Nano-indentation and laser-induced damage testing in optical multilayer-dielectric gratings

Effect of electric field on laser induced damage threshold of multilayer dielectric gratings.

This paper studies gratings engraved in multilayer dielectric stacks for ultra high intensity laser compressors application. We design various grating profiles with high reflected efficiencies for 1780 l/mm multilayer dielectric gratings (MLD). Each grating is defined to exhibit a different electric field maximum value in the pillars of the grating. A damage testing facility operating at 1.053 ...

High-Eff iciency, Dielectric Multilayer Gratings Optimized for Manufacturability and Laser Damage Threshold

CO2 laser induced long period gratings in optical microfibers.

Long period gratings (LPGs) are fabricated by use of focused high frequency CO(2) laser pulses to periodically modify the transverse dimension of silica microfibers. A 20-period LPG with a 27 dB attenuation dip is realized in a microfiber with a diameter of approximately 6.3 microm. The resonant wavelength has a negative temperature coefficient and a high sensitivity to external refractive inde...

Dielectric response of pentagonal defects in multilayer graphene nano-cones.

The dielectric response of pentagonal defects in multilayer graphene nano-cones has been studied by electron energy loss spectroscopy and ab initio simulations. At the cone apex, a strong modification of the dielectric response is observed below the energy of the π plasmon resonance. This is attributed to π → π* interband transitions induced by topology-specific resonant π bonding states as wel...

Indentation-induced damage in GaN epilayers