The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Nonlinear optical frequency conversion in plasmonics has attracted immense research attention recently. Through various device geometries, harmonic generations of various orders have been reported. However, in these demonstrations, the near-field effect utilized has been limited to localized surface plasmons. It was not until last year that nonlinear frequency conversion utilizing propagating surface...
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...
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...
Laser operation of Nd+3-doped gadolinium scandium gallium garnet (Nd:GSGG) has been first shown by Kaminskii et al. in 1976 [1]. In earlier studies, flaslamp or solar pumping of Nd:GSGG has been explored, and narrow absorption bands of the Nd+3 ion, that overlaps poorly with these broadband emitters resulted in low laser efficiencies. As a solution, co-doping with chromium ion (Cr:Nd:GSGG) has been...
Lasers emitting around 2 μm (eye-safe spectral range) are of practical importance for remote sensing, spectroscopy and medicine. Such emission is typically achieved from Tm3+ (3F4 →3H6 transition) and Ho3+ ions (5I7 → 5I8 transition). The search for appropriate saturable absorbers (SAs) for passive Q-switching (PQS) of ∼2 μm lasers is still ongoing. While “slow” SAs, e.g. Cr2+:ZnS, are well-established,...
Visible pulsed lasers are required for many applications, for example in biomedical imaging [1] and STED microscopy [2]. Such applications often have stringent requirements on the wavelength and pulse duration, which are not directly available from typical solid-state sources. One method of accessing these wavelengths is to use Raman lasers, with diamond being an excellent Raman laser material [3,...
Mode-locked fiber lasers emitting in the wavelength range beyond 2 μm [1] are promising for a number of applications including environmental sensing, material processing, medicine etc. Mode-locked holmium fiber lasers tend to operate below 2.1 μm wavelength. For some applications it is important to shift the laser wavelength further to the infrared. Previous demonstration of a 2107-nm mode-locked...
Femtosecond mode-locked lasers near 2 μm based on the Tm3+ ion have been drawing great attention since they are applied in various fields including physics, chemistry and biology [1]. Among the host materials for Tm3+, the monoclinic double tungstate crystals are one of the most promising for ultrashort pulse generation [2]. Recently, we successfully demonstrated efficient laser operation of a new...
Nowadays, the wide expansion of information technologies requires drastic increase the capabilities of fiber optic communication lines. One of the ways for solution of this problem is the development of 1200–1350 nm spectral range, so called, second telecommunication window, in which silica fiber has close-to-zero chromatic dispersion. Tetravalent chromium doped forsterite Cr4+:Mg2SiO4 (C-F) based...
Titanium-doped AI2O3 (Ti:sapphire) laser can be directly pumped by recently developed green and blue indium gallium nitride (InGaN) laser diodes (LDs), and mode-locking operations of the laser with these pump sources have already been reported from several groups. Rohrbacher et al. achieved an average output power of 460 mW using two 2.9-W LDs at 450 nm, and a pulse width of 82 fs was obtained by...
Tm doped materials are very attractive for highly efficient high power short pulse lasers in the wavelength range of two micrometer due to their broad gain bandwidths and the two-for-one pumping process with high power 800 nm laser diodes (LD). Among them, Tm doped sesquioxides (Tm:Re2O3, Re=Sc, Lu or Y) are among the most promising gain materials as they possess superior thermal and mechanical properties...
Cr:LiSAF posses broad emission bands in the near infrared, that facilitates widely tunable laser operation (770–1110 nm), and generation of 10-fs light pulses via mode-locking [1-4]. It owns broad absorption bands in the visible where low-cost laser diodes around 650 nm could be used for efficient pumping. On the other hand, Cr:LiSAF display glass-like properties in terms of mechanical and thermal...
Photonic neuromorphic engineering has emerged as an alternative computational paradigm that aims at tackling the impediments of typical von Neumann architectures, in addressing complex problems like machine vision and RF cognitive management [1]. Photonic neuron primitives are based on the dynamics of semiconductor lasers and have received attention due to the similarity of their dynamics with that...
High power ultrafast laser sources at 2 μm are highly desirable as primary sources in many fields such as mid-IR generation, remote sensing, Lidar systems, and medical use. Ho:YAG is an excellent gain crystal for such kind of sources due to its low quantum defect, good crystal quality and broad emission bandwidth. To date, Ho:YAG has been utilized in q-switched and actively mode-locked systems [1,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.