Periodic poling

Periodic poling

Periodic poling is formation of layers with alternate orientation in a birefringent material. The domains are regularly spaced, with period in a multiple of the desired wavelength of operation. The structure is desired to achieve quasi-phase-matching (QPM) in the material.

Periodically poled crystals are frequently used as nonlinear optical materials. They are up to 20 times more efficient at second-harmonic generation than crystals of the same material without periodic structure. The material for the crystals is usually a wide band gap inorganic crystal, or in some cases a suitable organic polymer. Some popular materials in current use are KTP, lithium niobate, and lithium tantalate.

The periodic structure is created in the crystal using a range of techniques. Pulsed electric field, electron bombardment, thermal pulsing, or other methods can be used to reposition the atoms in the lattice, creating oriented domains. This can be achieved either during the growth of the crystal, or subsequently. [http://www.iop.org/EJ/abstract/0022-3727/28/9/001]

External links

* [http://www.rp-photonics.com/periodic_poling.html Encyclopedia of laser physics and technology]


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Lithium niobate — (LithiumNiobiumOxygen|3) is a compound of niobium, lithium, and oxygen. It is a colorless solid that is insoluble in water. Its melting point is 1257 °C and its density is 4.65 g/cm³. Its CAS number is CASREF|CAS=12031 63 9.Lithium niobate… …   Wikipedia

  • Potassium titanyl phosphate — (KTiOPO4) or KTP is a nonlinear optical material which is commonly used for frequency doubling diode pumped solid state lasers such as and other neodymium doped lasers. The material has a relatively high optical damage threshold ( 15 J/cm²), a… …   Wikipedia

  • Quasi-phase-matching — is a technique in nonlinear optics which allows a positive net flow of energy from the pump frequency to the signal and idler frequencies by creating a periodic structure in the nonlinear medium. Momentum is conserved, as is necessary for phase… …   Wikipedia

  • Birefringence — Displacement of light rays with perpendicular polarization through a birefringent material …   Wikipedia

  • Second harmonic generation — (SHG; also called frequency doubling) is a nonlinear optical process, in which photons interacting with a nonlinear material are effectively combined to form new photons with twice the energy, and therefore twice the frequency and half the… …   Wikipedia

  • Квантовая запутанность —     Квантовая механика …   Википедия

  • Piezoelectricity — is the ability of some materials (notably crystals and certain ceramics, including bone) to generate an electric potentialPrinciples of Instrumental Analysis. 6th Edition, 2007. Skoog, Holler, and Crouch. Chapter 1, Sec. 1C 4, Pg. 9.] in response …   Wikipedia

  • Marsh Arabs — Maʻdān معدان Total population 500,000[1] Regions with significant populations Middle East …   Wikipedia

  • Multiferroics — have been formally defined as materials that exhibit more than one primary ferroic order parameter simultaneously (i.e. in a single phase).[1] The four basic primary ferroic order parameters are ferromagnetism, ferroelectricity, ferroelasticity… …   Wikipedia

  • tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”