Compact and self-aligned all-optical image correlator based on third-harmonic generation

Tseng, Shuo Yen; Fuentes-Hernández, Canek; Kippelen, Bernard

doi:10.1364/ol.32.002599

Cited by 5 publications

(7 citation statements)

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“…These experiments were implemented in a compact joint-transform correlator geometry [37] that uses a diffractive optical element (DOE) beam-splitter to generate the beams to encode the 2D images used as the impulse response h(r), object g(r), and reconstruction g(r) functions. The DOE assures the spatial and temporal overlap of the fs pulses in the nonlinear medium.…”

Section: Methodsmentioning

confidence: 99%

“…For the imaging experiments, 1 mm diameter circular apertures encoded the beams used as the impulse response, h(r), and reconstruction, r(r), functions. [37] The letter characters, approximately 3.5 mm Â 3.5 mm in size, comprising the word ''GATECH'' were sequentially encoded onto the object beam g(r). The DFWM signal, which is proportional to the convolution, rðrÞ hðrÞ gðrÞ j j 2 , [38] was then captured at Table 1.…”

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confidence: 99%

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Thick Optical‐Quality Films of Substituted Polyacetylenes with Large, Ultrafast Third‐Order Nonlinearities and Application to Image Correlation

et al. 2008

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Processable organic materials with large, ultrafast thirdorder susceptibilities, x (3) , could enable all-optical signal processing (AOSP) applications through either fabrication of large-area thick films or integration into hybrid organic/ silicon photonic devices. [1][2][3][4] Conjugated polymers, such as polyacetylene, have been shown to exhibit large optical nonlinearities upon application of intense electromagnetic fields.[3] Despite these nonlinearities, many conjugated polymers are inadequate for photonic applications because they lack sufficient processability, or form films with significant crystallinity [5] or inhomogeneous morphologies [6] resulting in poor optical quality. For example, although films of unsubstituted polyacetylene have been found to possess large third-order susceptibilities, [7][8][9] they also exhibit extensive crystallinity, [10] resulting in poor optical quality and large scattering losses.[11] A more processable soluble diester polyacetylene derivative has been reported; [2] however, only thin films have been produced from this material and the bulky side groups can be anticipated to lead to a reduced nonlinear response through a dilution effect. The diester polyacetylene was successfully used in an image-correlation application performed using degenerate four-wave mixing (DFWM) in the visible region with resonant excitation, although the diffraction efficiency was relatively low, due mainly to the limited interaction length. Ring-opening metathesis polymerization (ROMP) provides for the facile synthesis of a great variety of unsaturated polymers.[12] The ROMP method (Scheme 1) utilizes an organometallic alkylidene-based initiator (e.g., rutheniumbased Grubbs initiators [13][14][15] or four-coordinate tungsten-and molybdenum-based Schrock initiators [16][17][18] ) to polymerize strained-ring olefin monomers. [6,19] The ROMP process allows for in situ polymerization of liquid-phase monomers, which allows facile processing of neat films [11] as well as potential integration of the resulting polymers into micro-or nanostructured photonic devices. Moreover, this method is amenable to independent optimization of monomers and initiators to improve processing conditions, optical quality of films, and the third-order susceptibility of the resulting conjugated polymers.Here we report on the synthesis, processing, and linear and nonlinear optical characterization of substituted polyacetylenes obtained using ROMP of mono-substituted cyclooctatetraene (R-COT) monomers. Polymerization and processing conditions have been developed that have led to thick (2-200 mm), large-area (>1 cm Â 1 cm) films possessing large third-order nonlinearities in the near-infrared (NIR) region including the telecommunications bands. The good optical quality of a 200 mm thick poly(n-butyl-COT) film allowed for DFWM image correlation under off-resonant excitation to be performed with improved diffraction efficiency relative to that obtained using the diester polyacetylene derivative mentioned above; the resulting di...

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Section: Methodsmentioning

confidence: 99%

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Thick Optical‐Quality Films of Substituted Polyacetylenes with Large, Ultrafast Third‐Order Nonlinearities and Application to Image Correlation

et al. 2008

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“…A detailed description of this setup can be found in Ref. 11. Transmission binary masks printed on overhead transparencies were used as images to modulate the input beams.…”

Section: ͑2͒mentioning

confidence: 99%

“…In contrast with the previously proposed ultrafast optical image processors that use a Kerr media in a phase-conjugated geometry, 1 the forward-folded crossed-beam phase-matched coherent antiStokes Raman spectroscopy ͑BOXCARS͒ geometry used for the noncollinear THG process can be implemented in a very compact setup using a diffractive optical element ͑DOE͒ to generate the input beams and assure their spatial and temporal overlap. 11 Even though the BOXCARS geometry has been used in the past for degenerate four-wave mixing ͑DFWM͒ imaging experiments, 12 the THG correlator produces signal outputs that are nondegenerate, backgroundfree, and spatially separated in the visible spectral range. Thus, they can be spatially filtered with an iris and are not affected by scattering at the fundamental wavelength.…”

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Ultrafast optical image processing based on third-harmonic generation in organic thin films

Fuentes-Hernández

Tseng

Owens

et al. 2007

Applied Physics Letters

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We report on the use of the noncollinear third-harmonic generation in an amorphous polymer film operating in the eye safe and telecommunication compatible near-infrared range to perform ultrafast all-optical two-dimensional (2D) image processing at 1550nm using 100fs pulses. The background-free and nondegenerate outputs at 517nm are easily spatially filtered and detected with low cost electronic components. We describe this Fourier transform based technique and demonstrate its application to the classical problem of 2D image recognition.

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“…The generation of nonlinear effects with high efficiency and flexibility has a clear implication for many applications, such as high-resolution optical microscopy [1], petawatt-class laser development via optical parametric amplification [2], or industrial pattern recognition [3]. For ultrafast optics, diffractive elements play a significant role in tailoring nonlinear processes, because they allow us to modify the spatial and temporal shape of the pulse.…”

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Wavelength tuning of femtosecond pulses generated in nonlinear crystals by using diffractive lenses

et al. 2010

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We demonstrate that diffractive lenses (DLs) can be used as a simple method to tune the central wavelength of femtosecond pulses generated from second-order nonlinear optical processes in birefringent crystals. The wavelength tunability is achieved by changing the relative distance between the nonlinear crystal and the DL, which acts in a focusing configuration. Besides the many practical applications of the so-generated pulses, the proposed method might be extended to other wavelength ranges by demonstrated similar effects on other nonlinear processes, such as high-order harmonic generation.

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Compact and self-aligned all-optical image correlator based on third-harmonic generation

Cited by 5 publications

References 10 publications

Thick Optical‐Quality Films of Substituted Polyacetylenes with Large, Ultrafast Third‐Order Nonlinearities and Application to Image Correlation

Thick Optical‐Quality Films of Substituted Polyacetylenes with Large, Ultrafast Third‐Order Nonlinearities and Application to Image Correlation

Ultrafast optical image processing based on third-harmonic generation in organic thin films

Wavelength tuning of femtosecond pulses generated in nonlinear crystals by using diffractive lenses

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