Geola Photopolymer GP3C
Geola photopolymer GP3C is a light-sensitive, self-developing photopolymer film which can be used to produce phase holograms in the form of volume reflection and volume transmission holograms. Photopolymer can be recorded with appropriate CW or pulsed laser light within the visible spectral wavelength range from 440 nm up to 680 nm. For hologram formation no further post-treatment is necessary, e.g. neither wet nor thermal treatment.
Geola photopolymer GP3C is a light-sensitive, self-developing photopolymer film which can be used to produce phase holograms in the form of volume reflection and volume transmission holograms. Photopolymer can be recorded with appropriate CW or pulsed laser light within the visible spectral wavelength range from 440 nm up to 680 nm. For hologram formation no further post-treatment is necessary, e.g. neither wet nor thermal treatment.
The substrate is a cellulose triacetate film (TAC), and the protective cover is a polyethylene film (PE). The protective cover film can be removed from the photopolymer.
Layer stack, schematic
Transmissions spectrum of the unrecorded photopolymer film
Approximate laser pulse dosage:
| λ = 633 nm | approx. 15 mJ/cm² |
| λ = 532 nm | approx. 20 mJ/cm² |
| λ = 457 nm | approx. 25 mJ/cm² |
General information for flood cure and bleaching:
Example: Conditions for mercury lamps
- Photopolymer layer on substrate laminated to glass
- Dosage: 5,000-10,000 mJ/cm²
- Intensity at the sample: 40 mW/cm²
Given cure and bleaching exposition parameters are just recommendations and should serve as guidelines.
High temperatures (above 60°C at the film) should be avoided because they can lead to deformation of the substrate.
General information about handling instructions under dark room conditions:
The product is light sensitive. Exposure to light prior to the holographic exposure might sacrifice the refractive index modulation Δn1 and diffraction efficiency η. Exposure can be calculated using our Online Exposure Calculator. Examples for tolerable expositions in dark room environment (dim yellow light) without sacrificing the holographic performance are given below:
| Property | Value | Unit of measurement | Method |
| Maximum exposure intensity | 2.6 1) | µW/cm² |
Photopolymer film Laminated, positioned at 30cm distance |
| 0.8 2) | µW/cm² | ||
| Maximum exposure time | 5 1) | min | |
| 30 2) | min |
1) Illuminant: OSRAM PARATHOM DECO CLASSIC A Yellow 1 Watt LED E27
2) Illuminant: PHILIPS AccentColor Miniglobe Yellow 1 Watt LED E27
Storage conditions
The unrecorded photopolymer film should be stored in the original and sealed container that is used for delivery, whenever possible. Storage temperature shall be kept at >150C and <250C.
While the recorded film is quite stable, the unrecorded photopolymer film should be protected from light, humidity, heat and foreign materials.
Safety
While there are no specific toxic threats, photopolymer film is a trial product that has not yet been fully tested. As such, safety precautions should be taken during its handling and use. Precautions should be taken to avoid direct contact of the unrecorded photopolymer with skin – gloves or other suitable personal protection devices should be used.
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