Summary of the technology
Along with the dynamic development of optical technology, there is an increasing interest in materials characterized by high birefringence and high efficiency of generating the second harmonic. The presented offer relates to co-crystals, from which one of polymorphic form is an efficient, phase matchable second harmonic generator. The averaged, relative experimental of second harmonic generation is over 14 times higher than of the commonly used nonlinear material (potassium dihydrogen phosphate). The presented optical material is colorless, suitable for growing large single crystals. The obtained crystals have extreme values of birefringence with reference to other transparent materials. The maximum birefringence for one of the polymorphic form is 0,46. For comparison, calcite, which is commonly used for the production of polarizing prisms, has a birefringence c.a 0.17.
The offered materials, thanks to their properties, may be used for the construction of optical devices and components. Moreover, due to the polar structure may exhibit properties such as pyroelectricity, piezoelectricity or ferroelectricity.
Description of the technology
The phenomenon of birefringence is used in many optical devices, including liquid crystal displays, light modulators, OAGs (optical axis gratings) as well as in the production of optical elements, e.g. the Nicol prism and wave plates. Filters with known birefringence are used in cameras to compensate for the irreversible signal distortion, the so-called spatial aliasing. Birefringence plays also a key role in nonlinear optical processes, including the second harmonic generation (SHG). Materials exhibiting nonlinear optical properties (NLO) are widely used in optoelectronics, e.g. for the conversion of light frequency as well as in photonics and telecommunications.
The presented offer relates to two polymorphic forms of a co-crystal. Noncentrosymmetric form (I) is an efficient, phase matchable second harmonic generator. Both co-crystals are colorless, suitable for growing large single crystals and mechanical processing. The averaged, relative experimental of second harmonic generation efficiency for the powder sample of (I) is over 14 times higher than of the commonly used non-linear material - potassium dihydrogen phosphate KDP (14.68 KDP at 1000 nm). The theoretically determined deff value for the single crystal is 16 pm V-1, while for KDP it is equal to 0.35 pm V-1. The experimental results showed that both co-crystals are biaxial and optically negative. Polymorphic forms can be also differentiated using their birefringence - form (I) has a maximum birefringence of 0.46 while for the form (II) birefringence equals 0.3. The obtained crystals have extreme values of birefringence in comparison to other transparent materials e.g. calcite, which is commonly used for the production of polarizing prisms, has a birefringence c.a 0.17.The offered materials, thanks to their properties, may be used for the construction of optical devices and components. Moreover, due to the polar structure may exhibit properties such as pyroelectricity, piezoelectricity or ferroelectricity.
Advantages of the technology:
The presented optical materials are characterized by:
- large birefringence (2-3 times greater compared to commonly used polarizing prisms),
- the high efficiency of the second harmonic generation ( 14 times higher than of the commercial used optical material) and ability to fulfill phase matching condition,
- the colorlessness desired in the context of optical applications,
- suitable for growing large single crystals.
The above-mentioned features of the presented technology testify to the competitiveness in relation to the materials currently used for the construction of optical systems (e.g liquid crystal displays, CD / DVD laser reading systems, optical fiber technology, LED matrices, photoelectric detectors).
Desired business relationship
Optical devices and components, optoelectronics, nonlinear optics
Current development status
Intellectual property status
Patent already applied for
Centre Technology Transfer CITTRU
Technology Transfer Office
About Centre Technology Transfer CITTRU
Technology Transfer Office from PolandCentre Technology Transfer CITTRU
Centre for Innovation, Technology Transfer and University Development (CITTRU) is a part of Jagiellonian University, whose role is to promote university research, to support innovation and to create cooperation with the business. CITTRU main task is to offer the scientific achievements of the Jagiellonian University in the market by providing legal protection, licensing, sale of intellectual property rights, creation of academic business, coordination of company-ordered research projects, etc. Currently promoted technologies are mainly focused on new materials science, pharmacology and medical technology. Inventions offered by Jagiellonian University are promoted and awarded during numerous exhibitions, e.g. 58th International Exhibition of Innovation, Research and New Technologies INNOVA (BRUSSELS 2009), 38th International Exhibition of Invention New Techniques & Products (Geneva 2010) or 24th International exhibition of environmental equipment, technologies and services POLLUTEC (Paris 2009).