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Accurate measurement of reflectivity over wavelength of a laser diode antireflection coating using an external cavity laser

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1 Author(s)
Stokes, Loren F. ; Hewlett-Packard Lightwave Oper., Santa Rosa, CA, USA

A method for measuring laser diode facet antireflection coating over wavelength is presented. The laser diode is coupled to a wavelength-selective external cavity, and laser threshold current over the wavelength region of interest is measured. The coating reflectivity over wavelength is derived from the threshold current data. Reflectivities as low as 1×10-5 have been measured with good fit over wavelength to an ideal single layer coating. The net external cavity feedback is also determined. An estimate of the accuracy of the reflectivity measurement is made

Published in:

Lightwave Technology, Journal of  (Volume:11 ,  Issue: 7 )

Date of Publication:

Jul 1993

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