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Proceedings Paper

Waveguide fabrication in PMMA using a modified cavity femtosecond oscillator
Author(s): Ke Wang; Denis Klimov; Zbigniew Kolber
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Paper Abstract

Poly Methyl Methacrylate (PMMA) is an advantageous material than glass in oceanographic sensing applications because of its inhospitality for marine organisms. Waveguide sensors fabricated in PMMA are often used to measure the parameters in ocean such as PH, CO2, O2 concentrations, etc. A tightly-focused femtosecond laser is often used to produce such a waveguide or even more complicated structures through the nonlinear effect in the bulk of PMMA, with pulse energy at μJ or mJ level. And such a laser system requires the amplifier from chirped-pulse amplification (CPA). The oscillator itself can produce pulse energy only at nJ level which is under the threshold of nonlinear effect. However, in our experiment, a modification to the oscillator cavity, which elongates the cavity length approximately 3 times and as a result, decreases the repetition rate from 93mHz to 32 mHz, can increase the pulse energy to 15 nJ. Under a tight focusing lens (100x 1.40 microscope objective), such an intensity exceeds the nonlinear threshold of PMMA. Thus, waveguide can be fabricated in PMMA using only a femtosecond oscillator and oceanographic sensors can be also made by this simple technique.

Paper Details

Date Published: 25 September 2007
PDF: 5 pages
Proc. SPIE 6766, Optoelectronic Devices: Physics, Fabrication, and Application IV, 67660Q (25 September 2007); doi: 10.1117/12.742094
Show Author Affiliations
Ke Wang, Monterey Bay Aquarium Research Institute (United States)
Denis Klimov, Monterey Bay Aquarium Research Institute (United States)
Zbigniew Kolber, Monterey Bay Aquarium Research Institute (United States)

Published in SPIE Proceedings Vol. 6766:
Optoelectronic Devices: Physics, Fabrication, and Application IV
Joachim Piprek; Jian J. Wang, Editor(s)

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