Design, fabrication and laser damage comparisons of low-dispersive mirrors

Ruiyi Chen; Yanzhi Wang; Kesheng Guo; Meiping Zhu; Kui Yi; Jianda Shao

doi:10.1117/12.2540824

8 July 2019 Design, fabrication and laser damage comparisons of low-dispersive mirrors

Ruiyi Chen, Yanzhi Wang, Kesheng Guo, Meiping Zhu, Kui Yi, Jianda Shao

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 110630F (2019) https://doi.org/10.1117/12.2540824
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

Abstract

Low dispersive with broad bandwidth mirrors serve as indispensable elements in ultrafast laser systems. We report on three coatings, quarter-wave high reflection mirror, metal-dielectric mirror and ternary composite mirror, which are suitable for broad bandwidth high reflection (BBHR) with 800nm center wavelength. Mirrors based on quarterwave Ta₂O₅/SiO₂ layers are designed and fabricated. By depositing the quarter-wave HfO₂/SiO₂ layers on the metallic material, we have achieved the mirror with lager low-dispersive bandwidth, this design takes advantage of broad high reflection bandwidth of metal and high laser induced damage threshold (LIDT) of HfO₂. Moreover, we have deposited HfO₂/SiO₂ layers on Ta₂O₅/SiO₂ layers, since HfO₂ demonstrates higher damage threshold than Ta₂O₅, such combination reach an ideal trade-off between the low-dispersive bandwidth and high LIDT comparing with traditional quarter-wave Ta₂O₅/SiO₂ layers. Our BBHR mirrors are produced by means of dual-ion-beam sputtering technique. The designs afford low group delay dispersion (GDD) for reflected light over the broad bandwidth in order to minimize temporal broadening of the fs pulses. The design’s GDD behaves in a smooth way, and its electric field intensities show promise for high LIDTs. Reflectivity and GDD measurements indicate good performance of the BBHR design. LIDTs of the produced BBHR mirrors are also tested and compared.

Citation Download Citation

Ruiyi Chen, Yanzhi Wang, Kesheng Guo, Meiping Zhu, Kui Yi, and Jianda Shao "Design, fabrication and laser damage comparisons of low-dispersive mirrors", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110630F (8 July 2019); https://doi.org/10.1117/12.2540824

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