Belęšė holografijos sistema žadinimo zondavimo eksperimentuose /

From ancient times, light has captivated human imagination. While ancient Greeks attributed supernatural properties to light phenomena, modern advancements in technology allow us to explore light as an electromagnetic wave with far greater precision. The ability to capture and interpret information carried by light beams enables the study of objects at astronomical distances and nanoscale structures. One pivotal advancement in this field was the development of holography by Dennis Gabor in 1948, which revolutionized three-dimensional imaging using coherent light sources. Despite its significance, traditional holography faced limitations due to cumbersome optical systems and analog data recording challenges. In recent years, digital holography has emerged, leveraging digital sensors and image reconstruction algorithms to overcome many of the traditional limitations [3]. This thesis focuses on the construction and application of a lensless digital holography system designed for pump-probe experiments. By removing the lens from the imaging system, we achieved a compact and versatile setup. The developed system not only demonstrated high spatial resolution (8 𝜇m) and reduced phase noise but also proved effective in accurately capturing dynamic processes. The achieved differential phase stability with a mean standard deviation of 5.9 mrad, was sufficient to observe Kerr effect and refractive index changes induced by excitons and free electron plasma. The constructed lensless holography system offers significant potential for further development and application across various experimental conditions. Its enhanced phase stability suggests that with further improvements, the system could observe dynamic processes that are challenging to register with conventional holography, such as shock waves in solid state bodies, ferroelectric domain switching, and the formation of color centers. This versatility and compact design make it a valuable tool for both scientific research and industrial applications, paving the way for innovative advancements in imaging technologies.

Grantor dc:publisher

Institutional Repository of Vilnius University

Year dc:date

2024

Author dc:creator

• Eimutis, Nikolajus Elkana,

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

lit

Repository record dc:identifier

https://repository.vu.lt/VU:ELABAETD210580034&prefLang=en_US

OAI identifier oai:identifier

oai:vu.lt:elaba:210580034