PQ:PMMA Holographic Wavelength Division Multiplexing Filters For Use in Monocular Passive Ranging and Free Space Optical Communications

Gamboa, Julian; Vonckx, Joseph; Fouda, Mohamed; Shahriar, Selim M.

doi:10.1364/fio.2020.fw7a.1

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Volume HOEs are a great candidate for such an application, as they can function as diffractive spectral filters with customizable center wavelength and FWHM. 8,11 PQ:PMMA is a write-once read-many photopolymer that can be created in thicknesses up to millimeter scale, allowing the stored holograms to function in the Bragg regime. Gratings are formed by interfering expanded laser beams within the material, whereby the peaks and troughs of the interference pattern result in correspondingly strong or weak reactions between the PQ dye molecules and MMA monomers, yielding a modulation of the refractive index.…”

Section: Nir Holographic Filtersmentioning

confidence: 99%

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Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer

Gamboa¹,

Hamidfar²,

Shen³

et al. 2023

Practical Holography XXXVII: Displays, Materials, and Applications

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Distance estimation is an important yet challenging part of any tracking system, as being able to quickly locate an object in 3D space allows for the automated targeting of communication, delivery, and interception systems, as well as providing important telemetry about fast moving objects. A monocular passive ranging system is defined as that which only requires one observation point through which it measures some outside signal to estimate range. The approach presented here simultaneously observes the intensity of light emitted by the target at three wavelength bands with ~10nm FWHM, centered at 750, 762, and 780 nm. The light is separated using a PQ:PMMA holographic optical element (HOE) configured as a wavelength division demultiplexer. Light at the two outer bands experiences negligible absorption in the atmosphere, while light at ~762 nm is strongly absorbed by O2. By comparing the intensity of the two unabsorbed bands, we may interpolate the expected intensity of the 762 nm band if there is no O2 in the path. This is then used in conjunction with the 762 nm band measurement to approximate the total O2 transmissivity. Finally, Beer’s law and the HITRAN database provide us with the tools to convert a transmissivity into a distance estimation. The use of an HOE is pivotal in the practicality of such a system, as it allows us to measure all three signals simultaneously, thus eliminating the effects of turbulence and reducing overall noise.

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Section: Nir Holographic Filtersmentioning

confidence: 99%

“…In order to overcome this limitation, it is necessary to perform k-vector matching to find the writing angles for 532 nm beams that produce equivalent gratings that can match the design parameters. 8,11 Figure 2. Spectral-spatial filtering diagram.…”

Section: Nir Holographic Filtersmentioning

confidence: 99%

Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer

Gamboa¹,

Hamidfar²,

Shen³

et al. 2023

Practical Holography XXXVII: Displays, Materials, and Applications

Self Cite

View full text Add to dashboard Cite

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Thick PQ:PMMA transmission holograms for free-space optical communication via wavelength-division multiplexing

et al. 2021

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Phenantrenequinone doped poly(methyl-methacrylate) (PQ:PMMA) is a holographic substrate that can be used for angle or wavelength multiplexed Bragg gratings. However, efficient writings can be done only using a high-power, long-coherence volume laser over a limited wavelength range. This constraint makes it difficult to write gratings that would diffract several different read wavelengths into a single direction. We describe the rules for writing such gratings, taking into account the differences in the mean index seen by the write and read wavelengths. We further demonstrate the use of such a transmission hologram for wavelength-division multiplexing in a free-space optical communication system.

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Shift Invariant Correlation using the Hybrid Optoelectronic Correlator with a PQ:PMMA Holographic Memory Device

Gamboa

Hamidfar

Shahriar

2021

Frontiers in Optics + Laser Science 2021

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PQ:PMMA Holographic Wavelength Division Multiplexing Filters For Use in Monocular Passive Ranging and Free Space Optical Communications

Abstract: We demonstrate the use of angle multiplexed holograms for wavelength division multiplexing in free space optical communications, with application to absorption based monocular passive ranging using three simultaneous and superimposed spectral filters.

Cited by 4 publications

References 5 publications

Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer

Monocular passive ranging through a PQ:PMMA holographic wavelength division demultiplexer

Thick PQ:PMMA transmission holograms for free-space optical communication via wavelength-division multiplexing

Shift Invariant Correlation using the Hybrid Optoelectronic Correlator with a PQ:PMMA Holographic Memory Device

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