Microfabrication of Fresnel zone plates by laser induced solid ablation

Rodrigues, Vanessa RM and Thomas, John and Santhosh, Chidangil and Ramachandran, Hema and Mathur, Deepak (2016) Microfabrication of Fresnel zone plates by laser induced solid ablation. Journal of Optics, 18. pp. 1-7. ISSN 2040-8978

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A novel and simple single-step method of inscribing optical elements on metal-coated transparent substrates is demonstrated. Laser induced solid ablation (LISA) demands very low laser energies (nJ), as can be amply provided by a femtosecond laser oscillator. Here, LISA is used to write Fresnel zone plates on indium and tungsten coated glass. With up to 100 zones, remarkable agreement is obtained between measured and expected values of the focal length. LISA has enabled attainment of focal spot sizes that are 38% smaller than what would be obtained using conventional lenses of the same numerical aperture. The simplicity with which a high degree of automation can readily be achieved using LISA makes this cost-effective method amenable to a wide variety of applications related to microfabrication of optical elements.

Item Type: Article
Uncontrolled Keywords: Femtosecond laser-induced ablation; microfabrication; Fresnel zone plates; diffractive optics.
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Library
Date Deposited: 02 Jan 2018 06:16
Last Modified: 02 Jan 2018 06:16
URI: http://eprints.manipal.edu/id/eprint/150402

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