CRYSTALLIZED GLASS AND METHOD FOR MANUFACTURING SAME

摘要

What is achieved is an optical wavelength multiplexer/demultiplexer not necessarily requiring the function of adjusting the optical path. A value (”L max -”L min )/L obtained by dividing a difference between a maximum value ”L max and a minimum value ”L min of ”L in a range of -40°C to 80°C by L is 8×10 -6 or less where L represents a length of a crystallized glass (1) at 30°C and ”L represents a difference between a length (L t ) of the crystallized glass (1) at each of the temperatures and the length (L) thereof at 30°C.