We have synthesized large batches of GaSe reacted mixtures and grown centimeter size indium doped single crystals by the vertical Bridgman technique. Second harmonic measurements were made for high rep rates and data showed a "d" value of 51 pm/V for the GaSe crystals. SHG values were also theoretically calculated and appear to be in good agreement with the experimental data. These values were smaller compared to solid solution GaSe crystals, which showed a "d" value higher than 72 pm/V.
Mercurous bromide crystals with very good optical transparency were grown by the physical vapor transport method. A design was developed to fabricate 10-degree orientation acousto-optic tunable filters operating in the mid and long wavelength regions. An acousto-optic tunable filter (AOTF) was fabricated using a crystal with a 13-15 mm diameter. A theoretical tuning curve for a mercurous bromide crystal based AOTF using this design was also computed for the first time.