University of Southampton

Qioptiq Photonics Gmbh & Co Kg

Huw Major

Peter George Robin Smith

Corin Barry Edmund Gawith

Frank Mueller

Lu Ming

An optical crystal for converting an input light beam, the crystal having an ingress surface, an egress surface, and a fan-out grating has a fan-out pattern oriented at an offset angle &#x3b8; in the range of 1&#xb0; to 45&#xb0; with respect to a beam entry plane at a beam ingress location.

Non-linear optical device with a broadened gain bandwidth

A sample of nonlinear optical material for use in a nonlinear optical device contains a grating comprising alternating regions of inverted and non-inverted nonlinear coefficient of the material, with the regions separated by boundaries positioned such that the grating can provide quasi-phase matching of a selected nonlinear optical interaction, and compensate for phase mismatch arising from the Gouy phase shift of one or more focused optical beams involved in the interaction. The boundary positions can be calculated for second harmonic generation or optical parametric generation and oscillation.

Compensation for the Gouy phase shift in quasi-phase matching

A process for poling a ferroelectric material doped with a metal, which process comprises: (i) defining an electrode pattern on a &#x2212;z face of a crystal of the ferroelectric material doped with the metal; (ii) providing an electrode material; (iii) poling at a temperature of not more than 45&#xb0; C.; and (iv) poling by a two-stage voltage-controlled application of electric field based on a first poling stage of domain nucleation and a second poling stage of domain spreading.

Process for poling a ferroelectric material doped with a metal

A method of inducing a periodic variation of nonlinearity value in a sample of ferroelectric material comprises arranging a pair of electrodes on opposite faces of the sample, one electrode defining a desired pattern of nonlinearity variation, applying a pre-bias voltage across the sample for a predetermined time using the electrodes, the pre-bias voltage being less than the coercive field of the ferroelectric material; and after the predetermined time, applying a current-controlled poling voltage across the sample using the electrodes, to produce domain inversion in the sample according to the desired pattern of nonlinearity variation. The pre-bias voltage may be 75% of the coercive field or more, and applied for a pre-determined time between 1 and 100 seconds.

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Southampton, United Kingdom

Huw Major