Method for performing eye safety measurements on laser...

Details Method for performing eye safety measurements on laser... Method for performing eye safety measurements on laser...

2005-03-04

2008-03-18

Rodriguez, Armando (Department: 2828)

Coherent light generators

Particular beam control device

Optical output stabilization

C372S038020

Reexamination Certificate

active

07346087

ABSTRACT:
A method of performing eye safety measurements on laser devices is disclosed. The laser is contained within a housing having a central bore. The method uses an optical detector having at least two zones to make separate measurements of both a direct power coming from the laser and an indirect power reflected off of the central bore. The first zone measuring the direct power is smaller than the second zone measuring the indirect power. The measurement of the first power is then used to adjust the power of the laser to be within a specified optical standard, such as the class 1 standard. In one exemplary embodiment, the laser is an 850 nanometer Vertical Cavity Surface Emitting Laser (VCSEL).

REFERENCES:
patent: 7065112 (2006-06-01), Ghosh et al.
patent: 2002/0075910 (2002-06-01), Imaki et al.
patent: 2004/0081466 (2004-04-01), Walther et al.
patent: 2006/0176800 (2006-08-01), Colbum et al.
Boucouvalas, et al., “IEC 825-1 Eye Safety Classification of Some Consumer Electronic Products,” Bournemouth University, School of Electronics, pp. 1-3.
Boucouvalas, et al., “Appendix: Sample Calculations,” Bournemouth University, School of Electronics, pp. 4-6.
“OFCS Power Limits,” IEC, 2004, pp. 22-28.

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