Efficient pump-probe sampling with a single-cavity dual-comb laser: Application in ultrafast photoacoustics

Autor:	Pupeikis, Justinas, Hu, Wenxiang, Willenberg, Benjamin, Mehendale, Manjusha, Antonelli, George Andrew, Phillips, Christopher, Keller, Ursula
Rok vydání:	2023
Předmět:	Time-resolved Brillouin oscillations Time domain thermoreflectance Non-destructive testing Pump-probe microscopy Radiology Nuclear Medicine and imaging Picosecond ultrasonics Ultrafast pump-probe TDTR Thin-film layer thickness measurements Atomic and Molecular Physics and Optics
Zdroj:	Photoacoustics, 29
ISSN:	2213-5979
DOI:	10.1016/j.pacs.2022.100439
Popis:	Ultrafast pump-probe measurements are used to characterize various samples, such as biological cells, bulk, and thin-film structures. However, typical implementations of the pump-probe apparatus are either slow or complex and costly hindering wide deployment. Here we combine a single-cavity dual-comb laser with a simple experimental setup to obtain pump-probe measurements with ultra-high sensitivity, fast acquisition, and high timing precision over long optical delay scan ranges of 12.5 ns that would correspond to a mechanical delay of about 3.75 m. We employ digital signal balancing to obtain shot-noise-limited detection compatible with pump-probe microscopy deployment. Here we demonstrate ultrafast photoacoustics for thin-film sample characterization. We measured a tungsten layer thickness of (700 ± 4) Å with shot-noise-limited detection. Such single-cavity dual-comb lasers can be used for any pump-probe measurements and are especially well-suited for ultrafast photoacoustic studies such as involving ultrasonic echoes, Brillouin oscillations, surface acoustic waves and thermal dynamics. Photoacoustics, 29 ISSN:2213-5979
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88b1f8719127bd9152025b60e0f59b35 https://doi.org/10.1016/j.pacs.2022.100439 Zobrazit plný text záznamu