1 January 2007 Diffractive infrared lens with extended depth of focus
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An infrared imaging lens that produces beams with long focal depth while preserving the entire aperture for full light capturing and high transverse resolution is presented. Based on the conjugate-gradient algorithm, a diffractive optical lens with four times depth of focus improvement at the 10.6-μm wavelength has been designed and fabricated. ZEMAX simulation has confirmed the designed lens performance showing legible images over an extended image range. Through laser direct-write photoresist patterning and subsequent reactive ion etching on a germanium substrate, we have realized a diffractive lens with four times depth of focus improvement over a conventional infrared lens of the same numerical aperture. The extended depth of focus lens should yield a variety of applications in focus-free imaging without reducing lens aperture.
© (2007) Society of Photo-Optical Instrumentation Engineers (SPIE)
Zhiqiang Liu, Zhiqiang Liu, Angel Flores, Angel Flores, Michael R. Wang, Michael R. Wang, Jianwen J. Yang, Jianwen J. Yang, } "Diffractive infrared lens with extended depth of focus," Optical Engineering 46(1), 018002 (1 January 2007). https://doi.org/10.1117/1.2430506 . Submission:


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