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Dual-comb spectroscopy using electro-optic-modulator-based frequency combs broadened in a highly nonlinear fiber opens up new opportunities for analytical spectroscopy. One hundred thousand spectra per second are measurable with a 10-THz span and a 157-GHz resolution.
We convert higher order fiber modes into Gaussian beams using binary phase plates, and characterize the resulting M2 and coupling efficiency to single-mode fiber (∼64%). Reciprocally, the system is used to excite modes in multi-mode fiber with purity >13dB.
An analytical step-size selection rule is proposed for the simulation of polarization multiplexed signal propagation through the single mode optical fiber. The method leads to approximately constant one step simulation error and high computational efficiency.
Picosecond optical pulses are characterized by directly photodetecting, with low resolution, 64 ancillary pulses with different chromatic dispersions generated in an all-fiber, high-sensitivity diagnostic, with application to the single-shot characterization of high-energy lasers.
A ∼1000 THz wide and 150 nJ/nm energy spectral-density supercontinuum, and a Raman comb wider than 300 THz are generated in atmospheric air-confined in inhibited coupling Kagome fibers for the first time.
Multiheterodyne frequency comb spectroscopy without mode-locked lasers is reported in the near-infrared C and L telecommunication bands. The system without active stabilization combines high signal-to-noise ratio, rapid tuning and moderate multiplex spectral span.
We analyze defect-induced mode coupling in a hollow-core photonic bandgap fiber using time-of-flight, and show its utility in complementing optical time-domain reflectometry.
We report a blue-enhanced supercontinuum generation pumped by a giant-chirped SESAM mode-locked ytterbium-doped fiber laser. An extremely wide optical spectrum spanning from 380 nm to 2400 nm with total power of 3 W is obtained.
Graded index porous fiber incorporating an air-hole array featuring variable air-hole diameters and inter-hole separations is proposed. We experimentally demonstrate smaller pulse distortion, larger bandwidth and higher excitation efficiency compared to fibers with uniform porosity.
We experimentally and theoretically describe formation of random fiber laser's optical spectrum. We propose a new concept of active cycled wave kinetics from which we derive first ever nonlinear kinetic theory describing laser spectrum.
Based on a birefringence tellurite microstructured optical fiber, multiple solitons are generated by tuning the pump power and the polarization orientation. The central wavelength of the first soliton can be tuned over about 680 nm.
We make first direct observation of breathing bound solitons in mode-locked laser. We measure pulse-to-pulse spectrum evolution and reveal internal interactions between bound solitons in real-time.
By employing hollow-core fiber compression using a stretched flexible fiber, we achieved 2-cycles pulses centered on 1.8μm with more than 5mJ energy per pulse.
We show that the sensitivity-bandwidth product of the aLIGO gravitational wave detector can be enhanced by a factor of 18, while remaining below the standard quantum limit, by employing a white light cavity configuration.
A method incorporating controllable mode interaction is proposed for Kerr frequency comb generation in normal-dispersion microresonators. Repetition-rate-tunable combs and broadband mode-locking transitions are demonstrated by using dual silicon nitride microrings.
We report the broadband supercontinuum (SC) generation in a tapered seven-core photonic crystal fiber (PCF). The introducing of a section of taper waist dramatically alters the group velocity and making the SC flatter.
We propose and demonstrate a novel design of simple and compact tunable fiber laser skillfully using chromatic aberration of a lens relay and a slit-like effect of optical fiber core.
We demonstrate a compact 290 fs, 0.5 mJ laser source at 2-μm wavelength generated from mJ-level 3.4-ps pulses from a fiber laser seeded Ho:YLF regenerative amplifier system via pulse compression in a gas-filled Kagome type HC-PCF.
An ultrafast all-optical simultaneous wavelength and mode conversion scheme is purposed based on intermodal nonlinear wave mixing, with the capability of switching state of polarization and mode degeneracy orientation in few-mode fibers with high efficiency.
We experimentally observe the spectral dynamics of a passively mode-locked fiber laser by using a parametric spectro-temporal analyzer (PASTA) with a frame rate up to 100 MHz, and different non-repeating transient dynamics has been observed.
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