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    • Keywords


      Sol–gel dip coating; dielectric metal oxide; multi-layer optical coating; anti-reflection coating; laser-induced damage threshold.

    • Abstract


      In order to obtain higher laser-induced damage threshold (LIDT) and lower loss of laser radiation, the incident radiation must have an insignificant absorbance and high anti-reflectance. In this work, a single-layer porous SiO$_2$-based anti-reflective (AR) coating for the optics of Nd:phosphate laser system has been developed on quartz glass optics adopting sol–gel dip coating technique, following quarter wavelength optical design. As measured by spectroscopic ellipsometer, the refractive index (RI) of the coated layer is found to be ${\sim}$1.2. A maximum transmittance of ${\sim}$99% in single-layer-coated quartz glass has been achieved at 1054 nm. In addition, the non-quarter wavelength-based doublelayer with an optical design (glass/ 0.7153 M / 1.134 L / air) and triple-layer AR coating with an optical design (glass / 0.28 H / 1.65 M / 1.03 L / air, where H, M and L indicate one-quarter wave thick layers of high, medium and low RI materials) have been fabricated. The deposition of M and H layers has been made from mixed metal oxide precursor sols of zirconia-silica, while L has been made from silica precursor sol to obtain porous silica coating. A maximum transmittance of about 98.1 and 97.6% was found at 1054 nm in double- and triple-layer AR-coated samples, respectively. The LIDT values have been measured on the AR coatings. Based upon the number of layers in the AR coatings, the LIDT values varied in the range of 8.7–2.4 J cm$^{–2}$ starting from single to double to triple layer. The AR coatings developed by sol–gel dip coating technique could find application in Nd:phosphate high power laser system.

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    • Author Affiliations



      1. Specialty Glass Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India
      2. Laser Technology Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India
      3. Homi Bhabha National Institute, Training School Complex, Mumbai 400094, India
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    • Supplementary Material

  • Bulletin of Materials Science | News

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