Holographic memory with one-beam geometry in photorefractive crystal

Naruse, S; Shiratori, Akira; Obara, Minoru

doi:10.1063/1.119465

Cited by 16 publications

(3 citation statements)

References 15 publications

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“…al. [7] uses the interaction between two beams which is split from one input incident beam at the corner of the crystal. The last one developed recently by Liu et.…”

Section: Introductionmentioning

confidence: 99%

Single-beam holography using anisotropic self-diffraction

Buranasiri

Banerjee

2006

SPIE Proceedings

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We report a new kind of single incident beam holography. In this method, we use only one beam instead of two beams to make gratings inside photorefractive cerium doped barium titanate. The configuration of the method is based on an anisotropic self-diffraction scheme. The reflection of self-phase conjugate beam at the surface of incidence plays the role of the second beam. By using the reflection of the self-phase conjugate beam, the difficulty of alignment between two focused writing beams has been eliminated. The autocorrelation images in non-Bragg orders have been monitored in order to verify the effectiveness of this method for writing holograms. INTRODUCTIONImage correlation using higher non-Bragg order self-diffraction in photorefractive (PR) materials has been investigated by our group for more than a decade [1,2,3]. Anisotropic self-diffraction (ASD) has been of interest to researchers for sometime. In this set up, the writing beams need to be at some specific angles with each other in order to generate the higher orders with polarization perpendicular to the incident beams. The writing beams are simultaneously diffracted by their own gratings and thus generate higher orders. Recently, higher order beams from the anisotropic self-diffraction scheme have been used for image correlation [4,5].Recording a hologram by using one incident beam is interesting because it may give us more choices to write a hologram using cheaper semiconductor lasers which have short coherent length, and simplifies the need for exact alignment of the incident signal and reference beams in the crystal. To the best of our knowledge, three single incident beam holography configurations have been developed. The first configuration developed by Kukhtarev et. al. [6] uses the interaction of two orthogonally polarized eigenmodes split from one incident beam via photogalvanic effect in a birefringent photogalvanic crystal. The second one developed by Naruse et. al. [7] uses the interaction between two beams which is split from one input incident beam at the corner of the crystal. The last one developed recently by Liu et. al. [8] uses the interaction between the fanning light from one input beam incident on LiNbO 3 . Recently, we have demonstrated single beam ASD [9]. In this configuration, the self phase conjugate (PC) beam reflected from the inicdent surface is used as another writing beam. Although the power ratio between the incident and reflected phase conjugate beam (RPC) is low, higher orders still have been observed. In this paper, autocorrelation images of one incident beam ASD have been shown to prove the validity of recording a hologram by using single beam. ANISOTROPIC SELF-DIFFRACTIONSince ASD in PR media was first introduced by Kukhtarev et. al.[10], the effect has been investigated intensively in recent years. Recently Wang et. al. developed the theory of phase mismatched ASD [11]. One of the interesting properties of ASD is that the polarization of the higher order beams is perpendicular to the polarization of the inci...

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“…al. [7] uses the interaction between two beams which is split from one input incident beam at the corner of the crystal. The last one developed recently by Liu et.…”

Section: Introductionmentioning

confidence: 99%

Single-beam holography using anisotropic self-diffraction

Buranasiri

Banerjee

2006

SPIE Proceedings

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“…Later, Naruse et al [22] multiplexed ten gratings into a Fe-doped LiNbO 3 crystal with a single recording beam. They used the crystal edge in a wavefront splitting arrangement.…”

Section: Writing Gratings With a Single Beammentioning

confidence: 99%

Holographically Recorded Low Spatial Frequency Volume Bragg Gratings and Holographic Optical Elements

Martin¹,

Akbari²,

Keshri³

et al. 2017

Holographic Materials and Optical Systems

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Low spatial frequency volume gratings (a few hundred lines per millimetre) are near the borderline of what can be considered Bragg gratings. Nevertheless, in some applications, their very low selectivity can be a benefit because it increases the angular and spectral working range of the holographic optical element. This chapter presents work carried out using an instantaneously selfdeveloping photopolymer recording material and examines holographic optical elements with spatial frequencies below 500 lines/mm. The advantages of volume photopolymer holographic gratings are discussed in the context of existing research. Specific examples explored include a combination of off-axis cylindrical lenses used to direct light from a solar simulator onto a c-Si solar cell, producing increases of up to 60% in the energy collected. A study of the microstructure of such elements is also presented. A good fit is obtained between the experimental and theoretical Bragg curves and the microstructure of the element is examined directly using microscopy. This is followed by a discussion of an unusual holographic recording approach that uses the nonlinearities inherent in low spatial frequency grating profiles to record gratings using a single beam. In conclusion, the properties of low spatial frequency volume gratings are summarized and future development discussed.

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“…Naruse et al [4] multiplexed ten gratings into a Fe-doped LiNbO crystal with a single recording beam by using the crystal edge in a wavefront-splitting arrangement. Mitsuhashi and Obara [5], using a similar approach, reported successful demonstration of a compact holographic memory system using a single beam geometry in Fe-doped LiNbO .…”

Section: Holographic Recording With a Single Beammentioning

confidence: 99%

Recording of high efficiency volume Bragg gratings in a photopolymer using diffraction from very weak pre-recorded gratings

Bade¹,

Naydenova²,

Toal³

et al. 2016

Optical Data Processing and Storage

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A two-step method of writing high di raction efciency holographic gratings in photopolymer using just one writing beam during the second step is discussed. The technique is based on the use of weak gratings (<1%) recorded during a rst step which during the second step are illuminated with a single beam to form strong highly e cient holographic gratings. The weak grating provides a second interfering beam by di racting a small portion of the illuminating light. Although e ects such as beam pumping and two wave mixing are well known in dynamic re-writable recording media such as photorefractives, the ability to write with one beam, or 'pump' gratings is not usually observed in photopolymer materials. Other methods of recording with a single beam have been reported, especially for data storage, but they use compact optical systems, polarization e ects or lenticular devices to produce the required second beam. In this method, the second beam is produced within the photopolymer medium. Earlier work by the authors reported increases in e ciency of weak photopolymer gratings illuminated by a single exposure beam, and more recently evidence was presented that di raction at the weak pre-recorded grating was responsible for this e ect. Here we demonstrate a strong dependence of the di raction e ciency on grating thickness and show that the method allows the writing of high di raction e ciency gratings in adverse conditions using a single beam. The possibility of angular multiplexing is also demonstrated. The technique may nd application in writing information using pre-recorded weak holographic gratings and, potentially, in other data storage applications. In this paper it is shown that multiple new gratings can be written which are angularly separated and distinct from the pre-written grating and it is also possible to choose one grating from among a number of pre-written gratings and selectively amplify it without amplifying the others.

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Holographic memory with one-beam geometry in photorefractive crystal

Cited by 16 publications

References 15 publications

Single-beam holography using anisotropic self-diffraction

Single-beam holography using anisotropic self-diffraction

Holographically Recorded Low Spatial Frequency Volume Bragg Gratings and Holographic Optical Elements

Recording of high efficiency volume Bragg gratings in a photopolymer using diffraction from very weak pre-recorded gratings

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