Testing of holographic optical elements for holographic gun-sight

Bhatt, Rahul; Mainali, Lata; Bhatnagar, G. S.; Sharma, Alpesh K.; Gupta, A.

doi:10.1016/j.optlaseng.2007.10.006

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…HOEs are emerging as viable alternatives to conventional optical elements in many applications due to their light weight, low cost and simple fabrication technique [42][43][44][45][46]. They have potential applications in optical and opto-electronic systems such as imaging applications (coherent imaging, broadband imaging, white light imaging) [47][48][49][50][51][52], non-imaging applications (filters, solar concentrators) [53,54], optical information processing (pattern recognition, information encoding, optical interconnection, optical switching, phase shifting and modulation) [55][56][57][58], optical-fiber communications (wavelength multiplexers, de-multiplexers, couplers and branching elements) [59][60][61][62], optical scanners (bar-code readers, facsimile systems, computer printers, point-of-sale-scanners and laser displays) [63,64], optical sensors (finger print sensors, humidity and temperature sensors) [65,66], optical disc pickup heads (compact audio and video disc players and computer disc drives) [67,68], optical beam shaping [69], optical micromanipulation [70], defense applications (holographic head-up displays, weapon sights, night vision glasses) [71][72][73][74], conical scanning lidar telescopes [75], laser doppler anemometry [76] and many others [77][78][79]…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of different types of holographic lenses, with analysis of their imagery and aberration

Ghosh¹,

Nirala²

2017

Meas. Sci. Technol.

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In this communication we have experimentally investigated and realized the following for the first time to the best of our information: two new types of hololenses; three compact two hololens imaging systems consisting of one each of the first and second type, one each of the second and first type, and two of the second type for coherent one to one imagery; and three compact four hololens imaging systems consisting of two of each of the first and second types, two of each of the second and first type, and four of the second type to form low f-number imaging systems. In addition, problems with the existing two hololens and four hololens imaging systems are discussed in the present study and a modified geometry is proposed with supporting mathematical analysis and experimental evidence. To reduce the problems of alignment difficulty, degrees of freedom and bulkiness associated with two hololens imaging systems, a third type of hololens is also reported, which can perform coherent one to one imagery by itself. All the imaging systems consisting of hololenses can perform imaging free from almost all monochromatic aberration for the conditions under which they were recorded. Complete analyses of recording, playback, imagery and aberration for all the hololenses and the compact two and four hololens imaging systems are performed. The resolution of all three types of hololenses is found to be 57 lines mm−1, whereas the resolution of the compact two hololens imaging systems is 32 lines mm−1. The average diameter of the focused spots of the first, second and third type of hololens are experimentally found to be 344.45 µm, 339.75 µm and 190.22 µm respectively.

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Section: Introductionmentioning

confidence: 99%

Design and fabrication of different types of holographic lenses, with analysis of their imagery and aberration

Ghosh¹,

Nirala²

2017

Meas. Sci. Technol.

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Reviews: Torsional spring mechanism resonant scanner’s technology

Koay

Rahim

2016

J Mech Sci Technol

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Fabrication of a phase transmission holographic optical element in polycarbonate and its characterization

Vadivelan

Shekar²

2016

Appl. Opt.

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The phase transmission holographic optical element in silver halide holographic emulsion, especially for holographic collimator sights, is fabricated and the desired diffraction efficiency is obtained with very high transmission. One of the main drawbacks of these holograms are that they become dark by being exposed under sunlight, and this darkness drastically reduces the visible transmission and diffraction efficiency of a holographic optical element, hence it is not suitable for weapon sight application. To overcome this problem, we transferred a holographic optical element with a reticle image from silver halide into polycarbonate by using copying, electroforming, and recombination techniques. The holographic optical element in polycarbonate has many advantages; the detailed method of fabrication, transfer, and its characterization are presented. The very interesting result of diffraction efficiency variation with angle obtained in polycarbonate is discussed.

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Testing of holographic optical elements for holographic gun-sight

Cited by 4 publications

References 13 publications

Design and fabrication of different types of holographic lenses, with analysis of their imagery and aberration

Design and fabrication of different types of holographic lenses, with analysis of their imagery and aberration

Reviews: Torsional spring mechanism resonant scanner’s technology

Fabrication of a phase transmission holographic optical element in polycarbonate and its characterization

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