The joint (10) is bonded to an optical material (11) capable of transmitting light and a cooling material (12).At the bonding interface between the optical material (11) and the cooling material (12), the junction (10) is capable of penetrating light, and the atoms contained in the optical material (11) diffuse into the cooling material (12) so that no interference fringes occur in the junction (10).The penetration depth of atoms contained in the optical material (11) into the cooling material (12) is about 1.0 nm to about μ It may be within the range of M.
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