| 摘要 |
A collimating device (20) comprises a GRIN lens (22), a filter (24) and an outer tube (26). The GRIN lens and the filter are both secured in the outer tube. The outer tube is made of stainless steel, and has a first receiving portion (261) and a second receiving portion (262). The first receiving portion is cylindrical, and defines a cylindrical cavity (264) therein for receiving the GRIN lens. The second receiving portion is also cylindrical, and defines a generally rectangular cavity (266) therein for receiving the filter. The GRIN lens and the filter are glued in the outer tube with relatively little epoxy, and with no excess epoxy contaminating optical faces thereof.
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