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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 32 — Nov. 10, 2001
  • pp: 5872–5876

Hybrid microdiffractive–microrefractive lens with a continuous relief fabricated by use of focused-ion-beam milling for single-mode fiber coupling

Yong-qi Fu and Ngoi Kok Ann Bryan  »View Author Affiliations


Applied Optics, Vol. 40, Issue 32, pp. 5872-5876 (2001)
http://dx.doi.org/10.1364/AO.40.005872


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Abstract

The design, microfabrication, and testing of a hybrid microdiffractive–microrefractive lens with a continuous relief that is used with a laser diode for monomode fiber coupling is discussed. The hybrid microlens with a diameter as small as 65 µm and a numerical aperture of 0.25 is fabricated directly onto a spherical surface by use of focused-ion-beam milling technology. A focused Ga+ ion beam is used to mill the continuous relief microstructure at an acceleration voltage of 50 kV. From the test results a coupling efficiency of 71% (-1.49 dB) was achieved at room temperature. A diffraction efficiency of the main diffractive order, -1, was measured to as high as 90.5% at a wavelength of 635 nm. This indicates that the hybrid microlens was suitably designed within the application requirements and satisfactorily manufactured with focused-ion-beam milling.

© 2001 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(060.2340) Fiber optics and optical communications : Fiber optics components
(220.0220) Optical design and fabrication : Optical design and fabrication

History
Original Manuscript: July 1, 2000
Revised Manuscript: April 3, 2001
Published: November 10, 2001

Citation
Yong-qi Fu and Ngoi Kok Ann Bryan, "Hybrid microdiffractive–microrefractive lens with a continuous relief fabricated by use of focused-ion-beam milling for single-mode fiber coupling," Appl. Opt. 40, 5872-5876 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-32-5872

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