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Recent development of thin-disk multipass amplifiers has resulted in several breakthroughs in average power and pulse energy of both ps- and fs-amplifiers [1-3]. These results confirm the suitability of this laser architecture for amplification of ultrafast pulses with high energy and at high average powers thanks to low nonlinearities in the thin-disk and to an efficient cooling scheme. However,...
Pulsed operation characteristics of a high-power 1550 nm tapered distributed Bragg Reflector (DBR) laser diode are described. The development targets applications such as LIDAR and range finding, which require eye-safe, coherent light sources with a high peak-power. In particular, we employ a regrowth-free technique and AlGaInAs/InP gain structure, and demonstrate a peak power of about 1.6 W (drive-current...
Mid-infrared (MIR) frequency comb sources enable high-speed and accurate detection of various species, since many molecules possess their fingerprints in this wavelength range. Usually, broadband radiation in this spectral region is obtained from optical parametric oscillators (OPOs), which provide high output power and broad tuning capabilities [1]. However, OpO sources require locking of the cavity...
We report the successfully demonstration of a wavelength tunable passive Q-switched Alexandrite laser with semiconductor saturable absorber mirror (SESAM) and using a red diode (AlGaInP) pump laser at 635 nm. This system allows the potential for low-cost, compact wavelength-tunable short pulse sources, compared to active Q-switch pulsing methods [1, 2].
Q-switched lasers operating in the nominally eye-safe 2 μm wavelength region are important for applications such as material processing, medicine, LIDAR systems, and pumping of optical parametric oscillators based on ZnGeP2 or periodically poled GaAs. Many of these benefit from wavelengths above 2.05 μm, which are not accessible by the actually widely used Tm-lasers. The long upper laser level lifetime...
Graphitic carbon nitride (g-CN) based materials have been regarded as a novel class of multifunctional nanoplatforms for electronic, catalytic and energy applications. However, its optical characteristics have not received enough attention, yet. Although the theoretical bandgap of g-CN is quite large, which seriously limits the optical response range, various efficient strategies have been proposed...
High-power mid-IR lasers at 3 μm wavelength have many potential applications in medical and industrial fields because of the strong absorption by water at that wavelength region. Recently, erbium-doped cubic rare-earth sesquioxide crystals (e.g. Lu2O3, Y2O3, and Sc2O3) are gaining attention as laser sources due to their lower phonon energies and higher thermal conductivities compared with YAG. In...
Fibre amplifiers in MOPA configuration are promising candidates to address the requirements of laser sources for the next generation of gravitational wave detectors (GWDs) operating at 1.0 and 1.5 μm [1]. However, the development of ASE- and SBS-free systems with significant output power in the linearly polarized TEM00 mode is quite challenging, in particular if a compact monolithic design is required.
Quantum cascade lasers (QCLs) are powerful sources of coherent radiation covering the frequency range from mid-infrared to terahertz. In the terahertz frequency range the active region is normally realized using a GaAs/AlxGa1−xAs semiconductor heterostructure. This material system enables a variable conduction band offset by changing the Al-content in the barrier layers without introducing a significant...
Tunable mid-infrared semiconductor light sources are of particular interest for molecular spectroscopy; for example, CO2 and other atmospheric gases have strong absorption lines in this wavelength range. Currently, to detect multiple gases simultaneously one needs several continuous-wave (CW) operated mid-infrared laser diodes (LDs) with wide tuning range. For a miniaturized gas sensing system, a...
We report on the best linewidth for a cw OPO locked with the side-of-the-fringe technique. The robustness of the OPO combined to 1 W output power is relevant for applications to quantum light-matter interfaces.
Directional mid-lR (3–20μm) light sources are required for remote sensing spectroscopic applications in various fields such as medicine, environment and defense & security. Mid-IR supercontinuum (SC) sources are one of the most promising solution since they offer both wide spectral coverage and high spectral power density along with a good beam quality. For practical purposes, fiber-based sources...
Titanium doped sapphire (Ti:Al2O3) is a gain medium used in rod-type lasers with a very broad emission bandwidth exceeding 200 nm (FWHM) allowing the generation and amplification of very short pulses (<100 fs). On the other hand the thin-disk type lasers have proven to offer both power and energy scaling to a wide extent [1-3]. In this talk we present results on power scaling of a Ti:sapphire thin-disk...
Atomic vapours are a versatile tool for studying a wide range of nonlinear phenomena. In particular, quasi-resonant atomic systems allow processes such as electromagnetically induced transparency, fast and slow light, lasing without inversion and four wave mixing (FWM) to be studied at low light intensities. The resonant enhancement of FWM in a rubidium vapour is such that it can be used for efficient...
Superfluorescent fiber sources (SFS) find wide application in many areas of science and technology: in fiber-optic gyroscopes, ophthalmology, optical time-domain reflectometry, optical telecommunications and devices that need a signal with low temporal and high spatial coherence [1]. There is interest in development of new fiber sources operating in spectral IR regions, where rear-earth-doped fibers...
The advantages of radially and azimuthally polarized laser beams for various applications in materi processing, e.g. cutting and drilling, over circularly or linearly polarized beams has been reported amoi others in [1]. Furthermore, for micro material processing ultrafast lasers with pulse durations in the ord of 1 ps have gained tremendous interest. The oscillator we present here is a promising...
Transverse modal instability (TMl) [1] is proving to be a major power-scaling limitation in high-power fibre lasers (HPFLs) [2]. The origin of TMI is predominantly thermal and a number of theoretical models have been introduced to explore its characteristics [3-9]. The majority of TMI reports so far deal with fibre amplifiers in MOPA configurations [3-14], and only a small numbers of recent reports...
Fiber based cw laser systems nowadays reach output powers of several kW and often limited by nonlinear effects such as Stimulated Raman Scattering (SRS) [1]. Previously, the influence of the grating spectral width of fiber oscillators on SRS has been investigated [2]. Here we go one step further and compare different seed laser systems that are amplified to a kW level in a single fiber amplifier with...
We report the highest power narrow spectrum 1180 nm distributed Bragg reflector (DBR) laser diodes prepared using GaInNAs quantum wells as a gain material. In particular, we demonstrate a CW output power up to 560 mW from Ridge Waveguide (RWG)-DBR laser diodes and up to 2.75W for Tapered DBR-LDs. The demonstration targets applications in second harmonic generation (SHG) for generating high brightness...
In this contribution, we report on development of a high-repetition-rate, kW-level picosecond Yb:YAG thin-disk laser system PERLA C [1]. Its design utilizes the CPA (Chirped Pulse Amplification) technique, comprising a low-energy Yb-fiber oscillator and preamplifiers, two thin-disk regenerative amplifiers and a chirped volume Bragg grating (CVBG) for both pulse stretcher and compressor. The target...
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