A5091613385- Photonic and Optical Devices
- Particle Accelerators and Free-Electron Lasers
- Advanced Fiber Laser Technologies
- Gyrotron and Vacuum Electronics Research
- Semiconductor Lasers and Optical Devices
- Laser Design and Applications
- Advanced Fiber Optic Sensors
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Solid State Laser Technologies
- Laser-Matter Interactions and Applications
- Photonic Crystals and Applications
- Spectroscopy and Laser Applications
- Photorefractive and Nonlinear Optics
- Mechanical and Optical Resonators
- Advanced Photonic Communication Systems
- Silicon Nanostructures and Photoluminescence
- Photocathodes and Microchannel Plates
- Acoustic Wave Resonator Technologies
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced MEMS and NEMS Technologies
- Advanced Surface Polishing Techniques
- Optical Network Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
University of Twente
2015-2024
Chan Heart Rhythm Institute
2021
Marymount University
2019
Colorado State University
2013-2017
LioniX (Netherlands)
2016
Rijksmuseum
1987
Leiden University
1987
We demonstrate a hybrid integrated and widely tunable diode laser with an intrinsic linewidth as narrow 40 Hz, achieved single roundtrip through low-loss feedback circuit that extends the cavity length to 0.5 meter on chip. Employing solely dielectrics for single-roundtrip, single-mode resolved filtering enables narrowing increasing power, without limitations nonlinear loss. achieve single-frequency oscillation up 23 mW fiber coupled output 70-nm wide spectral coverage in 1.55 μm wavelength...
We demonstrate supercontinuum generation in stoichiometric silicon nitride (Si3N4 SiO2) integrated optical waveguides, pumped at telecommunication wavelengths. The pump laser is a mode-locked erbium fiber wavelength of 1.56 µm with pulse duration 120 fs. With waveguide-internal energy 1.4 nJ and waveguide 1.0 × 0.9 cross section, designed for anomalous dispersion across the 1500 nm range, output spectrum extends from visible, around 526 nm, up to mid-infrared, least 2.6 µm, instrumental...
We report ultra-broadband supercontinuum generation in high-confinement Si3N4 integrated optical waveguides. The spectrum extends through the visible (from 470 nm) to infrared spectral range (2130 comprising a bandwidth wider than 495 THz, which is widest generated on chip.
Hybrid integrated semiconductor laser sources offering extremely narrow spectral linewidth as well compatibility for embedding into photonic circuits are of high importance a wide range applications. We present an overview on our recently developed hybrid-integrated diode lasers with feedback from low-loss silicon nitride (Si3N4 in SiO2) circuits, to provide sub-100-Hz-level intrinsic linewidths, up 120 nm coverage around 1.55 um wavelength, and output power above 100 mW. show...
Coherent optomechanical interaction known as stimulated Brillouin scattering (SBS) can enable ultrahigh resolution signal processing and narrow-linewidth lasers. SBS has recently been studied extensively in integrated waveguides; however, many implementations rely on complicated fabrication schemes. The absence of standard mature platforms prevents its large-scale circuit integration. Notably, the emerging silicon nitride (Si3N4) photonic integration platform is currently out reach because...
In this paper we present a novel fabrication technique for silicon nitride (Si3N4) waveguides with thickness of up to 900 nm, which are suitable nonlinear optical applications. The method is based on etching trenches in thermally oxidized and filling the Si3N4. Using no stress-induced cracks Si3N4 layer were observed resulting high yield devices wafer. propagation losses obtained measured be as low 0.4 dB/cm at wavelength around 1550 nm.
We describe the first demonstration and characterization of an optically integrated InP-Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> hybrid laser. The laser is formed by integration InP-based reflective semiconductor optical amplifier with a based feedback waveguide circuit. circuit comprises frequency selective tunable Vernier mirror composed two microring resonators slightly...
Generating visible light with wide tunability and high coherence based on photonic integrated circuits is of interest for applications in biophotonics, precision metrology, quantum technology. Here we present, to our knowledge, the first demonstration a hybrid-integrated diode laser spectral range. Using an AlGaInP optical amplifier coupled low-loss <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi...
We present hybrid-integrated extended cavity diode lasers tunable around 637 nm, with a gain-wide spectral coverage of 8 nm. This tuning range addresses the zero-phonon line nitrogen-vacancy centers and includes wavelength HeNe (633 nm). Best performance shows wide mode-hop free up to 97 GHz narrow intrinsic linewidth down 10 kHz. Also, maximum output power is 2.5 mW in single-mode fiber, corresponding an on-chip 4.0 mW. Full integration packaging standard housing fiber pigtails provide high...
Extending the cavity length of diode lasers with feedback from Bragg structures and ring resonators is highly effective for obtaining ultra-narrow laser linewidths. However, extension also decreases free-spectral range cavity. This reduces wavelength continuous tuning that can be achieved a given phase shift an intracavity element. We present method increases to short equivalent cavity, while maintaining linewidth long Using single-frequency hybrid integrated InP-Si3N4 120 nm coverage around...
Hybrid integrated diode lasers have so far been realized using silicon, polymer, and silicon nitride (Si3N4) waveguide platforms for extending on-chip tunable light engines from the infrared throughout visible range. Here we demonstrate first hybrid laser aluminum oxide (Al2O3) deep-UV capable platform. By permanently coupling low-loss Al2O3 frequency-tunable Vernier feedback circuits with GaN double-pass amplifiers in a hermetically sealed housing, extended cavity (ECDL) near UV. The shows...
Recent progress in short wavelength free-electron lasers extending from the extreme ultraviolet through x-ray regime have opened new avenues for industrial and research applications. A high-gain/low-Q oscillator, i.e., a regenerative amplifier laser (RAFEL), is one possible concept. In this paper, we present first analysis of efficiency enhancement RAFEL with long, tapered undulator line. For analysis, consider high average power EUV at 13.5 nm show that performance exceeds single-pass,...
We report the observation of second-harmonic generation in stoichiometric silicon nitride waveguides grown via low-pressure chemical vapour deposition. Quasi-rectangular with a large cross section were used, height 1 {\mu}m and various different widths, from 0.6 to 1.2 {\mu}m, lengths 22 74 mm. Using mode-locked laser delivering 6-ps pulses at 1064 nm wavelength repetition rate 20 MHz, 15% incoming power was coupled through waveguide, making maximum average powers up 15 mW available...
We report on a novel type of laser in which semiconductor optical amplifier (SOA) receives frequency-selective feedback from glass-waveguide circuit. The we present here is based InP for operation the 1.55 μm wavelength range. Si<sub>3</sub>N<sub>4</sub>/SiO<sub>2</sub> glass waveguide circuit comprises two sequential high-Q ring resonators. Adiabatic tapering used maximizing feedback. shows single-frequency oscillation with record-narrow spectral linewidth 24 kHz at an output power 5.7...
Free-electron lasers (FELs) have been built ranging in wavelength from long-wavelength oscillators using partial wave guiding through ultraviolet hard x-ray FELs that are either seeded or start noise (SASE). Operation the spectrum has relied on single-pass SASE due to lack of seed difficulties design mirrors. However, recent developments production diamond crystal Bragg reflectors point way regenerative amplifiers (RAFELs) which are, essentially, low-Q free-electron laser (XFELOs) out-couple...
We describe a procedure for the simulation of free-electron-laser (FEL) oscillators. The uses combination MEDUSA code FEL interaction and OPC to model resonator. simulations are compared with recent observations oscillator at Thomas Jefferson National Accelerator Facility in substantial agreement experiment.
We present an integrated hybrid semiconductor-dielectric (InP-Si3N4) waveguide laser that generates frequency combs at a wavelength around 1.5 μm with record-low intrinsic optical linewidth of 34 kHz. This is achieved by extending the cavity photon lifetime using low-loss dielectric circuit. In our experimental demonstration, on-chip, effective path length extended to 6 cm. The resulting narrowing shows high potential highly coherent direct electrical pumping, based on and heterogeneous...
We demonstrate that photonic crystals can be used to generate powerful and highly coherent Cherenkov radiation is excited by the injection of a beam free electrons. Using theoretical numerical investigations we present startup dynamics coherence properties such laser, in which gain provided matching optical phase velocity crystal electron beam. The operating frequency varied changing energy scaled different ranges varying lattice constant crystal.
The resolution in x-ray coherent diffractive imaging applications can be improved by increasing the number of photons optical pulse. An free-electron laser (XFEL) producing pulses with terawatt (TW) peak power and about 10 femtosecond duration satisfy this requirement. In paper, we consider conditions necessary for achieving powers excess 1 TW a 1.5 Å FEL. Using MINERVA simulation code, an extensive steady-state analysis has been conducted using variety undulator focusing configurations....
Free-electron lasers (FELs) have been built ranging in wavelength from long-wavelength oscillators using partial wave guiding through ultraviolet hard x-ray that are either seeded or start noise. In addition, FELs produce different polarizations of the output radiation linear elliptic to circular polarization currently under study. this paper, we develop a three-dimensional, time-dependent formulation is capable modeling large variety FEL configurations including polarizations. We employ...
We theoretically investigate the use of Rayleigh surface acoustic waves (SAWs) for refractive index modulation in optical waveguides consisting amorphous dielectrics. Considering low-loss Si$_3$N$_4$ with a standard core cross section 4.4$\times$0.03 $\mu$m$^2$ size, buried 8 $\mu$m deep SiO$_2$ cladding we compare wave generation various different geometries via piezo-active, lead zirconate titanate film placed on top and driven an interdigitized transducer (IDT). Using numerical solutions...
We present a model for quasi-phase matching (QPM) in high-order harmonic generation (HHG). Using one-dimensional description, we analyze the time-dependent, ultrafast wave-vector balance to calculate on-axis output versus time, from which obtain pulse energy. Considering, as an example, periodically patterned argon gas, may be provided with grid cluster jet, during different time intervals within drive laser duration. find that identifying suitable single spatial period is not...
Hybrid integrated diode lasers based on combining semiconductor optical amplifiers with low-loss Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> -based feedback circuits enable great laser performance for advanced photonic circuits. In particular, using high-Q ring resonators frequency-selective provides wide spectral coverage, mode-hop free tuning, and high frequency stability...