Laser damage threshold and optical absorption of KDP crystal dependent on their growth conditions

Притула, И. М.; Puzikov, V. M.; Salo, Vitaly I.; Kolybayeva, Marina I.; Garnov, S. V.; Voznyi, Vladimir L.

doi:10.1117/12.344376

Cited by 2 publications

(1 citation statement)

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“…The transmittance at 527 nm reaches 99.3%, wherea that at 1053 nm is only 97.5%, which is due to 1053 nm is close to the infrared absorption edge of the KDP crystals. 2,30 As can be noticed, there are small deviations between the experimental and theoretical transmittance spectra in the short and long wavelength regions, which are attributed to the extinction coefficients of the KDP substrate are difficult to be determined accurately for simulation, as well as the deviation of coating thickness from the theoretical design. To clearly see the interface, the same double-layer coating was deposited on a Si wafer and the cross-section was presputtered with gold to improve the poor conductivity of coating materials for SEM observation.…”

Section: Surface Morphology and Opticalmentioning

confidence: 99%

Sol–Gel Preparation of Laser Damage Resistant and Moisture-Proof Antireflective Coatings for KDP Crystals

et al. 2018

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Surface fogging induced degradation has been a bottleneck problem in potassium dihydrogen phosphate (KDP) crystals due to they are grown from aqueous solution. In this paper, we developed a facile method to prepare a double-layer antireflective coating with moisture-proof and laser damage resistant properties for KDP crystals. The bottom layer was a poly siloxane coating with dense structure and silanol side groups, while the top layer was a hexamethyl-disilazane (HMDS) modified nanoporous SiO coating. Both of the sols were nonalkaline and nonaqueous to make sure those are harmless to KDP crystals. The double-layer coated KDP crystal exhibited a maximum transmittance of 99.9% with an average increase of transmitted light of 6-7% over the wavelength range between 351 and 1053 nm. After exposure in a 55% relative humidity environment for 6 months, the double-layer HMDS_SiO/PS coating coated KDP crystal displayed nearly the same optical transmittance as the original one, whereas the single-layer HMDS_SiO coated KDP crystal had a transmittance loss of ∼5%. Moreover, the laser-induced damage threshold of the double-layer coating on KDP crystal reached 11.5 J/cm (355 nm, 3 ns). This multifunctional antireflective coating not only can be used for KDP crystals, but also can be applied to thermal-sensitive polymeric substrates.

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Section: Surface Morphology and Opticalmentioning

confidence: 99%