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QPC Lasers Inc. - QPC Lasers is LIDAR 4-24 LB
Photonics Dictionary

doublet

1. A compound lens consisting of two elements. If there is an air space between the elements it is called an "air-spaced doublet.'' If the inner surfaces are cemented together, it is called a "cemented doublet.'' 2. Two spectral lines produced by a transition between a common state and two states differing only in total angular momentum.
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