Thick optical crystals for optical parametric amplifiers

Marcus Gilad, HUJI, School of Computer Science and Engineering, Applied Physics


Computer Science and Engineering   


Laser, optical amplifier, polled crystal

Current development stage

General list: TRL3 Experimental proof of concept            


Optical Parametric Amplification is a process in which a strong pump field nonlinearly interacts with a medium to drive secondary waves at different frequencies. Maximum gain is obtained when the phase-matching condition of the wave vectors (pump, signal and idler beams) is met. Usually, it is difficult to achieve phase-matching conditions in an isotropic medium due to the characteristic dependence of the refractive index on wavelength. Quasi-phase matching is a technique that exploits electric field poling of ferroelectric oxide crystals to obtain optical parametric amplifiers. However, a major drawback of this technique is the small aperture size of the periodically poled crystals.

Our Innovation

  • The present invention concerns a method for parametrically amplifying a signal beam in large aperture periodically poled crystal, which is composed of at least two periodically poled crystals.
  • Diffusion bonded periodically poled crystals can increase the effective crystal aperture with high gain and good beam profile.
  • Can expand quasi-phase matching to high power devices that need large apertures.


The width of a periodically poled crystal can be increased by stitching (at least) two crystals together using diffusion-bonding and so one can obtain a larger aperture.


Diffusion bonding is a promising technique to obtain large aperture optical parametric amplifiers based on periodically poled crystals and will allow their use in high-energy applications.

Contact for more information:

Matt Zarek
Contact ME: