US 5,335,303 A · Quasi-phased matched optical waveguide frequency conversion element having a ferroelectric liquid crystalline material exhibiting a periodic structure

Abstract

An optical frequency conversion element has a wave-guiding layer which consists of a .chi..sup.(2) -active ferroelectric liquid crystal. The monomeric or polymeric liquid crystal material has a periodic structure which permits the so-called quasi phase matching of a guided laser beam. The period length of the structure is equal to twice the coherence length l.sub.c =.pi./.DELTA..beta. of the material, whereby .DELTA..beta.=.beta..sub.o (2.omega.)-2.beta..sub.o (.omega.), with .omega.=angular frequency of the fundamental wave, 0=zero-order mode and .beta.=propagation constant of the mode.

Claims11

Dependent claims

An optical element for efficient generation of short-wave laser light by frequency conversion by means of a wave-guiding layer, wherein the wave-guiding layer comprises a ferroelectric .chi..sup.(2) -active monomeric or polymeric liquid crystalline material having a periodic structure which permits a quasi phase matching of a guided laser beam, the period length of the three-dimensional structure being equal to twice the coherence length l.sub.c =.pi./.DELTA..beta. of the material, whereby .DELTA..beta.=.beta..sub.o (2.omega.)-2.beta..sub.o (.omega.), with .omega.=angular frequency of the fundamental wave, 0=zero-order mode and .beta.=propagation constant of the mode.

Dependencies are inferred from the claim text.

Facts

Application

08/102,676Filed 5 Aug 1993 · continuation

Priority

CH 1878/9125 Jun 1991

Granted

2 Aug 1994

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

C07D 239/26
Having three or more double bonds between ring members or between ring members and non-ring members: with only hydrogen atoms, hydrocarbon or…
C07C 229/64
With amino and carboxyl groups bound to carbon atoms of the same non-condensed six-membered aromatic ring: the carbon skeleton being further…
G02F 1/3775
In an optical waveguide structure: with a periodic structure, e.g. domain inversion, for quasi-phase-matching [QPM]
G02F 1/141
Based on orientation effects in which the liquid crystal remains transparent: using ferroelectric liquid crystals

Quasi-phased matched optical waveguide frequency conversion element having a ferroelectric liquid crystalline material exhibiting a periodic structure

Life of this patent

Quasi-phased matched optical waveguide frequency conversion element having a ferroelectric liquid crystalline material exhibiting a periodic structure

Life of this patent

Abstract

Claims11