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.
Direct UV written planar waveguides in silica have been explored for over two decades [1]. The technique is capable of fabricating low-loss channel waveguides, couplers and Bragg gratings by translating an appropriate substrate through a focused UV beam. To date direct UV written waveguides have been primarily formed by using 244nm laser light, relying on the photosensitivity provided by germanium...
Diamond is an exceptional material due to its hardness, high thermal conductivity and transparency from the UV to far IR. Recently it has caught the attention of the scientific community because it is the host of different color centers that can be used for magnetic sensing applications and quantum computing [1]. One of the most promising of these defects is the nitrogen-vacancy (NV) center. The electrons...
Compact pulsed laser sources are of interest for diverse application areas. Due to their broad gain bandwidth, high Stokes efficiency and low thermal load near the 1 μm spectral region, ytterbium doped laser materials are promising for such devices. Channel waveguides in such gain media provide compact laser systems and deliver efficient single-mode laser operation with low laser thresholds. One of...
Bragg gratings were inscribed on the surface of thin GaN film grown on a sapphire substrate. These gratings are generated by illumination of 800 nm femtosecond pulses through a phase mask and a cylindrical lens.
The development of mid-infrared (λ∼3–20 μm) integrated optical sensors has accelerated within the last years. The main driving interest is the potential of using photonic integrated elements capable of direct interaction with biomolecules and chemicals through their ground molecular vibrational modes, so that resonance fingerprints are exploited for novel sensor industrial applications. State-of-the-art...
We demonstrate that a novel family of miniaturized deformed helix ferroelectric liquid crystal cells that has recently been developed in the context of distributed optical sensing networks can also be used to realize fully monolithic, actively Q-switched waveguide lasers as well as actively mode-locked all-fiber lasers. Those cells enable the development of pulsed laser sources with the same level...
The intrinsic properties of silicon (Si) make it an excellent material for integrated photonics devices with small footprints [1]. To date, most of the reported devices have been based on crystalline silicon (c-Si), but this material suffers from difficult integration with electronic layers due to fabrication constraints. Subsequently, there has been growing interest in alternative forms of Si, such...
Short distance optical communication is required to reduce power consumption of ICT systems and continuously improve performance of datacentres and HPCs [1]. Reduced energy consumption and increased bandwidth density [2-3] are required to develop optical interconnects between chips and on chips. Therefore, lasers and detectors with ultra-low operating energy have to be connected by Si nanowire waveguides...
Polycrystalline silicon (poly-Si) has attracted significant interest in the area of silicon photonics because of its potential for combining good optical transmission, electronic functionality and low fabrication cost, which makes it an attractive material for commercial applications [1]. In addition, it was shown recently that by laser processing of amorphous Si (a-Si) it is possible to obtain very...
Femtosecond laser machining combined with chemical etching offers an efficient and accurate way for producing complex three-dimensional structures out of fused silica. The versatility of the femtosecond laser machining together with the properties of fused silica makes it an ideal tool for integrating of micromechanical [1], microfluidic [2] and optical [3] devices, using the same fabrication method.
Er3+ doped single-crystalline layers are particularly interesting active media for compact waveguide lasers emitting at 1.5–1.6 μm [1]. Recently bulk monoclinic potassium double tungstates KRE(WO4)2 (RE = Y, Gd, Lu) have been shown to be excellent laser hosts for erbium ions, demonstrating efficient laser performance under direct in-band pumping into 4I13/2 energy level [2]. However, the highest doping...
Lithium niobate (LN) is one of basic materials of integrated optics used, for example, for electro and acousto-optical modulators, switches, diffraction gratings, nonlinear optical wavelength converters, and others [1]. LN-based ion exchange or Ti-indiffused photolithographic techniques are established technologies, however, some modern applications, such as high-purity suppressed carrier synthesis...
In this paper the recent advances in waveguide lasers fabricated by ultrafast laser inscription (ULI) are reported with the focus on Yb:YAG waveguide based lasers in two different operation regimes. Watt level output powers in single longitudinal mode (SLM) as well as modelocked (ML) operation are demonstrated.
There is increasing demand for low noise, narrow linewidth lasers for applications including spectroscopy, ion traps for optical clocks and gravitational waves measurements. External cavity diode lasers (ECDL) can provide a compact, low cost solution; however these are typically available at a limited range of optical frequencies. The increase in applications requiring robust laser systems (e.g. space...
Gallium nitride (GaN) is a promising material for nonlinear microresonators. It has large intrinsic χ(2) and χ(3), excellent thermal properties and a relatively large bandgap [1] and can be used for example for parametric conversion and frequency doubling [2]. Furthermore it is quite resilient and can withstand high temperatures and power. In this paper, we demonstrate GaN microring resonators with...
Widely tunable, narrow linewidth diode lasers have found a wide range of important applications, from terrestrial ones, such as fiber-optic communications [1] or optical sensing [2], to applications in space, for instance in atomic clocks [3]. Monolithic diode lasers for such tasks, i.e., distributed feedback (DFB) lasers and distributed Bragg reflector (DBR) lasers, approach their limits since they...
Silicon waveguides are widely used as optical interconnects and they are particularly important for Si-photonics. Si-based devices, along with other optical elements, are entirely fabricated on the top surface of Si wafers. However, further integration of photonic and electronic devices in the same chip requires a new approach. One alternative is to utilize the bulk of the wafer for fabricating photonic...
Optical photonic lattices attract strong interest as a flexible experimental platform with applications ranging from beam shaping and switching [1] to quantum photonics [2]. Importantly, various array designs were suggested by mapping quantum Hamiltonian dynamics to the optical beam evolution [3, 4].
During the past decade, femtosecond pulse direct-laser-written (fs-DLW) waveguides in transparent materials have emerged as an enabling technology for the production of laser-active integrated photonic devices [1]. The thulium (Tm3+) ion is attractive for its eye-safe broadband emission at ∼2 μm (3F4 → 3H6 transition). Tm waveguide lasers are interesting for environmental and medical sensing applications...
Wavelength stabilized diode lasers, such as distributed Bragg reflector (DBR) lasers, are required for many different applications. A tool for manufacturing of DBR gratings is electron beam lithography, a flexible technology with high reproducibility. The resolution enables the realization of low-order gratings with high reflectivities. For a recent process of 1030 nm DBR lasers, numerical simulations...
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.