Colored object recognition by digital holography and a hydrogen Raman shifter

Percival Almoro; Wilson Garcia; Caesar Saloma

doi:10.1364/OE.15.007176

Optics Express
Vol. 15,
Issue 12,
pp. 7176-7181
(2007)
•https://doi.org/10.1364/OE.15.007176

Colored object recognition by digital holography and a hydrogen Raman shifter

Percival Almoro, Wilson Garcia, and Caesar Saloma

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Percival Almoro, Wilson Garcia, and Caesar Saloma, "Colored object recognition by digital holography and a hydrogen Raman shifter," Opt. Express 15, 7176-7181 (2007)

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Abstract

Multi-wavelength holography is demonstrated with a H₂ Raman shifter that is pumped with an elliptically-polarized pulsed 532 nm beam to produce temporally coherent, intense, polarized output lines. Digital holograms of two-dimensional colored objects are recorded using Raman output lines at 630.4 nm (S₀₅, Red), 532 nm (Rayleigh, Green) and 435.7 nm (aS₁₀, Blue). Object reconstruction is done numerically via the convolution method and colored object recognition is achieved by multi-channel correlation of the Red, Green, and Blue reconstructions of the reference and the target object.

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Fig. 1. Experimental setup: Pulsed Nd:YAG laser, λ/4 plate, lenses (L1, L2), Raman shifter, Pellin-Broca (PB) prism, beam blocks (BB), mirrors (M1-M3), collimator, beamsplitters (BS1 and BS2), neutral density filters (NDF), test object, CCD camera and computer (PC).

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Fig. 2. Colored test objects: (a) Reference and (b) Target. Object dimensions (mm): 1.5 × 3.5 × 0.3.

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Fig. 3. Colored object recognition. First row (top): a) R, (b) G, and (c) B reconstructions of reference object. Second row: (d) R, (e) G and (f) B reconstructions of target object. Third row: Autocorrelations of R (g), G (h) and B (i) reconstructions. Fourth row: (j), (k) and (l) are cross-correlations of R (j, C_max= 0.42), G (k, C_max=0) and B (l, C_max=0.72) reconstructions of the reference and target.

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Equations (4)

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U_{d} (ξ . η) = (\frac{1}{iλ}) \int \int I (x, y) r (x, y) (\frac{1}{ρ}) \exp (\frac{i 2 πρ}{λ}) dxdy

U_{d} (r, s) = F [I (k, l) \exp [(\frac{iπ}{λd}) (k^{2} Δ x^{2} + {l^{2} Δ y}^{2})]

U_{d} (r, s) = I (k, l) \otimes g (k, l) = F^{1} {F [I (k, l) F [g (k, l)]}

C = {∣ F^{- 1} {F [U_{r} (r, s)] F {[U_{t} (r, s)]}^{*}} ∣}^{2} = {∣ F^{- 1} {F [I_{r} (x, y)] F {[I_{t} (x, y)]}^{*} {∣ F [g (k, l) ∣}^{2}} ∣}^{2}

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