25TH SYMPOSIUM ON PHOTONICS AND OPTICS SPO 2024

Session

Advances in Nonlinear Optics and Laser-Matter Interactions

Nov 7, 2024, 11:00 AM

Room 103 (Zoom and Faculty of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)

Conveners

Advances in Nonlinear Optics and Laser-Matter Interactions: 1

• Danylo Babich (PSI - Paul Scherrer Institut)

Advances in Nonlinear Optics and Laser-Matter Interactions: 2

• Danylo Babich (PSI - Paul Scherrer Institut)

19. Laser ultrasonics for the excitation of ultrafast acoustics or ultra-intense ultrasounds

Dr Thomas Pezeril (CNRS)

11/7/24, 11:00 AM

Invited Talk

In the present talk, I will review the latest results which we have obtained dealing with ultrafast linear and nonlinear acoustics. I will describe our findings related to the excitation of non-destructive shock waves, as well as some results related to the superposition of shock waves for optimum laser excitation.

8. The effect of substrate temperature in laser-induced high velocity micro-particle impacts

Dr Ievgeniia Chaban (Laboratoire de Mecanique des Solides, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France)

11/7/24, 11:30 AM

Invited Talk

The impact of microscale particles with a surface is of fundamental importance in surface coating technologies such as laser-induced forward transfer or cold spray. Successful bonding between the particles and the substrate requires impact velocities higher than the so-called critical adhesion velocity. Previous experimental and theoretical results showed that the critical velocity is a...

64. Photoacoustic technique for determining optical absorption coefficients in nanostructured silicon

Dr Pavlo Lishchuk (Taras Shevchenko National University of Kyiv)

11/7/24, 11:55 AM

Oral

Silicon nanowires have unique thermophysical and optical properties that suit various applications, including sensors, energy systems, and semiconductor industries. The optical properties of silicon nanowires can vary significantly depending on their synthesis method and the initial parameters of the crystalline material, both of which have a substantial impact on the resulting morphology....

99. Nonlinear plasmonic nanostructures for quadratic nonlinear optics

Prof. Isabelle Ledoux-Rak (Laboratoire Lumière, Matière et Interfaces, UMR 8537, Ecole Normale Supérieure Paris-Saclay, CentraleSupélec, CNRS, Université Paris-Saclay, 91190 Gif-sur-Yvette, France)

11/7/24, 1:00 PM

Invited Talk

We report the quadratic nonlinear optical responses of noble metal nanoparticles with various size and shapes, and their corresponding hyperpolarizability β values as measured via the Harmonic Light Scattering technique at 1.064 µm.
First we investigate the influence of surface area of gold and silver nanospheres and nanorods on their β values, and explore the validity limit of their purely...

26. Stimulated Raman scattering microscopy: theory and applications

Dr Vasyl Shynkar (HORIBA Scientific)

11/7/24, 1:30 PM

Oral

Since its discovery in 1928, Raman spectroscopy has become a powerful tool for molecular identification due to its ability to detect molecular fingerprints. It is widely applied in various fields such as pharmacology, food analysis, and mineralogy. The integration of Raman spectroscopy with optical microscopy has advanced hyper-spectral imaging, enabling detailed spectral acquisition within...

41. Dependence of the random lasing threshold and spectrum of dyes on the parameters of the active scattering medium

Dr Andrii Smaliuk (Taras Shevchenko National University of Kyiv)

11/7/24, 2:00 PM

Oral

In multiply scattering media, there is the possibility of light lasing without optical resonator. This phenomenon is possible due to the formation of positive feedback resulting from the repeated extension of the path of a scattered photon in the active region and called random lasing.
The main parameters that influence the occurrence of random lasing in the active medium are: the...

65. About the possibility of visualizing scattering areas of a medium using random lasing

Mr Michael Zhuravsky (Taras Shevchenko National University of Kyiv)

11/7/24, 2:15 PM

Oral

This work investigates random lasing (RL) in confined clusters of strongly scattering media using Monte Carlo method (MCM). The study include calculations of the photon distribution for both pumping and RL within such clusters, as well as the visualization of media containing these clusters.

The MCM demonstrates that the maximum photon density of RL is concentrated at the center of the...

76. Peculiarities of forced radiation formation in thin dyed hybrid organic-inorganic films

Mr Artem Podshebiakin (Taras Shevchenko National University of Kyiv)

11/7/24, 2:30 PM

Oral

The development of integrated optoelectronics requires the creation of lasers with minimum sizes which would be acceptable for integration into the corresponding optoelectronic circuits. The most suitable for this purpose are waveguide planar lasers, which are integrated with waveguides and other devices of the optoelectronic circuit. At present, most attention is paid to films based on rare...

14. Transitioning from Manual to Automated Control: Mode-Locked Ultra-Fast Fiber Lasers via Machine Learning and Genetic Algorithms

MUHAMMAD HAMZA YOUNES (SHENZHEN UNIVERSITY)

11/7/24, 2:45 PM

Oral

Mid or Near-IR Mode-Locked Lasers offer several advantages over simple Continuous-Wave (CW) Lasers due to their unique operational characteristics and significant commercial applications. Mode-locked lasers typically generate ultra-short and ultra-fast pulses with very high peak powers and repetition frequencies, which are essential for a wide range of applications such as nonlinear optical...