Reflectivity-modulated grating-mirror

Il-Sug Chung (Inventor)

Research output: Patent


The invention relates to vertical cavity lasers (VCL) incorporating a reflectivity-modulated grating mirror (1) for modulating the laser output. A cavity is formed by a bottom mirror (4), an active region (3), and an outcoupling top grating mirror (1) formed by a periodic refractive index grating region in a layer structure comprising a p- and a n-doped semiconductor layer with an electrooptic material layer (12) arranged there between. The grating region comprises a grating structure formed by periodic perforations to change the refractive index periodically in directions normal to the oscillation axis. A modulated voltage (91) is applied in reverse bias between the n- and p-doped layers to modulate the refractive index of the electrooptic material layer (12) and thereby the reflectivity spectrum of the grating mirror (1). The reflectivity of the grating mirror (1) can be modulated between a reflectivity with little or no out coupling and a reflectivity with normal out coupling, wherein lasing in the VCL is supported at both the first and the second reflectivity. As the out coupling mirror modulates the output, the lasing does not need to be modulated, and the invention provides the advantage of lower power consumption at high modulation speeds.
Original languageEnglish
Patent numberWO2012155911
Filing date22/11/2012
CountryInternational Bureau of the World Intellectual Property Organization (WIPO)
Priority date17/05/2011
Priority numberUS201161486930P
Publication statusPublished - 2012

Bibliographical note

Also published as: EP2525450 (A1), US2014219301 (A1); KR20140059762 (A), CN103597676 (A)


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