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We report on fabrication of high-Q (i.e., a quarter million) lithium niobate whispering-gallery-mode microresonators using femtosecond laser micromachining. Second harmonic generation with a normalized conversion efficiency of 1.35×10−5/mW has been experimentally demonstrated.
The evolution of nanogratings in a porous glass was directly observed, revealing that the nanogratings origin from the standing plasma waves at the interfaces excited by femtosecond laser pulses.
We experimentally investigate gain dynamics and temporal characteristics of a free-space nitrogen laser pumped by circularly-polarized femtosecond laser pulses based on the pump-probe scheme.
Various means for coupling light from fiber core waveguide is examined to enable integration with fiber cladding optical circuits written by oil-immersion with femtosecond lasers. Coreless optical fiber and in-fiber Mach Zehnder interferometers are introduced.
We report on controllable production of 3D high-aspect-ratio (length to width ratio > 1,000) nanochannel with a width of ∼40 nm in glass by femtosecond laser direct writing, and demonstrate its applicability for DNA analysis.
We report on fabrication of ultra-high-Q (∼106) whispering gallery microcavities on a fused silica chip using a femtosecond laser, enabled by the high spatial resolution and three-dimensional nature of femtosecond laser direct writing.
We spectrally broaden 1-ps pulses from a 14.3-W, 10.6-MHz thin-disk laser in a 30.5-cm long Xe-filled HC-PCF. After compression, we achieve 9.1-W in 470-fs pulses (63% overall efficiency). No depolarization or damage is observed.
We have examined a femtosecond pulse shaping phenomenon induced by self-organized Ag nanoparticle arrays. Significant pulse shortening was observed as plasmon resonance occurs between the array and femtosecond pulses.
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