The development of frequency stabilized lasers related to the gravitational wave detection is reported. The beat linewidth of laser diode pumped YAG lasers stabilized to the same cavity was measured to be 193 mHz. The source of frequency fluctuation was analyzed carefully. For the higher sensitivity for gravitational wave detection new designs, 100 micrometers thick YVO4 active mirror and virtual source clad pumping YAG lasers are discussed from the view of scaling physics.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.