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We demonstrate a single-comb Fourier transform spectrometer by sweeping the pulse repetition frequency of an electro-optic frequency comb. Such combs are more flexible than mode-locked lasers in terms of tunability of the comb repetition rate, which provides an advantage for comb based spectroscopy.
We demonstrate a multi-wavelength Brillouin Tm3+-doped fiber laser at 1873 nm in a linear cavity. Five order Brillouin wavelengths with channel spacing of ∼0.1 nm are obtained.
We present an all-fiber Raman laser based on a mid-infrared compatible and highly nonlinear As38Se62 core/As38S62 cladding chalcogenide microwire. The laser operates at a wavelength of 2.025 μm with a low threshold peak power of 4.6 W. Pulse width can be compressed to the femtosecond scale.
We demonstrate all-fiber and widely tunable mid-infrared wavelength converters using As2Se3 microwires cladded with fluorine-based Cyclic Transparent Optical Polymer. Normal dispersion parametric processes are utilized to achieve far-detuned wavelength conversion of 49.3 THz, representing the largest frequency shift reported in soft glass materials.
We demonstrate simultaneous generating multiple microwave waveforms based on optical spectral shaping and wavelength-to-time mapping (WTM) technique. The spectral shaper is based on an arrayed waveguide Sagnac interferometer incorporating linearly chirped fiber Bragg gratings.
We demonstrate linear and nonlinear optical transmission results of a highly nonlinear As2Se3 optical microwire cladded with perfluorinated CYTOP. This polymer enables the operation of the microwire in mid-infrared wavelengths up to >2.5 μm.
We report a chalcogenide microwire-based optical parametric oscillator (OPO). The all fiber OPO is tunable in the wavelength band of 2 μm, with a threshold peak power of 5 W and slope efficiency of 2%.
We demonstrate an optical comb source made out of 500 in-phase and ultra-narrow spectral lines spanning over 32 nm. The source results from a single mode Brillouin laser processed with phase modulation, pulse compression, four wave mixing and regeneration. The narrow linewidth of the Brillouin laser was replicated throughout the frequency comb spectral lines.
We demonstrate for the first time a graphene-based passively Q-switched Tm3+:ZBLAN all-fiber laser at 1480 nm. Pulses with a duration of ∼ 9 µs, repetition rate of 29.9 kHz, and energy up to 447.16 nJ are obtained.
We demonstrate an optical fiber Brillouin laser operating over several stokes orders. Experimental results agree well with theoretical modelling. The spectrum shows up to six stable Stokes Brillouin orders within 10 dB below of the pump peak power.
We report the first demonstration of mid-infrared supercontinuum generation in As2Se3 chalcogenide microwires with the added advantage of using low energy pulses. The generated supercontinuum covers two octaves bandwidth from 1.1um to 4.4um.
We investigate the performance of selected polymers as coatings to chalcogenide microwires. The design principle, fabrication method, and characterization results of polymer-coated chalcogenide microwires are provided.
We report the first chalcogenide microwire that is designed with all-normal dispersion to generate supercontinuum by optical-wave-breaking, a low-noise nonlinear process. The generated supercontinuum spectrum spans over an octave from 960 nm to 2500 nm using a microwire length of only 3 mm.
Abstract-We investigate the fluorescence spectra of a ZBLAN fiber as a function of the laser pumping source wavelength, 790 nm and 980 nm, with an aim to optimize the fluorescence at 2.7 μm. A theoretical model based on the energy band diagrams of erbium has been built to support the results.
This work presents first experimental measurements of cascaded stimulated Raman scattering emission from high-Q As2s3 microspheres in the mid-IR region of 2 μm. The pumping setup used is self-frequency locked on the microsphere resonances. Using a pump signal in the 1880 nm band of thulium, high order stimulated Raman emission up to the 3rd order and reaching a band centered at 2355 nm has been observed.
We demonstrate parametric frequency conversion with large frequency shift up to 30 THz and super continuum generation in the mid-infrared by pumping polymer-coated chalcogenide optical microfibers with a femto second optical parametric oscillator.
In the context of fiber laser sources, highly nonlinear gain media have become an alternative to rare-earth doped glasses. This talk will focus on the recent progresses made with this technology as practical gain medium.
Cascaded stimulated Raman scattering emission is reported in high-Q As2S3 microspheres for the first time. Stimulated Raman scattering emission is observed up to the 5th order with a pump power of 500 μW at 1550 nm.
We present a chalcogenide microwire device that acts as a compact (∼11 cm length, ∼1 µm diameter) and power efficient (sub-Watt threshold peak power, >2% slope efficiency) Raman-parametric laser, wavelength converter and ultra-broadband supercontinuum generator/amplifier.
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