Nippon Electric Glass Co., Ltd.

Shuhei Ogawa

Hirokazu Takeuchi

Shingo Nakane

Nobuo Funabiki

Masahiro Kobayashi

What is achieved is an optical wavelength multiplexer/demultiplexer not necessarily requiring the function of adjusting the optical path. A value (&#x394;L&#x2212;&#x394;L)/L obtained by dividing a difference between a maximum value &#x394;Land a minimum value &#x394;Lof &#x394;L in a range of &#x2212;40&#xb0; C. to 80&#xb0; C. by L is 8&#xd7;10or less where L represents a length of a crystallized glass () at 30&#xb0; C. and &#x394;L represents a difference between a length (L) of the crystallized glass () at each of the temperatures and the length (L) thereof at 30&#xb0; C.

Crystallized glass and method for manufacturing same

In a LiO&#x2014;AlO&#x2014;SiObased crystallized glass using SnOas a substitute fining agent for AsOor SbO, a crystallized glass having less yellow coloration is provided at low costs. The glass is a LiO&#x2014;AlO&#x2014;SiObased crystallized glass comprising from 0.01 to 0.9% of SnOin terms of % by mass and having a content of each of AsOand SbOof 1,000 ppm or less as a glass composition, which has a VOcontent of from 0.08 to 15 ppm in the glass composition.

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Otsu, Japan

Shuhei Ogawa