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We realized a wavelength-tunable mode-locked fiber laser using intracavity dispersion. Continuous tuning over 100 nm was obtained at a sweep rate of 20 kHz. Discrete tuning was achieved over 39 nm by inserting a FFPI into the cavity.
We report on the quality of ultrashort pulses that are generated by a chirped pulse fiber amplification system when different pulse shapes are amplified. We focus thereby on sech2, parabolic and experimental parabolic pulse shapes.
A light source using sum-frequency generation is developed for the ytterbium clock transition at 578 nm. Doppler-free spectroscopy of iodine lines near the Yb clock transition and frequency stabilization are demonstrated with the light source.
Watts-level, continuous-wave pumped supercontinua, 1.06-1.7 mum, generated in a new low OH-loss PCF exhibit distinct spectral and noise dynamics when pumped with either high or low-intensity-noise 1 um sources. Applications to ultra-low-noise mum-scale OCT are analyzed.
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.
We demonstrate the use of a prism-grating sequence to reduce third-order dispersion inside a modelocked Yb fiber laser. 33-fs pulses, the shortest from a fiber oscillator, can be generated with extremely clean profiles.
23 W, single-mode linearly-polarized 0.4 nm linewidth CW generation is achieved in a polarization-maintaining fiber Raman cavity pumped by a linearly-polarized Ytterbium fiber laser and applied to 3 W 589 nm second harmonic generation in MgO-PPLN.
We report on efficient nonlinear frequency doubling of broadband near-infrared pulses from a femtosecond fiber laser into narrowband visible radiation tunable from green to red with average power levels up to 9.5 mW.
A picosecond single-mode, linearly polarized fiber source producing 176 W of average power was employed to generate up to 80 W average power at 530 nm by frequency doubling through a single LBO crystal.
A distorting optical object is illuminated with a wavelength-swept fiber laser to investigate how changes in wavelength affect image quality degraded by speckle/interference noise. An experimental result showing excellent reduction of speckle/interference is presented.
We report passive harmonic-mode-locking of an Yb-fiber laser at repetition rates continuously scalable to 1.5 GHz. This laser demonstrates an unprecedented combination of high repetition rate, high pulse energy and excellent pulse quality.
Self mode-locked Ytterbium-doped fiber (YDF) ring-laser is presented that consisted of all polarization-maintaining (PM) fiber system, especially single-mode PM-YDF with side-hole type. Environmentally stable pulses and a wide tuning range of 60 nm were obtained.
We demonstrate a resonant semiconductor saturable absorber used in transmission for mode-locking of fiber lasers. The cavity-enhanced modulation depth corresponding to low-loss transmission state enables a robust self-starting mode-locking highly tolerant to cavity dispersion.
Coupling two frequency-conjugate laser pulses into an optical fiber, we observe at the middle frequency either enhanced photon generation via four-wave mixing or suppressed Raman emission depending on the phase difference between the two pumps.
We demonstrate a remote fiber sensing system with broadband sub-picostrain resolution. Its performance is enhanced by optimization of the fiber resonator design, such that its sensitivity is limited only by the pre-stabilzed laser frequency noise.
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