A5058097203- Quantum Information and Cryptography
- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Random lasers and scattering media
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Hungarian Social, Economic and Educational Studies
- Intraocular Surgery and Lenses
- Ophthalmology and Visual Impairment Studies
- Advanced Optical Sensing Technologies
- Quantum Mechanics and Applications
- Orbital Angular Momentum in Optics
- Corneal surgery and disorders
Budapest University of Technology and Economics
2020-2025
Abstract Based on wavefront sensor images an objective and quantitative method is presented for characterising cataract. By separating direct scattered light in the focal plane of microlenses, new procedure able to make two-dimensional maps spatial variation scattering properties crystalline lens, also provides a single figure descriptive whole eye. The developed evaluation algorithm successfully quantifies cataract, especially that nuclear type. To demonstrate its operation, custom-built...
A small, portable, high-flux correlated photon-pair source has been designed and constructed from simple opto-mechanical parts. Unique to this device is its straightforward alignment process, together with the direct coupling of signal idler photons into polarization-maintaining single-mode optical fibers. Spontaneous parametric down-conversion used produce photon pairs in β-barium borate (BBO) at a center wavelength 810 nm. Owing applied type-I phase-matching, coincident have identical...
The transverse momentum correlation of photon pairs generated by noncollinear spontaneous parametric down-conversion with type-I phase matching is transformed into polarization entanglement. A robust wavefront-splitting interferometer scheme used, due to which the entangled state does not require active stabilization. Frequency-degenerate signal and idler photons are separated coupled single-mode optical fibers. concept demonstrated in a compact modular setup. straightforward alignment...
Entangled photon sources introduce phase shift between polarization states. Exceeding coherence length, coincidence rate drops for certain bases. Correlation is restored by compensation. Applying anisotropic retarders doubles.
Our recently published photon source has been enhanced in terms of robustness and spectral width. Thanks to a custom breadboard rigidity increased by 350%, due 10nm filtering the heralding ratio grew 39%.