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In situ thermal characterisation and filamentary modification in Polymethylpentene

Liu, B, Wang, X, Torres, JA, He, T, Zhou, H, Zhao, H, Zeng, C, Ma, L, Chen, X and Zhu, G (2023) In situ thermal characterisation and filamentary modification in Polymethylpentene. Infrared Physics & Technology, 130. ISSN 1350-4495

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Open Access URL: https://doi.org/10.1016/j.infrared.2023.104636 (Published version)


Polymethylpentene (PMP) polymers can be used to make advanced optics, especially for midinfrared (MIR) ultrafast optics. In this study, an optical parametric converter pumped by a Ti sapphire femtosecond laser was used to investigate the polymer. The thermal effect generated by loosely focused femtosecond near mid-infrared (MIR) pulses in bulky materials is observed in real-time, and the polymer exhibits thermal stability and conformability. To avoid strong linear absorption and to increase the nonlinear damage threshold, the spectral region for ultrafast applications is 1310 nm (0.95 eV)–1350 nm (0.92 eV). For the process in region VI, there is a sign of stronger coupling for short-wavelength photons, and the pulse duration is recommended to be lower than 160 fs. In the ultraviolet (UV) region, filamentary writing using a low-focused beam, the laser peak power was selected in the range of 2.2 MW–9.2 MW. High-density bulky gratings were written. The refractive-index modulation was significant, and the polymer exhibited highly nonlinear features. This study provides insights into the applications and production of PMP polymers in laser optics and laser engineering.

Item Type: Article
Uncontrolled Keywords: 0204 Condensed Matter Physics; 0205 Optical Physics; 0915 Interdisciplinary Engineering; Applied Physics
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Engineering
Publisher: Elsevier
SWORD Depositor: A Symplectic
Date Deposited: 09 Mar 2023 09:53
Last Modified: 09 Mar 2023 10:00
DOI or ID number: 10.1016/j.infrared.2023.104636
URI: https://researchonline.ljmu.ac.uk/id/eprint/19054
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