Patent ID: 6829278
Filing Date: 2004-12-07
Classification: H01S

Abstract:
A light emitting device, having an input impedance and a device quantum efficiency, for generating at least two beams of output radiation from an input current of electrons comprising;at least two light emitting means for converting the input current of electrons into a beam of output radiation, each of the light emitting means having a respective optical waveguide and having an impedance and an individual quantum efficiency, wherein the light emitting means (i) are electrically connected in series such that the input impedance of the light emitting device is substantially equal to the sum of the impedances of the light emitting means and such that the quantum efficiency of the device is substantially equal to the sum of the quantum efficiencies of the light emitting means and (ii) are arranged optically such that the light emitting means do not share a common optical waveguide.