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The design ideas of thin disk lasers will be explained in detail. Experimental results for continuous wave operation and for pulsed operation show the capability for building high power lasers with high efficiency and good beam quality, simultaneously. Modelling the thin disk laser behaviour shows the possible power and energy scalability.
We report on the first demonstration of the locking of a 28000 finesse cavity in picosecond regime. Besides, we have unambiguously measured the CEP drift of 2 ps pulses and characterized its effect on cavity locking.
Thermally induced distortions in Nd:glass rods 4.5cm in diameter have been measured and compensated by phase conjugate mirror and linear optics technique. Thermal loads in the rods are by factor 5 below thermal fraction limit.
In this work, emission cross-section dependence on temperature was observed experimentally in passively Q-switched Nd:YVO4/Cr4+:YAG laser. Heating the gain element from 30 °C to 70 °C, the Q-switch pulse energy at 100 Hz QCW pump was increased by three times from 60 μJ to 190 μJ and pulse duration was reduced by 30% from 2.5 ns to 1.8 ns, with peak power from 24 kW to 105 kW. With addition of heat...
We report a metamorphic GaSb-based laterally coupled distributed-feedback laser grown on a GaAs substrate that operates continuous wave at room temperature with a total output power of 40 mW.
We detect both pulsed and CW IR light using uncooled GaN or GaAs photodiodes using extremely-nondegenerate two-photon-absorption (2PA) which shows large enhancement over degenerate 2PA. Urbach-tail absorption limits the signal-to-noise ratio for CW detection.
We report on a 200W, 2mJ, 25ns MOPA fiber laser, the last stage of which has a hybrid gain fiber composed of large-core-diameter and small-core diameter Yb doped fibers.
We explore experimentally a new regime of operation for mode locking in a Ti:Sapphire laser with enhanced Kerr nonlinearity, where the threshold for pulsed operation is lowered below the threshold for continuous-wave operation.
We present an Yb:YAG modelocked thin-disk laser with a record-high average output power of 275 W, a pulse duration of 583 fs and a pulse energy of 16.9 μJ. Furthermore, we present first experiments towards higher pulse energies.
We report on controllable fabrication of metallic microstructures by direct laser writing in aqueous solution of metal ion. Various planar nanostructures including metamaterials were demonstrated with subwavelength resolution and high fabrication efficiency.
We will report on our effort to scale the pulse energy and peak power from ultrashort pulse Tm doped fiber laser systems, with >1 μJ pulse energy within 300 fs duration after compression.
We report on recent progress in development of new gain media for tunable (3–8 μm) mid-IR lasers as well as Fe:ZnS/Se lasers operating in CW (>1.5W), gain-switched (>1 mJ@7ns@lkHz) and long-pulse (>0.5 J@20μs) regimes.
We utilize thulium doped PCF rods for amplification of ns-pulses in MOPA configuration and achieve MW-level peak powers with sub 10 ns pulses at 2 μm. The utilization of end caps will enable multi MW peak powers.
We present a single-mode, monolithic holmium-doped silica fibre laser resonantly pumped by thulium-doped fibre lasers through a fused fibre pump combiner. We report the highest achieved output power for a holmium laser of 407 W.
We present results from a mid-IR ZGP ring OPO that demonstrates further power scaling of a cascaded mid-IR laser system. The system achieved 30.2 W of mid-IR output with excellent beam quality of M2 = 1.3.
A linearly polarized Q-switching large-mode-area photonic crystal fiber laser at 978 nm is demonstrated. Short pulse of 14 ns duration is achieved with 36 dB polarization extinction ratio at 10 kHz repetition rate and 2 W output power.
We report a Nd3+-doped double-clad fiber laser with a record output power of 20 W at 910nm. A laser conversion efficiency as high as 44% was achieved in CW operating mode.
The Photoluminescence spectra and lifetime of Fe2+ doped ZnSe crystal with quantum cascade laser pumping is measured. At room temperature the photoluminescence lifetime is ∼ 0.38 μs, which increases to ∼ 100 μs at 80K.
AWE is tasked with supporting Continuous At Sea Deterrence (CASD) by certifying the performance and safety of the deterrent in the Comprehensive Test Ban Treaty (CTBT) era. Certification must be achieved by supplementing historical nuclear test data with use of computer calculations. AWE therefore regularly procures, installs and operates large supercomputers, and complements this with high end storage,...
Efficient second harmonic conversion of a passively Q-switched microchip laser, obtaining 1.9 MW peak power, 740μJ, 400 ps pulses at 500 Hz, with > 60% SHG conversion efficiency, without using focusing optics, is reported.
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