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It was shown that the spectral width of a nominally continuous wave Raman fiber laser (RFL) output becomes narrower after propagation in normal dispersion (β2>0) fiber [1]. This feature, attributed to Inverse Four-Wave Mixing (IFWM), was especially pronounced when the RFL output had a double-peak spectral shape caused by efficient FWM inside the cavity [2]. This spectrum was transformed into a...
We present a numerical study of the nonlinear dynamics of a population of coupled semiconductor lasers with saturable absorber operating in the excitable regime [1] and described by a set of coupled Yamada models [2]. In particular we have investigated the self-organized synchronization process taking place spontaneously among the lasers, showing significant correlations between the spike-like pulses...
Mid-infrared coherent sources at 3–4 μm have a wide variety of applications that include, but are not limited to gas sensing, material processing and production control. The MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal is a well-known nonlinear element for quasi-phase-matched optical parametric oscillators (OPOs) typically pumped by 1-μm laser radiation [1]. However, strong multi-phonon...
Stimulated Raman scattering presents one of important trends in nonlinear optics enabling to generate Stokes-shifted radiation at frequencies that are not readily available from solid state lasers. This method is suitable also because the phase matching fulfilment isn't required. To get stable and efficient Raman generation of picosecond and even femtosecond ultra-short Stokes pulses, the method of...
Satellite-based laser-based remote sensing (lidar) of the atmosphere can be used for meteorology, atmospheric chemistry and climate change but requires high energy (100mJ-class) lasers with precision wavelength control. A high energy Alexandrite laser source is an interesting alternative to Nd:YAG in future Earth Observation missions with its added scientific benefit of broad wavelength tunability...
Many trivalent rare earth ions, such as praseodymium (Pr), samarium (Sm), terbium (Tb) and dysprosium (Dy), have radiative transitions in the visible wavelength region, and those visible lasers have been reported [1]. Especially, Pr3+-doped lasers are successful so far as one of the most efficient approaches for visible lasing thanks to the development of indium gallium nitride (InGaN) diode lasers.
Optical frequency combs provide an equidistant grid of optical frequency components, enabling a wide array of diverse and new technologies [1]. One such application is photonic microwave generation where optical frequency combs provide unprecedented low-noise performance via optical frequency division [2]. Although providing excellent performance, it comes at the expense of size and complexity. In...
Mechanisms of rogue waves (RWs) emergence have been extensively studied in fiber lasers with nonlinearly driven cavities [1], Raman fiber amplifiers and lasers [2], and fiber lasers via modulation of the pump [3]. Previously, it has been found that RWs can be emerged because of soliton-soliton interaction through the overlapping of their tails or soliton-dispersive wave interaction. The result of...
Inducing and controlling lasing in the open air is an intriguing challenge. Several recent experiments on laser filamentation in air have demonstrated generation of population inversion and lasing at the 391 nm and 428 nm lines in the nitrogen molecular ion [1-8], corresponding to transitions between the ground vibrational state of the second excited electronic state, B2Σ+u, and the ground and first...
Raman fiber lasers (RFLs) are treated as perspective laser sources in spectral bands which are not available from rare-earth (RE) doped fiber lasers. Raman lasing can be easily obtained from 1.1 to 2 μm in single-mode fibers that are core-pumped by RE-doped fiber lasers generating single transverse mode. However, the RFL generation below 1, Mm is difficult because of a lack of suitable high-power...
High power linearly polarized narrow linewidth light source above the wavelength of 1600 nm are very attractive for several applications such as pump source for Cr:ZnS[1], Tm:Re2O3 (Re=Sc. Lu or Y) or nonlinear frequency conversion. Er (or Er:Yb)fibers are most popular gain media around the wavelength of 1.55 μm, though, there are few reports of Er fiber lasers above 1600 nm satisfying aforementioned...
Hollow optical fibres offer a unique photonic platform by confining light in a void which may be filled with a vacuum or a gas at low or high pressure. The lack of substantial overlap of the light with the solid parts of the fibre surrounding the hollow core also increases the fibre damage threshold and reduces the attenuation in regions where the glass is absorbing strongly. For the current generation...
Optical parametric chirped pulse amplification (OPCPA) is widely recognized as a key technique for producing intense few-cycle light pulses for attosecond science [1]. Owing to the continuous improvement of diode-pumped solid state (DPSS) lasers, the OPCPA technique is becoming ever more attractive as combining DPSS laser pump sources and OPCPA enables simultaneous scaling of peak and average power...
High-peak-power longwave OPAs operating above the wavelength of 5μm [1] require high-energy picosecond pump pulses >2 μm. These can be generated directly in laser amplifiers, e.g. Ho-doped [1, 2] or via cascaded OPAs [3]. Burst-mode pump lasers offer great advantages over single-pulse amplifiers because they help overcoming the challenges of chirped-pulse as well as direct picosecond pulse amplifiers...
The remarkable progress in nonlinear materials and laser pump sources continues to advance optical parametric oscillators (OPOs) to new frontiers in spectral and temporal coverage and performance capability, with no end in sight. The advent of a new class of mid-infrared (mid-IR) birefringent nonlinear materials such as CdSiP2 (CSP) and quasi-phase-matched (QPM) crystals such as orientation-patterned...
New laser applications as air pollutant measurement, free-space communications, range-finding, target illumination, molecular spectroscopy, medicine treatment or biomedical diagnostics, industrial technologies (plastics forming, cutting, welding, marking) require the laser radiation with the wavelength in the mid-infrared region. Meanwhile, the lasers based on gas (CO), semiconductor (lead-salt),...
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].
Femtosecond 1 μm lasers are widely used in numerous scientific and industrial applications [1, 2]. Such oscillators are intensively developed and ultrafast sub-100 fs operation has been already demonstrated in several ytterbium-doped active media. One of the most interesting among them and relatively shortly investigated is Yb:CaF2. This is a simple cubic crystal, with very broadband emission spectrum...
In recent years, the development of compact all solid-state lasers has attracted the scientific community because of their vast scientific and technological applications. In particular, ytterbium (Yb3+) laser sources have been developed with a great number of hosts, due to the promise of the Yb3+ ion related to the very simple energy level structure and absence of higher energy levels, as well as...
Solar-pumped Nd:YAG lasers are a promising renewable energy source for applications including the magnesium-hydrogen energy cycle, power beaming and satellite technologies [1]. The major issue that limits the performance of these lasers is the weak absorption of solar radiation due to the low overlap between the solar spectrum and the Nd:YAG absorption spectrum. The symmetry and homogeneity of this...
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