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Supercontinuum generation in the mid-infrared (mid-IR) spectrum has a broad array of potential applications in medicine, environmental sensing, and defense. Mid-IR sources play a crucial role in defending aircraft against missile attacks [1]. It is desirable to have a source that acts like a mid-IR “light bulb” to produce a broadband, flat, and incoherent spectrum. In work to date, we have demonstrated...
We develop a reduced model using 100 single-shot simulations for the output spectrum from a supercontinuum source using an As2S3 photonic crystal fiber that qualitatively matches the ensemble averaged spectrum expected in an experiment.
At NRL, we are involved in the research and development of specialty infrared optical fibers, glasses, ceramics, and thin films. We have state-of-the-art facilities for making high purity chemicals and unique optical materials of high quality, which are being exploited in optical devices and systems for Navy and DoD applications. One of the core scientific areas that we have pioneered is based primarily...
An octave spanning spectrum is generated in an As2S3 taper via 77 pJ pulses from an ultrafast fiber laser. Chirp compensation allows the octave to be generated directly from the un-amplified laser output.
An octave spanning spectrum is generated in an As2S3 taper via 77 pJ pulses from an ultrafast fiber laser. Chirp compensation allows the octave to be generated directly from the un-amplified laser output.
We simulate supercontinuum generation in an As2S3 chalcogenide photonic crystal fiber with a hexagonal structure, optimizing the fiber pitch and pulse duration with a 2.8 μm laser source in order to maximize the output bandwidth.
We demonstrate broadband low power supercontinuum generation in arsenic sulphide (As2S3) tapered fiber nanowires with an effective area ~0.8 μm2 and nonlinearity γ = 12,400 W-1 km-1. Simulations showed good agreement between theory and experiment.
The output power at 4600 nm in a Dy:chalcogenide glass fiber laser is found through numerical simulations to be significantly enhanced with simultaneous lasing at 3300 nm.
High nonlinearity and large IR transparency make chalcogenide fibers well suited for compact Raman amplifiers, supercontinuum generation and other mid-IR sources. As2S3 fiber has record high theoretical gain compared with silica fiber for slow-light applications.
The output power at 4600 nm in a Dy:chalcogenide glass fiber laser is found through numerical simulations to be significantly enhanced with simultaneous lasing at 3300 nm.
We show the Raman response function and dispersion curve for a chalcogenide fiber. We then model and reproduce the experimental bandwidth of IR supercontinuum generation using a chalcogenide PCF.
The Ising lattice gas, with its well known equilibrium properties, displays a number of surprising phenomena when driven into nonequilibrium steady states. We study such a model with anisotropic interparticle interactions (J||≠J⊥), using both Monte Carlo simulations and high temperature series techniques. Under saturation drive, the shift in the transition temperature can be both positive and negative,...
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