| 1. |
- Liljestrand, Charlotte, et al.
(författare)
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Ion-Exchange Induced Coercive Field Gratings for QPM Devices in Rb-doped KTP
- 2016
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Ingår i: 2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO). - Washington, D.C. : IEEE conference proceedings. - 9781943580118
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Konferensbidrag (refereegranskat)abstract
- We demonstrate 3.16 mu m periodic poling in RKTP using a coercive field grating induced by ion-exchange. The process results in a linear refractive index change over the sample thickness, adding extra tunability to the QPM device.
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| 2. |
- Etcheverry, Sebastián, et al.
(författare)
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Optofludics in microstructured fibers combining particle elasto-inertial focusing and fluorescence
- 2016
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Ingår i: 2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO). - Washington, D.C. : IEEE conference proceedings. - 9781943580118
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Konferensbidrag (refereegranskat)abstract
- Optofluidics is exploited in an all-fiber component to detect and identify through fluorescence particles flowing at high rate and inertially focused in a capillary. The system represents a first step towards an in-fiber flow cytometer.
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| 3. |
- Widarsson, Max, 1994-, et al.
(författare)
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Mid-infrared photon counting by intra-cavity up-conversion for LiDAR
- 2019
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Ingår i: Optics InfoBase Conference Papers. - : OSA - The Optical Society.
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Konferensbidrag (refereegranskat)abstract
- In range resolved differential absorption LIDAR for gas concentration measurement, an attractive solution would be mid-infrared (MIR) micro-pulse LIDAR with photon counting detection. Single-photon detection in MIR is, however, difficult because of the low photon energy. Both superconducting nanowire detectors and low bandgap APDs need cryogenic cooling and are still limited to wavelengths shorter than approximately 2.5 µm.
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| 4. |
- Kianirad, Hoda, et al.
(författare)
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Domain wall motion in stoichiometric LiTaO3 induced by low-energy electron beam
- 2019
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Ingår i: Applied Physics Letters. - : AMER INST PHYSICS. - 0003-6951 .- 1077-3118.
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Tidskriftsartikel (refereegranskat)abstract
- Scanning electron microscopy was used to study the mobility of domain walls in vapor-transport equilibrated stoichiometric LiTaO3. By using low-acceleration voltage, switching occurs solely for polarization pointing-up domains, resulting in fast domain-wall motion. When the incoming electron beam was more energetic with larger penetration depth, the switching instead occurred for polarization pointing down domains. Our results are discussed in terms of the interaction of the scanning electron beam with the polarization-screening charges at the crystal surface.
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| 5. |
- Etcheverry, Sebastián, et al.
(författare)
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Trapping and optical identification of microparticles in a liquid with a functional optical fiber probe
- 2018
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Ingår i: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper AM4P.6. - : Optical Society of America. - 9781557528209
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Konferensbidrag (refereegranskat)abstract
- A fiber probe traps single micrometer-particles by fluid suction into a hollow microstructure and enables optical identification by the fluorescence light collected in a fiber core. The probe finds applications in life-science and environmental monitoring.
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| 6. |
- Malmstrom, Mikael, et al.
(författare)
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Waveguides in polycrystalline diamond for mid-IR sensing
- 2016
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Ingår i: Optical Materials Express. - 2159-3930. ; 6:4, s. 1286-1295
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Tidskriftsartikel (refereegranskat)abstract
- 8 mm long channel waveguides were manufactured in polycrystalline diamond with inductively coupled plasma etching and characterized in terms of mode-profile and propagation loss in the 1.5 - 3.4 mu m spectral region. As proof of principle, the waveguides were evaluated in an evanescent field sensing setup targeting the CH absorption peak of isopropanol at similar to 3.4 mu m, showing good agreement with numerical finite element simulations. (C) 2016 Optical Society of America
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| 7. |
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| 8. |
- Mutter, Patrick, et al.
(författare)
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Ion-exchanged waveguides in periodically poled Rb-doped KTiOPO4 for efficient second harmonic generation
- 2020
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Ingår i: Optics Express. - : Institute of Electrical and Electronics Engineers (IEEE). - 1094-4087. ; 28:26
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Tidskriftsartikel (refereegranskat)abstract
- An ion-exchange process has been developed for periodically poled Rb-dopedKTiOPO4(RKTP) which warrants high efficiency and low loss channel waveguides. The domainstability was investigated, and it was found that domain gratings with uncharged walls couldstand the ion-exchange process without deterioration. 3.1 mW of blue second harmonic lightwas generated from 74 mW of radiation at 940.2 nm coupled into an 8μm wide and 7 mm longwaveguide, corresponding to a normalized conversion efficiency of 115%/Wcm2. Waveguides inPPRKTP open the possibility for stable operation at high optical powers, as well as generatingentangled photons at low optical powers, and enable the investigation of novel nonlinear processessuch as counter-propagating interactions in a waveguide format.
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| 9. |
- Pereira, Joao, et al.
(författare)
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Poling optical fibers with UV lamp
- 2019
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Ingår i: Conference on Lasers and Electro-Optics OSA Technical Digest (Optical Society of America, 2019), paper SM2L.5. - : OSA - The Optical Society. - 9781557528209
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Konferensbidrag (refereegranskat)abstract
- Silicate fibers with internal electrodes are optically poled without a laser by side-exposure to radiation from a UV tubular lamp. Electrooptic coefficients χ(2) ~ 0.04 pm/V and Vπ = 810 V are obtained.
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| 10. |
- Sørgård, T., et al.
(författare)
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Reduced loss in SiGe-core optical fibers
- 2018
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Ingår i: Optics InfoBase Conference Papers. - : Optical Society of America. - 9781557528209
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Konferensbidrag (refereegranskat)abstract
- We investigate CO2 laser processing of SiGe-core glass fibers, and show that homogeneous, low optical loss cores can be made. Coaxial Ge-rich centers within the semiconductor cores can also be fabricated.
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