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13 May 2010 Chirped lens-array LED spot-array generator with individually colored spots
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Abstract
State-of-the-art high brightness LEDs offer optical powers of about one watt and span a wide wavelength range - clearly outperforming usual single mode laser diodes. Thus, LEDs excel in applications where beam quality - the main advantage of lasers - is not the decisive criteria and/or speckle are critical. For a LED illuminated spot array generator a pupil splitting design approach with a lens-array is presented. Contrary to usual laser diode spot array generators with diffractive beamsplitters this design enables individually colored spots, suppresses unwanted speckle and increases beam quality with increasing spot number. Design rules and scaling laws are established, then the resulting system is analyzed with respect to useful transmission, beam quality and chromatic aberrations. We realized a 21x21 spot array generator with 40°x40° FOV using a simple plano-convex lens as projection optics. A chirped lens array with varying focal widths and pre-distorted lenslet positions corrects field curvature and distortion of the projection optics. Additional buried apertures and color filters suppress unwanted straylight and enable individually colored spots, respectively. The lens array is fabricated by replication of reflow master structures into polymer on glass.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Schreiber, Peter Dannberg, and Frank Wippermann "Chirped lens-array LED spot-array generator with individually colored spots", Proc. SPIE 7716, Micro-Optics 2010, 771617 (13 May 2010); https://doi.org/10.1117/12.854415
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