Optical design in high density and high capacity multi-layer data storage system

doi:10.1007/s12200-014-0416-4

Front. Optoelectron.

2014, Vol. 7

Issue (4) : 425-436 https://doi.org/10.1007/s12200-014-0416-4

RESEARCH ARTICLE

Optical design in high density and high capacity multi-layer data storage system

Yuzuru TAKASHIMA(

)

College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA

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Abstract

Fundamental requirements for optical system design for volume recording system is identified. Anastigmatic objective lens design is required for conventional page-based system, whereas for multi-layer volume recording systems, an Aplanatic and zoom optical design is needed with an afocal sub-optical system including a high numerical aperture (NA) objective element. An NA 0.4 and four element design is feasible by only using off-the-shelf components. Recording depth ranges of 0.4 mm for wavelength 532 nm and 0.2 mm for 405 nm. The design demonstrates sufficiently small as-built wavefront error, less than 0.1 waves while implementing focusing and tracking capabilities to the design.

Keywords holographic and volume memories lens system design optical disks

Corresponding Author(s): Yuzuru TAKASHIMA

Just Accepted Date: 18 September 2014 Online First Date: 17 November 2014 Issue Date: 12 December 2014

Cite this article:

Yuzuru TAKASHIMA. Optical design in high density and high capacity multi-layer data storage system[J]. Front. Optoelectron., 2014, 7(4): 425-436.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-014-0416-4
https://academic.hep.com.cn/foe/EN/Y2014/V7/I4/425

Fig.1 (a) Schematic of volume holographic recording with interchangeable media; (b) in the lens system, two kinds of imaging are involved, the object imaging (solid line) and the pupil imaging (dashed line). SLM: spatial light modulator; CCD: charge coupled device

Tab.1 Relations between object and pupil aberrations

Fig.2 Design example of Anastigmatic lens for volume holographic recording using for (a) NA=0.7 (N=1.59219); (b) NA=0.75 (N=1.85078) and (c) NA=0.8 (N=2.15858). A strong negative surface close to the Fourier plane improves object imaging 2.2. Saggital (S) and tangential (T) field aberration are plotted for each of the design

Fig.3 Schematic of 1st order power arrangement of objective zoom lens for multi-layer recording. WD: working distance

Fig.4 Power arrangement of conventional variable focus depth objectives

Fig.5 Powerful arrangement of variable focus depth objectives with a constant focal length

Fig.6 Power arrangement of the three elements zoom objective design

Fig.7 Power arrangement of the three elements zoom objective with afocal design

Fig.8 Power arrangement of the variable focusing depth system having a constant focal length

Fig.9 Schematic diagram of multi-layer micro holographic data storage

Fig.10 Schematic diagram of multi-layer holographic recording demonstration platform. (a) Disc structure; (b) recording system. LD: laser diode; QD: quad detector; PBS: polarization beam splitter; EOM: electro optics modulator; DPSS: diode pumped solid state laser; QWP: quarter wave plate; HWP: half wave plate

Fig.11 Design results, writing and readout optics for 532 nm wavelength

Fig.12 Design results, tracking and focusing optics for 658 nm wavelength

Tab.2

Tab.3 Paraxial data of the reference path system for 532 nm

Tab.4 Summary of design specifications and results

Fig.13 Result of tolerance analysis. As built performance as a function of recording depth for objective (arm 1) and reference (arm 2) optical path

Tab.5 Design specifications and design results for 405 nm wavelength

Fig.14 Design results, writing and readout optics for 405 nm wavelength

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