Yissum - Research Development Company of the Hebrew University

Thick optical crystals for optical parametric amplifiers

Posted by Yissum - Research Development Company of the Hebrew UniversityResponsive · Innovative Products and Technologies · Israel

Summary of the technology

(original title of project: Optical Parametric Amplifier with Large Aperture)

The invention:
• Diffusion bonded periodically poled crystals can increase the effective crystal aperture with high gain and good beam profile
• (Method to tune crystal materials to optically amplify light signals)

Project ID : 14-2018-5685

Description of the technology


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.

Project manager

Matt Zarek

Project researchers

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

Related keywords

  • Electronics, Microelectronics
  • Nanotechnologies related to electronics & microelectronics
  • Micro and Nanotechnology related to Electronics and Microelectronics
  • Materials Technology
  • Chemistry
  • Optics
  • Optical Materials
  • Optical Technology related to measurements
  • Physics
  • Physical Sciences and Exact Sciences
  • Measurements and Standards
  • Amplifier, A/D Transducer
  • Electronic measurement systems
  • Recording Devices
  • Measurement Tools
  • Some other electronics related
  • Chemicals and Materials
  • Fibre Optics
  • Laser Related
  • Micro & Opto Electronics
  • Optoelectronics / Photonics

About Yissum - Research Development Company of the Hebrew University

Technology Transfer Office from Israel

Yissum Research Development Company of the Hebrew University of Jerusalem Ltd. Founded in 1964 to protect and commercialize the Hebrew University’s intellectual property. Ranked among the top technology transfer companies, Yissum has registered over 8,900 patents covering 2,500 inventions; has licensed out 800 technologies and has spun-off 90 companies. Products that are based on Hebrew University technologies and were commercialized by Yissum generate today over $2 Billion in annual sales.

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