|
ИСТИНА |
Войти в систему Регистрация |
ФНКЦ РР |
||
Role of wavelength in photocarrier absorption and plasma formation threshold under excitation of dielectrics by high-intensity laser field tunable from visible to mid-IRстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 7 октября 2020 г.
- Авторы: Migal Ekaterina, Mareev Evgeny, Smetanina Evgeniya, Duchateau Guillaume, Potemkin Fedor
- Журнал: Scientific reports
- Том: 10
- Год издания: 2020
- Издательство: Nature Publishing Group
- Местоположение издательства: United Kingdom
- Первая страница: 1
- Последняя страница: 10
- Номер статьи: 14007
- DOI: 10.1038/s41598-020-70862-w
- Аннотация: The development of high power mid-IR laser applications requires a study on laser-induced damage threshold (LIDT) in the mid-IR. In this paper, we have measured the wavelength dependence of the plasma formation threshold (PFT) that is LIDT precursor. In order to interpret the observed trends numerically, a model describing the laser-induced electron dynamics, based on multiple rate equations, has been developed. We show both theoretically and experimentally that PFT at mid-IR wavelengths is controlled by a transition from weak- to strong-field regime of free carrier absorption. In the case of MgF2, this transition occurs around 3 - 4 um corresponding to the region of the lowermost PFT. The region of the uppermost PFT is reached around 1 um and is governed by an interplay of photoionization and weak-field free carrier absorption which manifests itself in both MgF2 and SiO2. The PFT observed in considered materials exhibits a universal dependence on the excitation wavelength in dielectrics. Thus, the presented results pave the route towards efficient and controllable laser-induced material modifications and should be of direct interest to laser researchers and application engineers for the prevention of laser-induced damage of optical components in high-intensity mid-IR laser systems.
- Добавил в систему: Потёмкин Фёдор Викторович