Laser Energetics Inc. of Mercerville, N.J., said it has received an order for a fully developed, pre-production clinical laser system based on its BrightStar Alexandrite laser. The $500,000 order was placed by Hygenilase Inc., a new joint venture between Laser Energetics and Lantis Laser Inc. of Denville, N.J. Hygenilase will market the BrightStar to dentists for cleaning teeth below and above the gum line.  Laser Energetics completed a previous order from Hygenilase for an Alexandrite development laser and a cost-to-manufacture study evaluating the cost of making the new compact Alexandrite laser for dental applications.