A system and method that effectively measures the polarization dependent gain of an optical amplifier without significantly introducing error into that measurement is provided. ; and producing nano-sized titanium dioxide ultrafine powder having an average particle size of less than 50 nm. A spring-based block component is positioned inside the fuel outlet portion. Then, handling acknowledgments from the interested parties may be gathered after a specific delay. An adaptive logic module is coupled to the command module and to the motor sensor. Optical magnification m2 of the second divergent angle-converting element for the second light flux and optical magnification m3 of the second divergent angle-converting element for the third light flux are different from each other.