Rh575 is a member of Xanthene group of Laser dyes. The laser dyes behave differently in different surroundings affecting the performance of a dye laser.Therefore it is important to study the effect of surroundings on laser dyes.Solvents, solid hosts and water impurity are the most commonly used surroundings for laser dyes. This book represents the study of effect of all above said surroundings on Rh575.