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Article
Efficient ablation of organic polymers polyether sulphone and polyether ether ketone by a TEA CO2 laser with high perforation ability
Organic polymer (PES: PolyEther Sulphone and PEEK: PolyEther Ether Ketone) ablation with oscillation-line selected TEA CO2 lasers is successfully demonstrated. With different irradiation conditions the ablative e...
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Article
Wavelength-stable, narrow-spectral-width oscillation of an AlGaInP diode laser coupled to a BaTiO3:Co stimulated photorefractive backscattering phase conjugator
) stimulated photorefractive backscattering (SPBS) phase conjugator. The SPBS process was successfully achieved by the combination of the short-wavelength diode laser and the highly doped photorefractive BaTiO3:C...
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Article
Phase-matched third-harmonic generation by nonlinear phase shift in a hollow fiber
W/cm2 are introduced into a 1.8-cm hollow fiber in room air. From the observation of the third-harmonic beam quality and spectra, it is clarified that the harmonics are pumped at the leading edge of the fundamen...
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Article
Ablation characteristics of Au, Ag, and Cu metals using a femtosecond Ti:sapphire laser
Femtosecond laser ablation of metallic bulk crystals of Au, Ag and Cu was experimentally studied with laser pulse widths ranging from 120 fs through 800 fs at a center wavelength of 780 nm for micro-machining...
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Article
Combination of high-intensity femtosecond laser pulses for generation of time-dependent polarization pulses and ionization of atomic gas
Time-dependent polarization pulses are generated by combining two perpendicularly polarized, high-intensity laser pulses. The time evolution of the polarization state of the combined laser pulse is measured by...
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Article
Tailored ablation processing of advanced biomedical hydroxyapatite by femtosecond laser pulses
The micromachining of hydroxyapatite (HAp) is highly important for orthopedics and dentistry, since human bone and teeth consist mainly of HAp. We demonstrate ultrashort Ti:sapphire laser ablation of HAp, usin...
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Article
Pulsed-laser deposition of a Nd:KGd(WO4)2 waveguide in Ar and O2 environments
Thin-film Nd-doped potassium gadolinium tungstate (Nd:KGW or KGd(WO4)2) waveguides are deposited on (1102)sapphire or (100)YAG substrates by KrF laser ablation of potassium-rich ceramic targets in Ar and O2. The ...
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Article
Fabrication of Nd:KGW film on a Si substrate with a CeO2 buffer layer
Highly textured single-oriented (110) Nd-doped potassium gadolinium tungstate [Nd:KGd(WO4)2 or Nd:KGW] thin films were successfully fabricated on (100) Si substrate by introducing a (100) CeO2 buffer layer using ...
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Article
Control of the refractive index change in fused silica glasses induced by a loosely focused femtosecond laser
We demonstrate waveguide fabrication using of a loosely focused femtosecond laser that induces both nonlinear ionization and nonlinear propagation in silica glasses without any scanning process. The numerical ...
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Article
Materials processing by use of a Ti:Sapphire laser with automatically-adjustable pulse duration
We have developed an automatic pulsewidth-adjustable femtosecond Ti:Sapphire laser system that can generate an output of 50 fs-1 ps in duration, and sub-mJ/pulse at a repetition rate of 1 kpps. The automatic p...
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Article
Improvement of surface smoothness of Nd:KGd(WO4)2 films by nozzle-gas-assisted pulsed-laser deposition
We have demonstrated efficient film oxidation of Nd:KGW [or Nd:KGd(WO4)2] films using a newly developed nozzle-gas-assisted pulsed-laser deposition (NGA-PLD) method. This technique is systematically studied and e...
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Article
Nanostructuring of silicon surface by femtosecond laser pulse mediated with enhanced near-field of gold nanoparticles
Nanostructure fabrication on a silicon substrate using a near-field electromagnetic enhancement in the vicinity of gold nanoparticles is studied. Experimental and theoretical investigations are made in order t...
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Article
Tunable mid-infrared, high-energy femtosecond laser source for glyco-protein structure analysis
We have developed a 6–12 μm mid-infrared (MIR) femtosecond laser source for glyco-protein structure analysis. The MIR femtosecond laser pulses are generated by a differential frequency generation (DFG) configu...
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Article
Development of a highly stable Yb:YAG thin disk pulsed green laser for high power Ti:sapphire based amplifier at 100 kHz repetition rate
We have developed a pulsed Yb:YAG thin disk green laser for pum** a 100 kHz and 10 W femtosecond laser. We optimized numerically and experimentally the open duration of the acousto-optic (AO) Q-switcher and ...
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Article
Extremely selective modal oscillation of random lasing induced by strong multiple scattering
We report on a new physical aspect of random lasing, an extremely selective modal oscillation by using a two-dimensional calculation model. The developed model consists of two theoretical subsystems, two-dimen...
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Article
Femtosecond-laser nanofabrication onto silicon surface with near-field localization generated by plasmon polaritons in gold nanoparticles with oblique irradiation
Nanohole fabrication process with gold nanoparticles irradiated by femtosecond laser at different incident angles is investigated. Nanoparticles with diameter of 200 nm and laser irradiation with center wavele...
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Article
Tuneabilities of localized electromagnetic modes in random nanostructures for random lasing
The modal characteristics of localized electromagnetic waves inside random nanostructures are theoretically presented. It is crucial to know the tuneabilities of the localized modes systematically for demonstr...
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Article
Order to disorder optical phase transition in random photonic crystals
Transition process of optical modal properties induced by the introduction of randomness into random photonic crystals is investigated by a computational method. We analyze an impulse response of two-dimension...
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Article
High-intensity near-field generation for silicon nanoparticle arrays with oblique irradiation for large-area high-throughput nanopatterning
We present near-field distributions around an isolated 800-nm silica or silicon nanoparticle, and nanoparticle arrays of 800-nm silica or silicon nanoparticles, on a silicon substrate by the finite-difference ...