LASER DIODE ILLUMINATOR DEVICE AND METHOD FOR OPTICALLY CONDITIONING THE LIGHT BEAM EMITTED BY THE SAME
First Claim
1. A laser diode apparatus for illumination having a predetermined maximum laser output power, said apparatus comprising:
- (a) a plurality of laser diode bars packaged in the form of at least one stacked laser diode array, said array radiating a two-dimensional array of laser beamlets,(b) a plurality of micro-optics devices for perfoming collimation of the beamlets along the fast axis of said laser diode bars, and for interchanging the divergences of said beamlets along the orthogonal fast and slow axes, the number of said micro-optics devices being equal to the number of said laser diode bars,(c) a plurality of cylindrical microlenses for performing collimation along the slow axis of the beamlets exiting from said micro-optics devices, the number of said cylindrical microlenses being equal to the number of said laser diode bars,(d) means for supplying electrical power to said at least one stacked laser diode array and for controlling its operation,wherein the total number of said laser diode bars used in said laser diode apparatus for illumination is selected large enough to radiate said predetermined maximum laser output power.
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Accused Products
Abstract
A laser diode illuminator device and a method for optically conditioning the output beam radiated from such a device, so that highly-demanding illumination application requirements that call for high output powers within a specified field of illumination can be addressed. At the heart of the device is a two-dimensional stack of laser diode bars wherein the linear array of beamlets radiated by each laser diode bar is optically conditioned through its passage in a refractive-type micro-optics device followed by a cylindrical microlens. The micro-optics device performs collimation of the linear array of beamlets along the fast axis of the bars, and it also acts as a beam symmetrization device by interchanging the divergences of the laser beamlets along the fast and slow axes. The cylindrical microlens is for collimation of the beamlets along the slow axis. The optical conditioning is performed individually for each linear array of beamlets so that the radiance or brightness of the laser diode illuminator can be optimized while any specified field of illumination can be filled with an excellent uniformity of the radiant intensity.
39 Citations
8 Claims
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1. A laser diode apparatus for illumination having a predetermined maximum laser output power, said apparatus comprising:
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(a) a plurality of laser diode bars packaged in the form of at least one stacked laser diode array, said array radiating a two-dimensional array of laser beamlets, (b) a plurality of micro-optics devices for perfoming collimation of the beamlets along the fast axis of said laser diode bars, and for interchanging the divergences of said beamlets along the orthogonal fast and slow axes, the number of said micro-optics devices being equal to the number of said laser diode bars, (c) a plurality of cylindrical microlenses for performing collimation along the slow axis of the beamlets exiting from said micro-optics devices, the number of said cylindrical microlenses being equal to the number of said laser diode bars, (d) means for supplying electrical power to said at least one stacked laser diode array and for controlling its operation, wherein the total number of said laser diode bars used in said laser diode apparatus for illumination is selected large enough to radiate said predetermined maximum laser output power. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for generating a laser beam for use in light illumination applications, comprising the steps of:
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(a) providing a stacked laser diode array made up of a plurality of laser diode bars, the number of said laser diode bars being selected so that the specified maximum output power can be radiated, (b) optically registering a first micro-optics device to the linear array of laser beamlets radiated by a first laser diode bar of said stacked laser diode array, said micro-optics device performing collimation along the fast axis and interchange of the fast-axis and slow-axis divergences of said linear array of laser beamlets, (c) repeating step (b) for the linear array of laser beamlets radiated by each individual laser diode bar of said plurality of laser diode bars, (d) securing a support structure to said stacked laser diode array, said support structure having a front face, (e) optically registering a first cylindrical microlens to a first linear array of laser beamlets exiting from said first micro-optics device, said first cylindrical microlens performing collimation along the slow axis of said first linear array of laser beamlets, (f) repeating step (e) for the linear array of laser beamlets exiting from each of said micro-optics devices, (g) driving said stacked laser diode array at a drive current selected to get the desired optical output power, whereby the combined actions of said micro-optics devices and said cylindrical microlenses enable optical conditioning of the plurality of laser beamlets emitted from said stacked laser diode array to radiate an output laser beam having the desired optical power while its radiant intensity profile in the far field fills any specified field of illumination with the desired uniformity within said field of illumination.
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8. A method for generating a laser beam having a predetermined output power for use in light illumination applications, comprising the steps of:
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(a) mounting a first laser diode bar in a submount compatible with a rack-and-stack array packaging architecture, (b) optically registering a first micro-optics device to the linear array of laser beamlets radiated by said first laser diode bar mounted in said submount, said micro-optics device performing collimation along the fast axis and interchange of the fast-axis and slow-axis divergences of said linear array of laser beamlets, (c) repeating steps (a) and (b) for a plurality of laser diode bars, the number of laser diode bars being selected so that the predetermined output power can be radiated, (d) packaging the plurality of laser diode bars according to a rack-and-stack array packaging architecture to provide a stacked laser diode array, (e) securing a support structure to said stacked laser diode array, said support structure having a front face, (f) optically registering a first cylindrical microlens to a first linear array of laser beamlets exiting from said first micro-optics device, said first cylindrical microlens performing collimation along the slow axis of said first linear array of laser beamlets, (g) repeating step (f) for the linear array of laser beamlets exiting from each of said micro-optics devices, (h) driving said stacked laser diode array at a drive current selected to get the desired optical output power, whereby the combined actions of said micro-optics devices and said cylindrical microlenses enable optical conditioning of the plurality of laser beamlets emitted from said stacked laser diode array to radiate an output laser beam having the desired optical power while its radiant intensity profile in the far field fills any specified field of illumination with the desired uniformity within said field of illumination.
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Specification