Versatile polychromatic dynamic testbed for optical disks

Masud Mansuripur, Chubing Peng, J. Kevin Erwin, Warren Bletscher, Soon Gwang Kim, Seh Kwang Lee, Ronald E. Gerber, Chanda Bartlett, Timothy D. Goodman, Lu Cheng, Chong Sam Chung, Taekyung Kim, Keith Bates

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A dynamic testbed for the evaluation of optical disks has been designed and constructed. The system is achromatic within the wavelength range 440-690 nm, allowing any light source in this range to be utilized for read-write-erase experiments. In addition, the system accepts disks with substrate thicknesses ranging from 0 to 1.7 mm. The polarization handling capabilities of the testbed are such that, with the turn of a knob, one can generate either linearly polarized or circularly polarized light at the disk surface. This feature permits the testing of both magneto-optical and phase-change disks, in addition to compact disks and digital versatile disks, without any modifications to the system. A leaky polarizing beam splitter (LPBS) has been specially designed and built for this tester. The LPBS allows continuous adjustment of the ratio between p- and s-polarized components of the reflected beam that reach the detectors. This feature is especially useful for magneto-optical disks, where one can achieve an optimum signal-to-noise ratio by adjusting the relative amounts of the two components of polarization at the detection module. Focus-error detection is based on the astigmatic method, and the primary track-error detection scheme is the push-pull method, although other focusing and tracking schemes may also be implemented. The rf data signal and the focusing and tracking servo signals are all derived from the same detectors, thus allowing the optical power returning from the disk to be used in its entirety for these multiple purposes. The detection channel consists of two high-speed quad detectors mounted on the two arms of a differential detection module. By combining the various outputs of these detectors it is possible to generate the astigmatic focus-error signal, the push-pull track-error signal, the differential magneto-optical readout signal, the conventional sum signal for phase-change disk readout, and the differential edge-signal for mark-edge detection on various types of optical media.

Original languageEnglish (US)
Pages (from-to)9296-9303
Number of pages8
JournalApplied Optics
Volume36
Issue number35
StatePublished - 1997

Fingerprint

optical disks
Testbeds
Detectors
Error detection
error signals
Polarization
Knobs
detectors
beam splitters
Edge detection
Light polarization
readout
Light sources
modules
adjusting
Signal to noise ratio
knobs
edge detection
Wavelength
polarization

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Mansuripur, M., Peng, C., Kevin Erwin, J., Bletscher, W., Kim, S. G., Lee, S. K., ... Bates, K. (1997). Versatile polychromatic dynamic testbed for optical disks. Applied Optics, 36(35), 9296-9303.

Versatile polychromatic dynamic testbed for optical disks. / Mansuripur, Masud; Peng, Chubing; Kevin Erwin, J.; Bletscher, Warren; Kim, Soon Gwang; Lee, Seh Kwang; Gerber, Ronald E.; Bartlett, Chanda; Goodman, Timothy D.; Cheng, Lu; Chung, Chong Sam; Kim, Taekyung; Bates, Keith.

In: Applied Optics, Vol. 36, No. 35, 1997, p. 9296-9303.

Research output: Contribution to journalArticle

Mansuripur, M, Peng, C, Kevin Erwin, J, Bletscher, W, Kim, SG, Lee, SK, Gerber, RE, Bartlett, C, Goodman, TD, Cheng, L, Chung, CS, Kim, T & Bates, K 1997, 'Versatile polychromatic dynamic testbed for optical disks', Applied Optics, vol. 36, no. 35, pp. 9296-9303.
Mansuripur M, Peng C, Kevin Erwin J, Bletscher W, Kim SG, Lee SK et al. Versatile polychromatic dynamic testbed for optical disks. Applied Optics. 1997;36(35):9296-9303.
Mansuripur, Masud ; Peng, Chubing ; Kevin Erwin, J. ; Bletscher, Warren ; Kim, Soon Gwang ; Lee, Seh Kwang ; Gerber, Ronald E. ; Bartlett, Chanda ; Goodman, Timothy D. ; Cheng, Lu ; Chung, Chong Sam ; Kim, Taekyung ; Bates, Keith. / Versatile polychromatic dynamic testbed for optical disks. In: Applied Optics. 1997 ; Vol. 36, No. 35. pp. 9296-9303.
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