Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser System
(1) Background: The modeling, characterization, and mitigation of transient lasers, thermal stress, and thermo-optic effects (TOEs) occurring inside high energy lasers have become hot research topics in laser physics over the past few decades. The physical sources of TOEs are the un-avoidable residu...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/7/4/94 |
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| author | Lukasz Gorajek Przemyslaw Gontar Jan Jabczynski Jozef Firak Marek Stefaniak Miroslaw Dabrowski Tomasz Orzanowski Piotr Trzaskawka Tomasz Sosnowski Krzysztof Firmanty Marcin Miczuga Jaroslaw Barela Krzysztof Kopczynski |
| author_facet | Lukasz Gorajek Przemyslaw Gontar Jan Jabczynski Jozef Firak Marek Stefaniak Miroslaw Dabrowski Tomasz Orzanowski Piotr Trzaskawka Tomasz Sosnowski Krzysztof Firmanty Marcin Miczuga Jaroslaw Barela Krzysztof Kopczynski |
| author_sort | Lukasz Gorajek |
| collection | DOAJ |
| description | (1) Background: The modeling, characterization, and mitigation of transient lasers, thermal stress, and thermo-optic effects (TOEs) occurring inside high energy lasers have become hot research topics in laser physics over the past few decades. The physical sources of TOEs are the un-avoidable residual absorption and scattering in the volume and on the surface of passive and active laser elements. Therefore, it is necessary to characterize and mitigate these effects in real laser systems under high-power operations. (2) Methods: The laboratory setup comprised a 10-kW continuous wave laser source with a changeable beam diameter, and dynamic registration of the transient temperature profiles was applied using an infrared camera. Modeling using COMSOL Multiphysics enabled matching of the surface and volume absorption coefficients to the experimental data of the temperature profiles. The beam quality was estimated from the known optical path differences (OPDs) occurring within the examined sample. (3) Results: The absorption loss coefficients of dielectric coatings were determined for the evaluation of several coating technologies. Additionally, OPDs for typical transmissive and reflective elements were determined. (4) Conclusions: The idea of dynamic self-compensation of transient TOEs using a tailored design of the considered transmissive and reflecting elements is proposed. |
| first_indexed | 2024-03-10T15:24:30Z |
| format | Article |
| id | doaj.art-4cb9537fef744d1aa4e9ae5592af3389 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-10T15:24:30Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-4cb9537fef744d1aa4e9ae5592af33892023-11-20T18:11:00ZengMDPI AGPhotonics2304-67322020-10-01749410.3390/photonics7040094Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser SystemLukasz Gorajek0Przemyslaw Gontar1Jan Jabczynski2Jozef Firak3Marek Stefaniak4Miroslaw Dabrowski5Tomasz Orzanowski6Piotr Trzaskawka7Tomasz Sosnowski8Krzysztof Firmanty9Marcin Miczuga10Jaroslaw Barela11Krzysztof Kopczynski12Institute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, ul gen. S. Kaliskiego 2, 00-908 Warsaw, Poland(1) Background: The modeling, characterization, and mitigation of transient lasers, thermal stress, and thermo-optic effects (TOEs) occurring inside high energy lasers have become hot research topics in laser physics over the past few decades. The physical sources of TOEs are the un-avoidable residual absorption and scattering in the volume and on the surface of passive and active laser elements. Therefore, it is necessary to characterize and mitigate these effects in real laser systems under high-power operations. (2) Methods: The laboratory setup comprised a 10-kW continuous wave laser source with a changeable beam diameter, and dynamic registration of the transient temperature profiles was applied using an infrared camera. Modeling using COMSOL Multiphysics enabled matching of the surface and volume absorption coefficients to the experimental data of the temperature profiles. The beam quality was estimated from the known optical path differences (OPDs) occurring within the examined sample. (3) Results: The absorption loss coefficients of dielectric coatings were determined for the evaluation of several coating technologies. Additionally, OPDs for typical transmissive and reflective elements were determined. (4) Conclusions: The idea of dynamic self-compensation of transient TOEs using a tailored design of the considered transmissive and reflecting elements is proposed.https://www.mdpi.com/2304-6732/7/4/94high-power laserslaser weaponthermal opticsoptical technologyabsorption lossesthermal imaging |
| spellingShingle | Lukasz Gorajek Przemyslaw Gontar Jan Jabczynski Jozef Firak Marek Stefaniak Miroslaw Dabrowski Tomasz Orzanowski Piotr Trzaskawka Tomasz Sosnowski Krzysztof Firmanty Marcin Miczuga Jaroslaw Barela Krzysztof Kopczynski Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser System Photonics high-power lasers laser weapon thermal optics optical technology absorption losses thermal imaging |
| title | Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser System |
| title_full | Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser System |
| title_fullStr | Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser System |
| title_full_unstemmed | Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser System |
| title_short | Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser System |
| title_sort | characterization of absorption losses and transient thermo optic effects in a high power laser system |
| topic | high-power lasers laser weapon thermal optics optical technology absorption losses thermal imaging |
| url | https://www.mdpi.com/2304-6732/7/4/94 |
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