Holographic Optical Head
Abstract
An experimental optical head using Holographic Optical Elements (HOEs) has been set up in our laboratory. The observed reconstructed spot size is less than 2 micron in diameter. Wavelength tolerance is + or - 5nm centered at 832 nm. A new design using two aspherical lenses and two HOEs would operate over + or - 15 nm. The new design can be the basis of a practical, highly compact, and reliable optical head. Performance can be significantly enhanced by using an e-beam pattern generator to fabricate an intermediate computer generated hologram needed to process the working HOEs. This will simplify the fabrication procedure and greatly reduce fabrication errors. Significant progress has also been made in developing a technique to make high-efficiency volume IR holograms, whose diffraction efficiency may approach 100%. This technique is unique and has not been reported in the literature by other researchers. Continuing effort is recommended to use an e-beam pattern generator to fabricate the intermediate HOEs, to design and fabricate high efficiency. (KR)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1990
- Accession Number
- ADA229192
Entities
People
- Bofu Zheng
- Charles S. Ih
- P. G. Debaryshe