Improving the holographic sensitivity of dichromated gelatin in the blue–green part of the spectrum by sensitization with xanthene dyes

Dejan Pantelić; Branka Murić

doi:10.1364/AO.40.002871

Applied Optics
Vol. 40,
Issue 17,
pp. 2871-2875
(2001)
•https://doi.org/10.1364/AO.40.002871

Improving the holographic sensitivity of dichromated gelatin in the blue–green part of the spectrum by sensitization with xanthene dyes

Dejan Pantelić and Branka Murić

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Dejan Pantelić and Branka Murić, "Improving the holographic sensitivity of dichromated gelatin in the blue–green part of the spectrum by sensitization with xanthene dyes," Appl. Opt. 40, 2871-2875 (2001)

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Abstract

The holographic properties of dichromated gelatin (DCG) sensitized with various xanthene dyes were studied, and results are reported. The sensitivity of dyed DCG in the green part of the spectrum compared with that of pure DCG (215 mJ/cm²) was significantly improved by addition of Rhodamine 6G (140 mJ/cm²) or Erythrosin B (90 mJ/cm²). Diffraction gratings were recorded with a He–Ne laser at 543.5 nm. The maximum diffraction efficiency was found to be 32% at normal incidence of the readout beam; it was 80% at the Bragg angle.

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Step	Description
1.	Swell gelatin in deionized water for 60 min.
2.	Heat the suspension in a thermostated water bath at 50 °C, stirring for 10 min.
3.	Add an adequate amount (see text) of ammonium dichromate, by weight of dry gelatin, and heat in a thermostated water bath at 50 °C, stirring for 10 min.
4.	Add an appropriate amount of xanthene dye (see Fig. 3 below for the optimum value) to the DCG solution.
5.	Pipette out a known volume of dyed DCG solution onto a leveled glass microscope plate.
6.	Dry the plate overnight.

Step	Description
1.	Wash in water for 5 min.
2.	Dehydrate in a 50:50% isopropyl alcohol and water solution, stirring for 3 min.
3.	Dehydrate in a 70:30% isopropyl alcohol and water solution, stirring for 3 min.
4.	Dehydrate in 100% isopropyl alcohol for 1.5 min.
5.	Dry plate with flowing hot air for 5 min and then in a chamber containing a desiccant.

Step	Description
1.	Swell gelatin in deionized water for 60 min.
2.	Heat the suspension in a thermostated water bath at 50 °C, stirring for 10 min.
3.	Add an adequate amount (see text) of ammonium dichromate, by weight of dry gelatin, and heat in a thermostated water bath at 50 °C, stirring for 10 min.
4.	Add an appropriate amount of xanthene dye (see Fig. 3 below for the optimum value) to the DCG solution.
5.	Pipette out a known volume of dyed DCG solution onto a leveled glass microscope plate.
6.	Dry the plate overnight.

Step	Description
1.	Wash in water for 5 min.
2.	Dehydrate in a 50:50% isopropyl alcohol and water solution, stirring for 3 min.
3.	Dehydrate in a 70:30% isopropyl alcohol and water solution, stirring for 3 min.
4.	Dehydrate in 100% isopropyl alcohol for 1.5 min.
5.	Dry plate with flowing hot air for 5 min and then in a chamber containing a desiccant.

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