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. 2018 Mar 11;10(3):302.
doi: 10.3390/polym10030302.

Holographic Lenses in an Environment-Friendly Photopolymer

Tomás Lloret  1 , Víctor Navarro-Fuster  2 , Manuel G Ramírez  3 , Manuel Ortuño  4 , Cristian Neipp  5 , Augusto Beléndez  6 , Inmaculada Pascual  7
Affiliations

Holographic Lenses in an Environment-Friendly Photopolymer

Tomás Lloret et al. Polymers (Basel). .

Abstract

In this paper, we theoretically and experimentally evaluated the quality of volume phase transmission lenses stored in an environmentally friendly photopolymer. Holographic lenses (HLs) were obtained using symmetrical and asymmetrical experimental setups with the same positive and negative focal length and pupil diameter. The image quality was evaluated from the calculation of the modulation transfer function (MTF) by capturing the point spread function (PSF) with a charge-coupled device (CCD). A maximum frequency of 14 L/mm, reaching an MTF value of 0.1, was obtained for a negative asymmetrically recorded HL, evaluated at 473 nm wavelength. A theoretical study of aberrations was carried out to qualitatively evaluate the experimental results obtained.

Keywords: environment-friendly photopolymer; holographic lenses; volume holography.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Chemical structures of the prepolymer components.
Figure 2
Figure 2
Experimental setup for recording of holographic lenses. S: electronic shutter, BS: beam-splitter, Mi: mirrors, Li: lenses, Di: diaphragms, SFi: spatial filters, RL: refractive lens, PL: photopolymer layer, Oi: optical power meters, PC: data recorder.
Figure 3
Figure 3
Experimental setup for the evaluation of holographic lenses. Fi: filters, SF: spatial filter, L: lens, D: diaphragm, HL: holographic lens, CCD: charge-coupled device.
Figure 4
Figure 4
Experimental modulation transfer function (MTFs) for positive and negative HLs recorded (a) asymmetrically and (b) symmetrically. The frequencies of the HLs were determined for an MTF value of 0.1 (black, horizontal line).
Figure 5
Figure 5
Total aberration (ΔTotal) at the exit pupil plane (PS) of asymmetrical (a,b), and symmetrical (c,d), HLs recorded (a,c) at 473 nm and (b,d) at 633 nm wavelength.
Figure 6
Figure 6
Intensity distribution at the image plane of asymmetrical (a,b), and symmetrical (c,d), HLs recorded (a,c) at 473 nm and (b,d) at 633 nm wavelength.
Figure 7
Figure 7
Intensity images of the HL lenses recorded (a) and (b) asymmetrically and (c,d) symmetrically, evaluating (a,c) at 473 nm and (b,d) at 633 nm.
Figure 8
Figure 8
Photography of two HLs daylight-illuminated.
See this image and copyright information in PMC

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