Optical Limiting with Lithium Niobate

Cook, Gary; Jones, David C.; Finnan, Craig J.; Taylor, L.; Vere, Tony W.; Duignan, Jason P.

doi:10.1557/proc-597-263

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…For instance, sodium niobate (NaNbO 3 ) glasses 287,288 have shown dependency of the OL effect on the population number of nanocrystals in the glass, with OL capability increasing upon population increase. Lithium niobate (LiNbO 3 ) doped with iron 289 or cobalt 290 gave much improved results concerning the OL effect, with the Co-doped system displaying NLO third-order susceptibility (χ 3 ) in the order of 10 −5 esu. 290 Similar results were obtained when lithium borate (Li 2 B 4 O 7 ) doped with manganese 291 and copper was analyzed.…”

Section: Nanocrystalsmentioning

confidence: 99%

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting. All known mechanisms of optical limiting have been analyzed and discussed for the different types of materials.

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Section: Nanocrystalsmentioning

confidence: 99%

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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“…Note that the presence of the phase shift in both cells confirms that the optical gain is real and is not an artefact of the strong diffraction efficiency in the cells. Because there is no coupling in either cell design without applying a voltage, charge diffusion must be negligible and the phase shift is most probably due to saturation of the space charge field giving rise to a non-sinusoidal index grating in a similar manner to the photovoltaic effect in Fe:LiNb03 [3][4][5][6].…”

Section: Discussionmentioning

confidence: 99%

<title>Transversely excited liquid crystal cells</title>

2002

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The integration of photorefractive liquid crystal beam coupling devices into optical systems is often hampered by the need to tilt the liquid crystal cells to high angles of incidence in order to obtain efficient beam coupling. Owing to poor charge diffusion in most liquid crystal systems, charge migration depends mainly on an externally applied drift field. Conventional cells, with electrodes applied to the surfaces of the windows, therefore need to be tilted with respect to the incident light to enable a component of the applied electric field to appear along the direction of the optical grating k-vector. This paper reports on an alternative design in which the electric field is applied transversely, enabling devices to be presented at normal incidence to the system optical propagation direction. We demonstrate the optical gain from transversely excited homeotropic liquid crystal cells is very similar to that obtainable with conventional homeotropic cells, with the added unexpected advantage of an order of magnitude increase in speed.

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“…1, this condition affects both the amplitude and phase of the space-charge field. For photovoltaic fields less than the saturation field, the detrimental effect of a reduced grating phase shift is generally compensated by an enhancement of the space-charge field amplitude 5,7 . At very high photovoltaic fields (≥ saturation field) the grating phase shift progressively approaches the ideal 90° phase shift.…”

Section: Introductionmentioning

confidence: 99%

“…However, it has been noted that the coupling efficiency seems to be strongly dependent on the focal position and spot size, which is attributed to diffraction and the resulting change in the spatial overlaps 5,10 . A simplified beam coupling theory which approximates the diffraction effects of a focused beam for small f-numbers was given in Ref.…”

Section: Introductionmentioning

confidence: 99%