Optical Head Design Using HOE's

C. S. Ih; L. Q. Xiang; B. H. Zhuang; C. W. Yang; K. Q. Lu; R. S. Tian; Z. M. Wang

doi:10.1117/12.951503

6 May 1989 Optical Head Design Using HOE's

C. S. Ih, L. Q. Xiang, B. H. Zhuang, C. W. Yang, K. Q. Lu, R. S. Tian, Z. M. Wang

Proceedings Volume 1052, Holographic Optics: Optically and Computer Generated; (1989) https://doi.org/10.1117/12.951503
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

We describe an optical head design using two spherical lenses and two HOE's. This study was intended to show the feasibility of using HOE's to improve the performance of optical head for Read/Write optical disc drives. The two HOE's correct the spherical aberrations of the lens, change the elliptical beam to a circular one and compensate for wavelength shift up to +, - 5 nm. Experiments have been performed to confirm these concepts. The HOE's were made optically in the visible wavelength using an intermediate CGH. Ideally the HOE's are to be generated by a computer and preferably written directly by an e-beam machine. Since at that time all the commercially available e-beam shops we contacted lacked the confidence in making such high resolution CGH, we decided to use the Optical-CGH approach. Actually this approach offers several advantages. First we can make large and high resolution ir HOE immediately. Secondly we can even make Bragg (or volume) ir hologram using visible light. Basically we create a pre-distorted CGH from which the final HOE can be made using visible light. The final HOE can then be reconstruct at the ir wavelength without aberrations. The techniques used here can be extended to optical head designs using aspherical lenses. The HOE's function can then be, in addition to beam shaping, to achieve a larger wavelength compensation, to correct the residual chromatic and aspherical aberrations of the aspherical lenses. The astigmatism of the laser diode can also be corrected by the HOE's. The possibility of an optical head using only HOE's (no lenses) will be discussed. Computer simulations and experimental results are shown.

Citation Download Citation

C. S. Ih, L. Q. Xiang, B. H. Zhuang, C. W. Yang, K. Q. Lu, R. S. Tian, and Z. M. Wang "Optical Head Design Using HOE's", Proc. SPIE 1052, Holographic Optics: Optically and Computer Generated, (6 May 1989); https://doi.org/10.1117/12.951503

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