In pulsed flashlamps and filter envelopes made of quartz tubes with appropriate thickness and proper concentration of doped rare-earth elements, such as cerium, europium etc, UV radiation below 3500 A is essentially eliminated, thus filter solution and yellow glass filter envelopes in solid state lasers can be replaced and the colouring of laser material prevented.Comparison has been made among filtering characteristics of different filter materials and their efficiencies in repetitive pulse Nd:YAG lasers. Experimental results show that using doped-quartz in Nd:YAG laser and Nd:glass lasers, laser efficiency can be increased by (25-100)%, or even higher.