regrowth of thick GaAs on orientation-patterned templates for nonlinear optical frequency conversion. We have achieved epitaxial growth rates of 200um/h and produced millimeter-thick films in 10-h-long growth runs. A critical problem in the HVPE regrowth of orientation-patterned GaAs is the preservation of the original patterned structure - during thick growth, the domain walls often bend and annihilate. Measurements indicated that the domain wall bending decreased as the growth temperature was reduced. The substrate miscut and the orientation of unpatterned regions also affect the vertical propagation of domain walls. In this paper we discuss the process improvements which have facilitated the production of millimeter-thick layers with nearly vertical domain walls.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 30, 2008
- Accession Number
- ADA506498
Entities
People
- Alex Lin
- Christene Lynch
- D. F. Bliss
- J. S. Harris
- M. M. Fejer
- P. S. Kuo
- T. Zens
Organizations
- Air Force Research Laboratory