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Laser emission into modes of a dielectric microsphere was observed from optically pumped HgTe quantum dots on its surface. Including real-time measurement of the input pump losses reveals nanowatt threshold levels for these lasers.
We report a high power diode-pumped mid-IR fiber amplifier at 2.7 mum. 4.6 W amplified signal was obtained for an input signal of 110 mW, corresponding to a net gain of 16.2 dB.
Using an accurate full-vectorial finite element method, a realistic model of a fabricated dispersion compensating photonic crystal fiber is analyzed. An almost flat Raman-gain spectrum (gain-ripples at just plusmn0.48-dB) is obtained using a single pump.
We have demonstrated a picosecond cryogenically-cooled Yb:YAG regenerative amplifier with diode pumping. A high pulse energy of 3.4 mJ was obtained with a 12.5-ps pulse duration at 500-Hz repetition rate.
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.
Diffraction-limited nanosecond pulse generation with MW-peak powers and multi-mJ-energies has been explored using 80-mum core Yb-doped fibers, demonstrating 1-MW peak power pulses with 85-W of average power at 100-kHz and 1.56-MW peak at 50-Hz.
We report the experimental demonstration of a novel distributed fiber-optic strain sensor by localizing a dynamic grating in polarization maintaining erbium-doped fiber (PM-EDF) using the technique of synthesis of optical coherence function (SOCF).
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.
We show analytically and numerically that parabolic pulses and similaritons are not always synonyms and that a self-phase modulation amplification regime precedes the self-similar evolution. Properties of the recompressed pulses after SPM amplification are investigated.
Performance of tunable buffers based on optical amplifiers and its improvement using gain flattening is analyzed. A simple analytical expression indicates that to store more than a couple of bits unrealistically high gain is required.
We describe a beam cleanup setup to convert a multimode beam into a singlemode beam by stimulated-Brillouin-scattering in a multimode gradient-index fiber. A M2=6.5 beam is converted into a M2=1.3 beam with 31% efficiency.
We report optical amplification in a bismuth-doped silica fiber at 1308 nm with 810 nm excitation and demonstrated simultaneous optical amplification at two wavelengths near 1300 nm region. This wavelength is the closest to the important telecommunications window.
We describe a 1080-nm diode master oscillator utilizing a fiber Fabry-Perot tunable filter with subsequent fiber amplification to 9 W output power. 25 MHz linewidth and 5 THz tuning in less than 1 ms were achieved.
We report on an ytterbium-doped rod-type 0.5-m long photonic crystal fiber (PCF) laser emitting 320-W in a fundamental mode from a 60-mum core. Furthermore, single-transverse-mode propagation in a passive photonic crystal 100-mum-core fiber is investigated.
We report coherent combining of a record thirty-two PM fibers. Strehl degrades by <1 dB and phase error is <lambda/50. The use of a 2D fiberarray as the beamformer makes this approach scalable to >1000 fibers.
We report on the development of all-fiber devices based on a hermetically sealed hollow-core-PCF filled with acetylene at sub-millibar pressure and designed for the generation of electromagnetically-induced transparency and for saturable absorption.
We propose the use the recently discovered effect of spectral self-phase conjugation in SBS for coherent beam combining of the output from an array of high power fiber amplifiers.
4.6 ps pulses at 910 MHz produced by a passively mode-locked VECSEL were amplified by ytterbium doped fiber amplifiers to average powers greater than 200 W and subsequently compressed to 430 fs duration.
Near infrared emission with a bandwidth more than 450 nm which should be useful for ultra broadband optical amplifiers and tunable lasers for optical telecommunication, has been observed from Bi-doped lithium alumino silicate glass.
We report ultrafast amplification of mode-locked laser pulses down to a width of 710 fs at 20 and 80 GHz with a semiconductor optical amplifier, both devices based on the same quantum dot material.
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