Local variations of the index of refraction of a Bi, Al-doped garnet film by laser annealing

Journal Article · Fri Nov 15 00:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349968· OSTI ID:5061805

Stashkevich, A A ^[1]; Gouzerh, J; Ben Youssef, J ^[2]

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1. Ulyanov (Lenin) Institute of Electrical Engineering, 197022, Leningrad (USSR)
2. CNRS, L.M.M.M., 92195 Meudon (France)

The purpose of this paper is to understand the influence of laser annealing on the index of refraction of Al-doped ferrimagnetic garnet films in the near-infrared domain. It has been shown recently that a similar effect takes place in Ga-doped garnet films. According to theoretical predictions based on the photoelastic origin of the changes of the properties of a film after the local heat treatment, the effect of the variation of the index of refraction in Al-doped films should be several times greater than in the case of Ga-doped films. The experiment was carried out on Y{sub 1.73}Bi{sub 1.23}Fe{sub 3.69}Al{sub 1.31}O{sub 12} films. Phase diffraction gratings were fabricated in the films by means of laser annealing and thus a diffraction pattern of optical waveguide modes was analyzed with a photodetector. It has been shown that variations of the index of refraction as great as 10{sup {minus}3} were achieved. Thus it was demonstrated that the investigated effect is much stronger in Al-doped films compared to Ga-doped films. As in Ga-doped films, the dependence of the efficiency of diffraction on the number of an optical waveguide mode has been observed. That confirms the idea that the local value of the film thickness is changed as a consequence of the variation of the lattice parameter by heat treatment.

• OSTI ID: 5061805
• Journal Information: Journal of Applied Physics; (United States), Vol. 70:10; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
REFRACTIVITY
BISMUTH OXIDES
IRON OXIDES
THIN FILMS
YTTRIUM OXIDES
ALUMINIUM ADDITIONS
DIFFRACTION GRATINGS
DOPED MATERIALS
GARNETS
LASER-RADIATION HEATING
LATTICE PARAMETERS
NEAR INFRARED RADIATION
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
FILMS
GRATINGS
HEATING
INFRARED RADIATION
IRON COMPOUNDS
MATERIALS
MINERALS
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLASMA HEATING
RADIATIONS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360104* - Metals & Alloys- Physical Properties