Investigation in oxide mixture coatings with adapted gradient index profiles

Starke, K.; Jensen, Lars; Jupé, Marco; Ristau, Detlev; Abromavičius, Giedrius; Juškevičius, Kęstutis; Buzelis, Rytis; Drazdys, Ramutis

doi:10.1117/12.836462

Cited by 5 publications

(2 citation statements)

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“…Since the pure ZrO 2 material has increased absorption losses close to the resonance absorption edge (at 355 nm wavelength), we have used ZrO 2 -SiO 2 mixtures which allows one to shift that edge towards UV range and reduce absorption losses: the band-gap of the mixture materials is strongly varying with the content of SiO 2 . Previous investigations showed that by increasing the SiO 2 portion in the mixture up to 50%, a blue shift of the absorption edge of approximately 40 nm was observed [10]. On the other hand, content of ZrO 2 in the mixture cannot be too low, because it is necessary to have a sufficient contrast ratio of refractive indices of coating materials to achieve very low residual reflection <0.1% of the AR coating.…”

Section: Deposition Of Experimental Coatings and Lidt Measurementsmentioning

confidence: 99%

Optical resistance and spectral properties of anti-reflective coatings deposited on LBO crystals by ion beam sputtering

Abromavičius¹,

Buzelis²,

Drazdys³

et al. 2011

Lith. J. Phys.

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The nonlinear lBO (liB 3 O 5 ) crystal is widely used in many Nd : YAG, Yb : KGW and Nd : YlF lasers in order to generate higher optical harmonics. However, the most limiting factor in such applications is the optical resistance of their coated surfaces described by the so-called laser Induced Damage Threshold (lIDT) parameter. In this work we investigate the "fatigue" (multi-pulse) behaviour of lIDTs in lBO crystals coated with different types of (single AR@355 nm and triple AR@355+532+1064 nm wavelength) anti-reflective coatings while optimising the refractive index designs and selecting appropriate sub-layer materials. All the coatings were produced of different oxide materials (ZrO 2 , Al 2 O 3 , SiO 2 ) and ZrO 2 -SiO 2 mixtures by using the ion beam sputtering (IBS) deposition technique. The optical damage resistance of both fixed and transient refractive index coatings is of special interest. Besides the spectral properties, the resistance to laser irradiation is characterised at the wavelength of 355 nm with laser pulses of nanosecond duration. The conclusions are drawn about the AR coated lBO with the most successful designs by the means of optical resistance.

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Section: Deposition Of Experimental Coatings and Lidt Measurementsmentioning

confidence: 99%

Optical resistance and spectral properties of anti-reflective coatings deposited on LBO crystals by ion beam sputtering

Abromavičius¹,

Buzelis²,

Drazdys³

et al. 2011

Lith. J. Phys.

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show abstract

“…In laser optics applications, typically a stack design of periodically alternating low and high refractive index dielectric layers of λ/4 optical thickness is used [5,6]. However, rapid development of femtosecond laser technology requires much more complex coatings having more advanced design structures, in which the refractive index varies smoothly and periodically through the film depth [7][8][9].…”

Section: Introductionmentioning

confidence: 99%