A5072725647- Photorefractive and Nonlinear Optics
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Advanced Optical Sensing Technologies
- Photoacoustic and Ultrasonic Imaging
- Laser-Matter Interactions and Applications
- Advanced Electron Microscopy Techniques and Applications
- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Copper Interconnects and Reliability
- Electron and X-Ray Spectroscopy Techniques
- Laser Material Processing Techniques
- High voltage insulation and dielectric phenomena
- Material Properties and Applications
- Solid State Laser Technologies
- Material Science and Thermodynamics
- Force Microscopy Techniques and Applications
- Photonic Crystals and Applications
- 3D IC and TSV technologies
- Lightning and Electromagnetic Phenomena
- Perovskite Materials and Applications
KTH Royal Institute of Technology
2021-2025
For ferroelectric ionic-conductors, polarization switching is complicated by the interplay between ion mobility and charge screening effects. When ionic carriers also play a key role in domain reversal, such as Rb-doped KTiOPO4 (RKTP), higher level of complexity introduced. RKTP provides an ideal platform for investigating relationship conductivity reversal because its highly anisotropic crystal properties allow selective modification material characteristics through diffusive cation doping....
The pursuit of advanced fiber laser technologies has driven research toward unconventional manufacturing techniques. In this work, we present an erbium-doped made using powder-based additive manufacturing. An Er 3+ /Al co-doped silica glass rod was printed powder deposition and then used as the core material in a preform. drawn from preform exhibited complete, desired functionality linked to doping. To demonstrate this, standing wave cavity formed with feedback attained cleaved ends...
A midinfrared single-photon-counting lidar at 3 µm is presented. The photons were upconverted to 790 nm in a periodically poled rubidium-doped KTiOPO4 crystal through intracavity mixing inside 1064 Nd:YVO4 laser and detected using conventional silicon single-photon avalanche detector (SPAD). system could distinguish 1 mm deep features on diffusely reflecting target, limited by the SPAD time-tagging electronics. This technique easily be extended longer wavelengths within transparency of...
We investigate a new method of coercive field engineering for periodic poling RbKTiOPO
A Nd:YVO4 laser operating at 1064 nm generating a stable mode-locked train of 10 ps-long dark pulses with 211 MHz repetition rate is presented. The mode-locking relies on periodic loss modulation produced by intra-cavity sum-frequency mixing synchronous bright-pulse from femtosecond Yb:KYW 1040 nm. depth 90% was achieved for the pulses, confirmed cross-correlation measurements. ultrafast injects power into cavity modes beyond gain bandwidth. At proper length, detuning interaction these...
We demonstrate a new method to fabricate waveguides in KTP. It allows for independently fabrication of the periodically poled grating via coercive field engineering and post-poling waveguide inscription ion exchange.
We present and discuss different methods for domain engineering in KTP. These are based on ion-exchange, useful fabrication of bulk nano-domain gratings, compatible with waveguide implementation. Full-text article not available; see video presentation
Silica fibers are highly desired due to their robustness and easy integration with existing infrastructure. Although fabrication of silica gain can be performed using well-established methods e.g., Modified Chemical Vapor Deposition (MCVD), each production cycle time-consuming expensive. Additive manufacturing (AM) on the other hand is an attractive way fabrication, where reduced waste short cycles widely recognized. Today, AM commonly used make functional components prototypes.
The development of reliable periodic poling methods that allow for sub-μm quasi-phase matched (QPM) gratings and, at the same time, waveguide implementation, is paramount importance a large number applications. For instance, backward-wave optical parametric oscillators [1] are only viable if QPM period on order magnitude as wavelengths interacting waves. Furthermore, integration such devices in format would unveil countless possibilities quantum optics employing crystal an ultrabright...