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We have demonstrated a beam scanning multi-photon multi-harmonic endoscope based on a flexible fiber bundle. Excited by a femtosecond Cr:Forsterite laser, multi-photon multi-harmonic excitation efficiencies are recovered without any external devices.
We observed the interference spectrum that depends on the carrier-envelope phase using a few-cycle laser pulse. The phenomenon is based on the interference between the second and third harmonics generated from a ZnO thin film.
Fiber-delivered laser source provides the flexibility desired for optical imaging systems. Here we demonstrate laser-scanning coherent anti-Stokes Raman scattering imaging with two picosecond laser sources delivered by large mode area photonic crystal fiber.
All-fiber chirped-pulse amplification based on a large-mode-area Er:Yb-doped photonic-crystal fiber is presented. A dispersion-variable hybrid fiber stretcher compensates the peculiar dispersion of the hollow-core photonic-bandgap fiber compressor yielding transform-limited 440-fs pulses with 1-W average power.
Noise structure and coherence of mid-IR supercontinua in fibers with strong Raman nonlinearity were investigated. It was established that the octave-spanning spectra retain very high degree of coherence in the presence of the enhanced nonlinearity.
Recent work in frequency-conversion of pulsed fiber-amplifiers is reviewed. Design criteria of frequency converters for fiber sources in operating the wavelength range between 1 um and 2 um are discussed.
We report a fiber laser that produces 25 nJ, sub-200 fs pulses, an energy 60% higher than previous reports. We attribute the improvement to increased pump power and spectral filtering by the oscillatorpsilas waveplates.
Structural modification in gratings inscribed point-by-point by a femtosecond laser is investigated using quantitative phase microscopy. The gratings present a central region with a depressed refractive index surrounded by an outer corona with increased index.
Two mode-locked femtosecond fiber lasers, connected via a 7 km fiber link, are synchronized to an RMS timing jitter of 19 fs, observed over the entire Nyquist bandwidth (half of the repetition frequency of 100 MHz).
Similariton laser oscillators support much higher pulse energies. Despite experimental and numerical studies, there is no analytic theory to date. We present a semi-analytic theory based on the variational approach and a novel trial function.
Next generation light sources demand femtosecond-level synchronization of its subcomponents over distances of several km. We demonstrate an optical synchronization system based on distribution of mode-locked pulses over optical fiber in a real accelerator environment.
We demonstrate an octave-spanning, self-referenced optical frequency comb produced with a high repetition rate (frep=575 MHz) femtosecond Ti:sapphire laser that requires less that 1 W of 532 nm pump power.
We report on the generation of a wideband supercontinuum in a microstructured fiber with a very weak nonlinearity. This type of fiber allows for producing broadband sources with higher spectral density than with narrow-core fibers.
Spectral shaping in a fiber amplifier with finite gain bandwidth (DeltalambdaFWHM~15nm) and strong self-phase-modulation (PhiNL~12pi) is studied numerically and experimentally. Pulses amplified to 30 muJ energy are dechirped to 250 fs duration.
A flexible image guide is excited by femtoseconde pulses. Precompensation of dispersion and nonlinear effects encountered in the waveguide allows the recording of two photon fluorescence endoscopic images of colon cells.
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