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Two-micron lasers are of great interest in a range of applications, from spectroscopy and free space communications, to polymer machining and laser surgery. They also provide an important stepping-stone for wavelength generation further into the mid-infrared via nonlinear frequency conversion. Holmium doped fibre laser systems offer particularly attractive properties as they allow access to the atmospheric...
We present a suite of silica-based thulium-doped fiber amplifiers (TDFAs) operating across the 1650–2050nm waveband. High gain and low NF are achieved by combining several TDFA designs optimized for short, central and long wavelength operation.
We report the realization of a wideband holmium doped fiber amplifier designed for optical communications over 2050 – 2130 nm, providing up to 28 dB small signal gain and 4 – 9.5 dB noise figure.
We report the first demonstration of silica-based thulium-doped fiber amplifier (TDFA) working in the 1.65 – 1.7 µm waveband. Up to 29 dB small signal gain and noise figure as low as 6.5dB are achieved.
We report the first demonstration of in-band diode-pumped silica-based thulium-doped fiber amplifiers working in the 1.7–1.8 μm waveband. Compared to previously reported results, 90 nm gain extension has been achieved by exploiting novel amplifier designs.
Suppression of detrimental modal interference effects within a cladding-pumped multimode thulium fiber amplifier is achieved using variable bandwidth seed source. The amplifier produced pulse energies of 1.1mJ and peak powers over 20kW at 1956nm.
A simple technique for directly generating a radially-polarized output beam from an ytterbium-doped fiber laser using an intracavity S-waveplate is reported. The laser yielded 7W of output with a corresponding slope efficiency of 67%.
We present a 2-mode group, switchable spatial mode erbium doped fiber laser incorporating a spatial light modulator. The laser wavelength can be tuned using an intra-cavity wavelength selective filter and provides >10dB extinction ratio between LP01/LP11 modes.
The short wavelength limit of a thulium fiber laser is investigated. Wavelength tuning from 1720nm to 1660nm was demonstrated and fixed wavelength operation up to 12.6W at 1726nm with slope efficiency of 67% was achieved.
Wavelength-swept operation of cladding-pumped and core-pumped thulium-doped fiber lasers using a novel intracavity rotating disk wavelength-scanning arrangement is reported. Scanning ranges from 1905–2049nm (for cladding pumping) and 1768–1956nm (for core pumping) were obtained.
The first higher order Laguerre-Gaussian (LG01) beam is characterised by a donut-shaped intensity profile and has a phase front that advances with a helical trajectory described by exp(±iφ-ikz), where φ is the azimuthal angle and z is the axial position. As a consequence, the LG01 beam has an orbital angular momentum of ±ħ for each photon. These unique properties of LG01 beams have attracted growing...
Wavelength-swept laser sources with broad wavelength tunability and narrow instantaneous linewidth in the two-micron band have potential applications in a number of areas, including spectroscopic characterisation and optical coherence tomography (OCT). The use of OCT for non-invasive investigation of paintings to provide the information necessary for effective restoration and to aid conservation is...
Sources that offer both high peak power and wavelength flexibility within the two-micron wavelength band are of interest for a number of applications, including spectroscopic characterisation, laser processing of transparent polymers and laser surgery. They also provide a platform for nonlinear frequency conversion to the mid-infrared wavelength band. In this paper, we present a high-peak-power pulsed...
We present the first in-band diode-pumped TDFAs operating in the 2 μm wavelength region and test their application as high performance amplifiers in potential future telecommunication networks. We demonstrate amplification over a 240 nm wide window in the range 1810–2050 nm with up to 36 dB gain and noise figure as low as 4.5 dB.
We report the realization of a thulium doped fiber amplifier designed for optical communications providing high gain (>35dB) and low noise figure (<;6dB) over 1910nm-2020nm with a maximum saturated output power of more than 1W.
A simple technique for directly generating pseudo-radially-polarized or pseudo azimuthally-polarized donut-shaped beams in a diode-pumped solid-state laser is presented. Preliminary results for a Nd:YAG laser are described and the further potential of this technique is considered.
A novel method for selectively exciting a single-spatial-mode (fundamental or higher-order) in a high-power multi-mode fiber laser resonator is presented. Preliminary results for a cladding-pumped Tm-doped silica fiber laser are discussed.
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