Event 

Title:
Seminars at the Accelerator - Recent results in ion beam fabrication of optical elements
When:
20.12.2011 - 20.12.2011
Where:
CMAM - Madrid
Category:
Informal seminars at the Accelerator

Description

Speaker: István Bányász, Reserach Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Budapest (Hungary)

Recent results in ion beam fabrication of optical elements

  1. Barrier-type planar optical waveguides operating up to the telecommunication wavelength of 1550 nm in an Er-doped tungsten – tellurite glass have recently been designed and fabricated, using irradiation with N+ ions of 3.5 MeV energy. However, a large part of the guiding modes proved to be leaky, i.e. a considerable amount of light traversed the barrier layer. To overcome that problem two-energy irradiations were devised. In principle, applying two consecutive irradiations at different ion energies could eliminate leaky modes by producing a wider barrier layer. Preliminary results seem to confirm that assumption.
  2. An old idea of fabricating diffractive optical elements using ion beam irradiation has recently been revived. Instead of using photolithographic masks to define the grating structure, a proton microbeam at an energy of 1 MeV was used.  Transmission phase grating with grating constants ranging from 4 to 30 µm have been fabricated. Fluence across the individual grating lines was modulated so that to obtain quasi-sinusoidal refractive index profile. The proton beam irradiated gratings were studied by transmission and reflection interference phase contrast microsco

Venue

CMAM
Venue:
CMAM   -   Website
Street:
Faraday 3, Campus de Cantoblanco
ZIP:
28049
City:
Madrid
Country:
Country: es

Description

The seminar takes place at the meeting room of the CMAM