The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Two coherent 1.5 μm frequency combs are transferred to 3.4 μm by difference-frequency generation with a 1064 nm cw laser. From a multi-heterodyne measurement, the residual linewidth between the comb teeth is resolution-limited at 200 mHz. Work of the U.S. government, not subject to copyright.
We present a continuous-variable QKD system using heterodyne detection. We experimentally determine channel characteristics and compare them to bounds of our entanglement criterion. For the first time, the local oscillator is considered in this verification.
We present a mid-infrared frequency comb generated via differency frequency mixing of a Yb femtosecond fiber laser. After passing through a methane gas sample, the MIR comb is upconverted and dispersed onto a CCD for detection.
A nanoscale hole placed centrally in the core of a PCF breaks the degeneracy between radially and azimuthally polarized modes, causing a large splitting in phase velocity, group velocity and dispersion.
A linearly polarized fiber laser emitting at 979 nm with an output power of 2 W is presented. By using a photodarkening-resistant Yb/Ce/Al-codoped silica fiber, degradation-free operation is achieved over several hours.
We report on the generation of high-energy femtosecond pulses from an ytterbium-doped photonic crystal fiber oscillator. Sub-150 fs pulses are obtained at low-cavity dispersion. By increasing the normal cavity dispersion, pulse energy exceeds 100 nJ.
We report a mode-locked Thulium fiber oscillator that generates 4.8-nJ pulses at center wavelength of 1935nm with duration of 235fs. The anomalous dispersion in the cavity is compensated with the insertion of Er-doped fiber.
We exploit stimulated-Raman-scattering to generate polarisation-vortices over 3-Stokes-shifts (40-THz) with a specially-designed optical fiber. This illustrates the possibility of generating these beams, of immense recent interest, at any wavelength that nonlinear processes in glass allow.
We demonstrate amplification of femtosecond pulses in large mode area singlemode Yb-doped photonic bandgap Bragg fibers. 260 fs 5 µJ pulses are obtained at 100 kHz repetition rate (1 W of average power).
We demonstrated novel all-optical signal regeneration using pulse trapping. Amplification, re-timing, and pulse shaping were demonstrated in only a 140 m-long standard low birefringent fiber. A large gain of 20 dB was observed.
The noise limits of phase-preserving NOLM-based regenerators from Rayleigh backscattering and possible improvements are investigated. Applying optimizations a four fold increase in the number of cascaded regenerators was achieved for a DPSK transmission system.
We proposed a hybrid fiber Raman/parametric amplifier which can have significant gain enhancement over that of a Raman-assisted fiber optical parametric amplifier using the same length of fiber, Raman and parametric pump powers.
We present a subpicosecond, 200 GHz-repetition rate, passively mode-locked laser based on high-harmonic four-wave mixing in an integrated CMOS-compatible high-Q nonlinear ring resonator.
We report picosecond fiber MOPA pumped supercontinuum source with 39W output, spanning at least 0.4–1.75µm with high and relatively uniform spectral power density of ∼31.7mW/nm corresponding to peak power density of ∼12.5W/nm in 20ps pulse.
A narrow linewidth thulium fiber laser is tuned from 1945 – 2090 nm to investigate atmospheric transmission at 1 km. Results confirm simulations with high transmission >2025 nm and strong atmospheric absorption <1960 nm.
A novel planar two-stage adiabatic single-mode fiber-to-chip coupler design is presented. The combination of rib and inverse tapers allows to make it 2–2.5 times shorter than state-of-the art inverse taper-based couplers with similar conversion efficiency.
We demonstrate that microstructures inside the cladding of phosphate fiber as well as sub-wavelength nanostructures inside the fiber core can introduce birefringence in phosphate glass fiber components.
We demonstrate a resonant cavity approach to enhance narrow band THz radiation. Two nanosecond laser pulses in a cavity interact with a nonlinear crystal to produce 7-fold enhancement of THz power compared to single-pass orientation.
An all-fiber optical Faraday mirror is demonstrated. It consists of a fiber Faraday rotator (56-wt% terbium-doped fiber) and a fiber Bragg grating. The polarization state of the reflected light is rotated 89°±2°.
We have achieved a peak power of 1.2 kW for 105 ns pulses with transform-limited linewidth by using a SM 25 µm core phosphate fiber in the power amplifier stage of a monolithic MOPA system.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.