Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals
Lithium triborate (LiB3O5, LBO) crystal is now one of the most useful nonlinear optical materials for frequency conversion of high power lasers. The use of the crystal, however, has been hampered by the unavailability of antireflective (AR) coatings with high laser damage resistance. In this work, a...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2016-04-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4947135 |
| _version_ | 1818009518034911232 |
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| author | Bingtao Tian Xiaodong Wang Yanyan Niu Jinlong Zhang Qinghua Zhang Zhihua Zhang Guangming Wu Bin Zhou Jun Shen |
| author_facet | Bingtao Tian Xiaodong Wang Yanyan Niu Jinlong Zhang Qinghua Zhang Zhihua Zhang Guangming Wu Bin Zhou Jun Shen |
| author_sort | Bingtao Tian |
| collection | DOAJ |
| description | Lithium triborate (LiB3O5, LBO) crystal is now one of the most useful nonlinear optical materials for frequency conversion of high power lasers. The use of the crystal, however, has been hampered by the unavailability of antireflective (AR) coatings with high laser damage resistance. In this work, a “point contact” dip-coating method is developed to prepare sol–gel SiO2 AR coatings on small-size LBO crystals. Using this approach, we obtain a homogenous coating surface on an 8 mm×8 mm×3 mm LBO crystal. The stress measurements show that the stresses in sol–gel SiO2 coatings vary with the time of natural drying, which is beyond our expectation. The anisotropic Young’s modulus of the LBO crystal and the different evolution tendency of the stress in the different SiO2 coating layers are found to be responsible for the crack of the double-layer AR coatings on anisotropic LBO crystal. Meanwhile, the resulting coatings on LBO crystal achieve a LIDT of over 15 J/cm2 (532 nm, 3ns) and the coated LBO is expected to have a transmittance of over 99% at 800 nm. |
| first_indexed | 2024-04-14T05:43:45Z |
| format | Article |
| id | doaj.art-4085b65bcf6e4ad0a2dbfee29e270c0c |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-14T05:43:45Z |
| publishDate | 2016-04-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-4085b65bcf6e4ad0a2dbfee29e270c0c2022-12-22T02:09:21ZengAIP Publishing LLCAIP Advances2158-32262016-04-0164045208045208-1010.1063/1.4947135034604ADVPreparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystalsBingtao Tian0Xiaodong Wang1Yanyan Niu2Jinlong Zhang3Qinghua Zhang4Zhihua Zhang5Guangming Wu6Bin Zhou7Jun Shen8Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. ChinaShanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. ChinaShanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. ChinaSchool of Physics Science and Engineering, Tongji University, Shanghai, 200092, P. R. ChinaChengdu Fine Optical Engineering Research Center, Chengdu, 610041, P. R. ChinaShanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. ChinaShanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. ChinaShanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. ChinaShanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. ChinaLithium triborate (LiB3O5, LBO) crystal is now one of the most useful nonlinear optical materials for frequency conversion of high power lasers. The use of the crystal, however, has been hampered by the unavailability of antireflective (AR) coatings with high laser damage resistance. In this work, a “point contact” dip-coating method is developed to prepare sol–gel SiO2 AR coatings on small-size LBO crystals. Using this approach, we obtain a homogenous coating surface on an 8 mm×8 mm×3 mm LBO crystal. The stress measurements show that the stresses in sol–gel SiO2 coatings vary with the time of natural drying, which is beyond our expectation. The anisotropic Young’s modulus of the LBO crystal and the different evolution tendency of the stress in the different SiO2 coating layers are found to be responsible for the crack of the double-layer AR coatings on anisotropic LBO crystal. Meanwhile, the resulting coatings on LBO crystal achieve a LIDT of over 15 J/cm2 (532 nm, 3ns) and the coated LBO is expected to have a transmittance of over 99% at 800 nm.http://dx.doi.org/10.1063/1.4947135 |
| spellingShingle | Bingtao Tian Xiaodong Wang Yanyan Niu Jinlong Zhang Qinghua Zhang Zhihua Zhang Guangming Wu Bin Zhou Jun Shen Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals AIP Advances |
| title | Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals |
| title_full | Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals |
| title_fullStr | Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals |
| title_full_unstemmed | Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals |
| title_short | Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals |
| title_sort | preparation and stress evolution of sol gel sio2 antireflective coatings for small size anisotropic lithium triborate crystals |
| url | http://dx.doi.org/10.1063/1.4947135 |
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