SBIR-STTR Award

This Small Business Innovation Research Phase I project will work to develop the concept that ultra-high performance Nd: YVO4 laser crystals can be grown via a commercially viable hydrothermal processes. Recently, Nd: YVO4 crystal growth program using proprietary hydrothermal growth methods has been developed. Preliminary results indicate that low defect Nd: YVO4 can be grown in aqueous base at ~ 500 microC. These crystals appear to have greatly superior optical properties. Hydrothermal Nd: YVO4 crystals will enable the development of new, higher efficiency, higher performance, lower cost diode pumped solid state lasers that emit at 1064, 532, 355, 266, and 190nm. In this Phase I program, two novel hydrothermal synthetic pathways to the production of single crystal, Nd: YVO4, will be developed and optimized at a scaleable and commercially viable hydrothermal growth process for the production of mm-scale crystals. The optical properties of these crystals will be characterized and a comparison will be made against similar commercially available optical materials. The market for Nd: YVO4 in 2002 was estimated to range from $6-$10 MM. It is almost ideal for DPSS lasers, and Nd: YVO4 is rapidly becoming the material of choice for DPSS laser manufacturers. The growth of this material is projected to be $16-$21 MM by 2005, and thereafter at 25% annually. Hydrothermal Nd: YVO4 crystals will be used to make higher efficiency, higher performance, lower cost diode pumped solid state lasers; these lasers will emit at 1064, 532, and 355, 266, and 190 nm. Because of the advantages and benefits of hydrothermal Nd: YVO4 crystals, the material will rapidly displace existing Nd: YVO4 crystals in most, if not all, diode pumped solid-state laser applications

This Small Business Innovation Research (SBIR) Phase II project will focus on the development of a commercial process for the growth of Neodymium Yttrium Vanadate (Nd: YVO4) single crystals for use in solid-state lasers. This research will generate the commercially viable conditions for growth of large boules of single crystals suitable for use in diode pumped solid-state lasers. The hydrothermal method is a low temperature growth technique that leads to crystals containing less thermal strain, much fewer defects and greater homogeneity than conventional methods. These defects combine to cause considerable optical loss and concomitant reduction in performance. The hydrothermal technique has slower growth kinetics and requires chemical development for economically viable growth. In the Phase I project, preliminary growth conditions that lead to suitable single crystals were identified. These conditions include approximate thermal ranges, a variety of starting materials, seed crystals and mineralizer concentrations. In the Phase II project growth conditions will be systematically optimized to provide suitable transport rates and crystal quality. Once an acceptable growth is developed, the resulting boules will be evaluated for performance efficiency and loss. Commercially benefits will emerge as the company introduces new higher performance crystal materials to the market that cannot be grown by existing crystal growth methods. In addition, new laser materials will be donated to Clemson University for design of new laser devices and cavities supporting the University's participation in the emerging photonics Coalition of the Carolinas that includes Clemson, the OptoElectronics Center at UNC-Charlotte, COMSET at Clemson University, and the Carolina MicroOptics Consortium.