A5030524478- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Optical Coherence Tomography Applications
- Photoacoustic and Ultrasonic Imaging
- Advanced Fluorescence Microscopy Techniques
- Laser Material Processing Techniques
- Molecular Junctions and Nanostructures
- Nonlinear Optical Materials Studies
- Advanced Fiber Optic Sensors
- Spectroscopy and Laser Applications
- Photonic Crystals and Applications
- Radiation Dose and Imaging
- Photodynamic Therapy Research Studies
- Advanced Radiotherapy Techniques
- Analytical Chemistry and Sensors
- Photopolymerization techniques and applications
- Photoreceptor and optogenetics research
- Cultural Heritage Materials Analysis
- Medical Imaging Techniques and Applications
- Pigment Synthesis and Properties
- Laser Design and Applications
Laboratoire de Physique des Lasers, Atomes et Molécules
2024
Université de Lille
2021
Fonctions Optiques pour les Technologies de l’information
2017-2020
Université de Rennes
2019-2020
Centre National de la Recherche Scientifique
2019-2020
Institut National des Sciences Appliquées de Rennes
2019
We demonstrate a 2 mm diameter highly multimodal nonlinear micro-endoscope allowing label-free imaging of biological tissues. The endoscope performs multiphoton fluorescence (3-photon, 2-photon), harmonic generation (second-SHG and third-THG) coherent anti-Stokes Raman scattering (CARS) over field view 200 µm. is based on double-clad antiresonant hollow core fiber featuring high transmission window (850 nm to 1800 nm) that functionalized with short piece graded-index (GRIN) fiber. When...
In this Letter, we report a high-efficiency, miniaturized, ultra-fast coherent beam, combined with 3D-printed micro-optics directly on the tip of multicore fiber bundle. The highly compact device footprint (180 µm in diameter) facilitates its incorporation into minimally invasive ultra-thin nonlinear endoscope to perform two-photon imaging.
We present the first demonstration of a vertical cavity surface emitting laser (VCSEL) based on InAs quantum dots (QDs) InP. A very high density 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sup> cm xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> per QD layer, and thin spacing layer 15 nm are used to enhance modal gain within VCSEL cavity. Continuous wave (CW) operation is demonstrated at room temperature optically pumped devices...
A high-power InAs quantum dot (QD) vertical-external-cavity surface-emitting laser emitting at 1.5 μm is reported. The active region employs 20 layers of high-density Stranski–Krastanow dots on an InP substrate. QD density and emission wavelength were independently adjusted by employing a double-cap growth sequence. Optimization the spacer layer thickness strain compensation rendered possible nucleation relatively high number per antinode electromagnetic standing wave, which in turn enabled...
Owning to their intrinsic properties, silica-based glasses are widely used in various technological fields, especially photonics. However, high degree of flexibility is yet challenging realization next-generation miniaturized optical components. In this work, we develop an approach based on ‶Solmers″ hybrid resins allowing versatile two-photon polymerization 3D printing silica with 23 nm resolution, doping Germanium and/or rare-earths elements. Other dopants such as gold nanoparticles were...
We report high-power second-harmonic generation of 760 nm laser light from optically-pumped vertical-external-cavity surface-emitting based on quantum dot active medium. The generates ~1.2 W in fundamental transverse mode with fixed linear polarization. emission wavelength can be continuously tuned 738 to 778 by using an intra cavity birefringent filter for radiation without readjustment phase-matching angle the nonlinear crystal. result constitutes a viable alternative applications...
Spectral dependence of Lamb coupling constant C is experimentally investigated in an InGaAlAs Quantum Wells active medium. An Optically-Pumped Vertical-External-Cavity Surface-Emitting Laser designed to sustain the oscillation two orthogonally polarized modes sharing same region while separated rest cavity. This laser design enables tune independently wavelengths and, at time, apply differential losses order extract without any extrapolation actual constant. found be almost and equal 0.84 ±...
We demonstrate a highly multimodal nonlinear micro-endoscope for real-time, label-free imaging of biological tissues. The endoscope can perform two and three photon excited fluorescence, second, third harmonic CARS different excitation wavelengths. Ultrashort pulses are delivered to the sample by double-clad antiresonant hollow core fiber over 800-1800 nm spectral band. tip is placed into doubly resonant piezoelectric tube which allows spiral scanning on sample. distal head containing device...
Summary form only given. In this work, we report on the first room temperature quantum dot (QD) vertical cavity surface emitting laser(VCSEL) operating at 1545 nm InP substrate. QD growth has been studied to optimize density and wavelength for an operation 1520 nm. High photoluminescence efficiency low linewedth (125 nm) is obtained a 5 stacked structure. The VCSEL gain structure composed of three groups five layers grown InP(311)B, inserted in microcavity defined by full dielectric bragg...
The homogeneous linewidth of two inhomogeneous media is investigated by Spectral Hole Burning in resonant excitation conditions for the purpose dual-frequency VECSEL engineering. We performed experiments on InAs/InP Quantum Dashes and Dots, as well InGaAs/InP Wells to get a reference behavior. Experimental evidences show that Dots having different energies inside whole QD population are less coupled than Dashes. At low temperature 77K, only 0.73 meV QDs versus 1.17 QDashes. With increasing...
We experimentally investigate the Lamb coupling constant C in InGaAlAs Quantum Wells active medium. An Optically-Pumped Vertical-External-Cavity Surface-Emitting Laser emitting at 1.54 μ m is designed to sustain oscillation of two orthogonally polarized modes sharing same region while separated by 1 mm rest cavity. It enables tune independently wavelengths and apply differential losses order directly measure constant. found be almost equal 0.839 ±0.023 for a wavelength difference between...
Vertical-external-cavity surface-emitting lasers employing QDs as gain media in comparison to QW-based VECSELs can offer beneficial lasing features, such as, temperature resilience, broadband and wider wavelength tunability. We demonstrate the first QD-based VECSEL providing 2 W emission at 1.5 µm a tuning range of 60 nm. This achievement paves way multi-Watt with extended
We theoretically compute the coupling constant C between two emission modes of an extended cavity laser with a multiple quantum-well active layer. use optimized Monte Carlo model based on Markov chain that describes elementary events carriers and photons over time. This allows us to evaluate influence transition from class A B illustrates best stability dual-mode lasers is obtained former. In addition, extension makes it possible different mode profiles in as well spatial diffusion and/or...
We present a flexible, compact, 2photon, 3photon, SHG and CARS nonlinear endo-microscope featuring 2.2 mm outer diameter length of 34 mm. It uses negative curvature hollow-core double-clad fiber that is scanned with resonant piezo-scanner. The design allows distortion-less, background-free delivery femtosecond picosecond excitation pulses the back-collection signals through same fiber. Sub-micron spatial resolution together >300 microns field view made possible using micro-lenses or GRIN...
We demonstrate 3-photon fluorescence micro-endoscopy using a negative curvature hollow core fiber and 2.2 mm miniature scanning head. The design allows distortion-less, delivery of <100 fs pulses without dispersion pre-compensation requirements. also features double cladding allowing the back-collection nonlinear signals through same fiber. Sub-micron spatial resolution together with large field view is made possible by combination distal objective lens functionnalization output GRIN spliced...