| 摘要 |
PURPOSE:To make the device easy to clean and highly reliable by keeping an interval between an optical window and a reflection mirror at a fixed distance. CONSTITUTION:A photodirecting channel is formed inside a glass pipe 11 and an optical glass window 12 having a surface parallel to the end surface of the photodirecting channel is sealed by heating to the glass pipe 11. And the end surface of the photodirecting channel and the inside surface of the optical window 12 are filled with the substance having the refractive index whose value is near to the optical refractive indexes of the two, and in opposition to the optical window 12 a back surface mirror 14 having a diameter equal to or larger than the diameter of the channel. Furthermore, a glass support 13 is provided, which is a means for keeping the interval between the window 12 and the back surface mirror 14, a reflection mirror, fixed. |
