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ABSTRACT: In this paper, we report the manipulation of multiple femtosecond filamentation using two single-step phase plates and their combinations. Not only can the number of filaments from one to four be controlled precisely, but also the phase relationship between these filaments, which consequently allowed us to control the corresponding one-dimensional to two-dimensional interference fringes of white light continuum.
Journal of Physics B Atomic Molecular and Optical Physics 10/2011; 44(21):215404. · 1.88 Impact Factor
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Fei He,
Ya Cheng,
Zhizhan Xu,
Yang Liao,
Jian Xu,
Haiyi Sun, Chen Wang,
Zenghui Zhou,
Koji Sugioka,
Katsumi Midorikawa,
Yonghao Xu,
Xianfeng Chen
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ABSTRACT: We demonstrate direct fabrication of homogeneous microfluidic channels embedded in fused silica by femtosecond laser direct writing, followed by wet chemical etching and glass drawing. In addition, the glass drawing process significantly reduces the inner surface roughness of the fabricated channels, and centimeter-level microfluidic channels with an aspect ratio above 1000 can be realized.
Optics Letters 02/2010; 35(3):282-4. · 3.40 Impact Factor
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ABSTRACT: We report on the fabrication of a microlens on a fused silica chip with excellent optical performance by femtosecond laser microfabrication. We show, both in theory and experimentally, that the fabricated microlens offers a high resolution approaching the optical diffraction limit. Moreover, two-photon excitation of fluorescence with the fabricated microlens is demonstrated. The lateral and axial resolutions of fluorescence are measured to be ∼ 1.7 and 12.3 μm, respectively.
Applied Physics Letters 01/2010; 96(4):041108-041108-3. · 3.84 Impact Factor
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ABSTRACT: The authors report the investigation of filament and supercontinuum generation by focusing a femtosecond laser beam into water doped with silver nanoparticles. The silver nanoparticles enhance the nonlinear optical response of water, leading to broadening of supercontinuum spectra in self-focused femtosecond filaments. During the propagation of the supercontinuum light in the filament, the silver nanoparticles preferentially scatter the short-wavelength light near the plasmon resonant wavelength peak, followed by the scattering of the long-wavelength light. Thus, a side view of the filament shows a full-color spectrum in the visible range, which is herein called “rainbow filament.”
Applied Physics Letters 05/2007; 90(18):181119-181119-3. · 3.84 Impact Factor
