Chirped lens-array LED spot-array generator with individually colored spots

Peter Schreiber; Peter Dannberg; Frank Wippermann

doi:10.1117/12.854415

13 May 2010 Chirped lens-array LED spot-array generator with individually colored spots

Peter Schreiber, Peter Dannberg, Frank Wippermann

Proceedings Volume 7716, Micro-Optics 2010; 771617 (2010) https://doi.org/10.1117/12.854415
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available