A5032424025- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Photorefractive and Nonlinear Optics
- Laser Design and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Optical Coherence Tomography Applications
- Advanced Frequency and Time Standards
- Spectroscopy and Laser Applications
- Optical Imaging and Spectroscopy Techniques
- Atomic and Molecular Physics
- Semiconductor Quantum Structures and Devices
- Photoacoustic and Ultrasonic Imaging
- Non-Invasive Vital Sign Monitoring
- Advanced Fluorescence Microscopy Techniques
- Hemodynamic Monitoring and Therapy
- Random lasers and scattering media
- Photonic Crystal and Fiber Optics
- Digital Holography and Microscopy
- Atomic and Subatomic Physics Research
- Orbital Angular Momentum in Optics
- Optical Coatings and Gratings
- Laser-Matter Interactions and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
Danish Technological Institute
2025
Technical University of Denmark
2014-2024
Chinese Academy of Sciences
2021
Shanghai Institute of Microsystem and Information Technology
2021
Aarhus University
2011-2020
Foton Motors (China)
2016-2019
Bellingham Technical College
2017-2018
Danish National Research Foundation
2009-2014
University of Copenhagen
2013
Fraunhofer Institute for Toxicology and Experimental Medicine
2011
Control over the motional degrees of freedom atoms, ions, and molecules in a field-free environment enables unrivalled measurement accuracies but has yet to be applied highly charged ions (HCIs), which are particular interest future atomic clock designs searches for physics beyond Standard Model. Here, we report on Coulomb crystallization HCIs (specifically (40)Ar(13+)) produced an electron beam ion trap retrapped cryogenic linear radiofrequency by means sympathetic cooling through...
While there exist many Monte Carlo (MC) programs for solving the radiative transfer equation (RTE) in biological tissues, we have identified a need an open-source MC program that is sufficiently user-friendly use education environment, which detailed knowledge of compiling or UNIX command-line cannot be assumed. Therefore, introduce MCmatlab, codebase thus far consisting (a) fast three-dimensional RTE solver and (b) finite-element heat diffusion Arrhenius-based thermal tissue damage...
Abstract Cardiovascular disease is one of the leading causes death in United States and obesity significantly increases risk cardiovascular disease. The measurement blood pressure (BP) critical monitoring managing hence new wearable devices are being developed to make BP more accessible physicians patients. Several wearables utilize photoplethysmography from wrist vasculature derive assessment although many these still at experimental stage. With ultimate goal supporting instrument...
Storage and cooling of highly charged ions require ultra-high vacuum levels obtainable by means cryogenic methods. We have developed a linear Paul trap operating at 4 K capable very long ion storage times about 30 h. A conservative upper bound the H(2) partial pressure 10(-15) mbar (at K) is obtained from this. External injection possible optimized optical access for lasers provided, while exposure to black body radiation minimized. First results its operation with atomic molecular are...
Cherenkov imaging in radiation therapy provides key knowledge of the delivery treatment plans, but light-tissue interactions alter emitted spectral signal and cause modeling emission relative to dose highly modulated plans be complex. A 2-stage Monte Carlo approach was developed that leverages a traditional planning system with an optical simulation provide widely useable efficient tool for every beam control point interpretation highly-modulated plans. The spectra were estimated 6, 10, 15MV...
In laser lighting, a major benefit over other lighting techniques is the possibility to achieve very high luminous exitance. Focusing exciting small spot size on phosphor, however, does not necessarily provide emitting area for white light. this study we investigate experimentally and numerically relationship between light incident blue size. We show that specific phosphor material properties have significant impact achievable minimum This constitutes limitation in has important implications...
We present the use of Douglas-Gunn Alternating Direction Implicit finite difference method for computationally efficient simulation electric field propagation through a wide variety optical fiber geometries. The can accommodate refractive index profiles arbitrary shape and is implemented in tool called BPM-Matlab. validate BPM-Matlab by comparing it to published experimental, numerical, theoretical data commercially available state-of-the-art software. It user-friendly, fast, open-source....
We report four-wave mixing with different polarization and spatial modes in a single 4H-silicon carbide photonic device. Our device shows great potential to perform high-dimensional multiplexing for optical communication entanglement quantum networks. use polarization-insensitive grating coupler multimode microring resonator that supports three mode resonances. Finally, we show the dependence of third-order nonlinearity carbide. The measured nonlinear refractive index light polarized along...
4H‐silicon carbide (SiC) integrated platforms have shown great potential in quantum and nonlinear photonics. However, the thermal properties of 4H‐SiC waveguides are still unknown, even though thermo‐optic effects can play an important role fundamental measurements practical applications. Herein, a microring resonator comprehensively studied, by means both temperature tuning self‐heating. The coefficient ratio between absorption diffusion quantitatively measured to be , respectively....
Within the field of high-power second harmonic generation (SHG), power scaling is often hindered by adverse crystal effects such as thermal dephasing arising from (SH) light, which imposes limits on that can be generated in many crystals. Here we demonstrate a concept for efficient single-pass SHG beyond using cascade nonlinear crystals, first chosen high efficiency and subsequent crystal(s) are handling ability. Using this highly concept, generate 3.7 W continuous-wave diffraction-limited...
A single ion is enough: Ion reaction rates and product branching ratios could be determined through repeated regeneration of the original target by photodissociation after each reaction. The molecule was identified nondestructive mass spectrometry. Finally, regenerated molecular (see picture).
In this paper, we investigate the noise performance and transfer in a titanium sapphire (Ti:S) laser system. This system consists of distributed Bragg-reflector tapered diode laser, which is frequency doubled two cascaded nonlinear crystals used to pump Ti:S oscillator. investigation includes electrical characterizations utilized power supplies, optical fundamental light, second harmonic finally femtosecond pulses emitted by laser. Noise features originating from electric supply are evident...
Watt-level yellow emitting lasers are interesting for medical applications, due to their high hemoglobin absorption, and efficient detection of certain fluorophores. In this paper, we demonstrate a compact robust diode-based laser system in the spectral range. The generates 1.9 W single-frequency light at 562.4 nm by cascaded single-pass frequency doubling 1124.8 emission from distributed Bragg reflector (DBR) tapered diode. absence free-space cavity makes stable over base-plate temperature...
We report on coherent beam combining of three high brightness tapered amplifiers seeded by a single-frequency laser at λ = 976 nm in simple architecture with efficientlycooled emitters.The maximal combined power 12.9 W is achieved efficiency > 65 % limited the intrinsic quality amplifiers.The cleans up spatial profile, as content central lobe increases to 86 %.This highbrightness infrared converted into visible second harmonic generation, and results non-linear conversion 4.5 %/W maximum...
The first steps toward the implementation of a simple scheme for rotational cooling MgH+ ions based on state optical pumping is considered. various aspects such an experiment are described in detail, and state-selective dissociation spectra translationally vibrationally cold presented, with without laser being present. While as yet not evident, results showed evidence change distribution presence laser.
The cascading of nonlinear crystals has been established as a simple method to greatly increase the conversion efficiency single-pass second-harmonic generation compared single-crystal scheme. Here, we show for first time that technique can be extended sum frequency generation, despite differences in phase relations involved fields. An unprecedented 5.5 W continuous-wave diffraction-limited green light is generated from mixing two diode lasers periodically poled (conversion 50%). generally...
Diode lasers have proven to be versatile light sources for a wide range of applications. Nonlinear frequency conversion high brightness diode has recently resulted in visible power levels the watts enabling an increasing number applications within biophotonics. This review provides overview developments nonlinear converted laser diodes spectral range. Single-pass doubling is presented as nonsophisticated method achieve watt-level output powers and possible routes higher efficiency are...
We present a method to measure the decay rate of first excited vibrational state polar molecular ions that are part Coulomb crystal in cryogenic linear Paul trap. Specifically, we have monitored $|\ensuremath{\nu}=1,J=1{⟩}_{X}$ towards $|\ensuremath{\nu}=0,J=0{⟩}_{X}$ level ${\mathrm{MgH}}^{+}$ by saturated laser excitation $|\ensuremath{\nu}=0,J=2{⟩}_{X}\mathrm{\text{\ensuremath{-}}}|\ensuremath{\nu}=1,J=1{⟩}_{X}$ transition followed selective resonance enhanced two-photon dissociation out...
Sympathetic Coulomb crystallization of highly charged ions, retrapped in a cryogenic radiofrequency trap, is demonstrated by an over seven orders-of-magnitude decrease motional temperature.
Purpose: To study the proteome of subretinal fluid (SRF) from rhegmatogenous retinal detachment (RRD) in search for novel markers improved diagnosis and prognosis RRD. Methods: Human undiluted SRF obtained during vitrectomy primary RRD using a 41-gauge needle (n = 24) was analyzed compared to vitreous humor 2-day postmortem eyes 20). Sample preparation underwent nanoflow liquid chromatography–tandem mass spectrometry. Label-free quantification (LFQ) MaxQuant used determine differentially...