Kalsium Fluoride (CaF2)
Nā Lens Bi-Concave

ʻO nā lens Bi-concave a i ʻole Double-concave (DCV) nā lens maikaʻi ʻole i ʻoi aku ka mānoanoa ma ka ʻaoʻao ma mua o ka waena, ke hele ka mālamalama ma o lākou, ʻokoʻa ia a ʻo ke kiko kikoʻī he virtual.Loaʻa i nā lens Bi-Concave ka radius like o ka curvature ma nā ʻaoʻao ʻelua o ka ʻōnaehana optical, ʻaʻole maikaʻi ko lākou lōʻihi kikoʻī, a me ka radii o ka curvature o nā ʻaoʻao curved.ʻO ka lōʻihi kikoʻī maikaʻi ʻole e hoʻokaʻawale i ka mālamalama hanana collimated, hoʻohana pinepine ʻia lākou e hoʻokaʻawale i kahi kukui convergent.Ma muli o ko lākou mau hiʻohiʻona, hoʻohana mau ʻia nā lens bi-concave no ka hoʻonui ʻana i ka mālamalama i loko o nā mea hoʻonui kukui ʻano Galilaia a i ʻole e hoʻonui i ka lōʻihi kiko o ka lens converging ma o ka hoʻohana pālua ʻana i nā ʻōnaehana e kū nei e like me nā ʻōnaehana projection māmā.He mea maikaʻi nō hoʻi lākou i ka hōʻemi ʻana i ke kiʻi.I loko o nā ʻōnaehana optical, he mea maʻamau ke koho pono ʻana i kā lākou optics i hiki ke hoʻopau ʻia nā aberrations i hoʻokomo ʻia e nā lens-focal-lōʻihi maikaʻi a maikaʻi ʻole.Hoʻohana pinepine ʻia kēia mau lens maikaʻi ʻole i nā telescopes, nā kamera, nā lasers a i ʻole nā aniani e kōkua i nā ʻōnaehana hoʻonui e ʻoi aku ka paʻakikī.

ʻO nā lens bi-concave (a i ʻole nā lens concave pālua) ke koho maikaʻi loa inā aia ka mea a me ke kiʻi i nā ratio conjugate piha (ka mamao o nā mea i puʻunaue ʻia e ka disdance kiʻi) kokoke i 1:1 me nā kukuna komo hoʻohuli, e like me ka bi-convex. nā leka uila.Hoʻohana ʻia lākou no nā noi kiʻi hou (mea virtual a me ke kiʻi).Ke emi iho ka hoʻonui piha i makemake ʻia ma mua o 0.2 a ʻoi aku paha ma mua o 5, ʻoi aku ka maikaʻi o nā lens plano-concave.

Ma muli o kona hoʻouna kiʻekiʻe mai 0.18 µm a i 8.0 μm, hōʻike ka calcium fluoride i kahi helu refractive haʻahaʻa e ʻokoʻa ana mai 1.35 a i 1.51 a hoʻohana maʻamau ʻia no nā noi e koi ana i ka hoʻouna kiʻekiʻe i nā pae spectral infrared a me ultraviolet, loaʻa iā ia kahi kuhikuhi refractive o 1.428 ma 1.064. µm.ʻAʻole inert kemika ʻo CaF2 a hāʻawi i ka ʻoi aku ka paʻakikī i hoʻohālikelike ʻia me kāna barium fluoride, a me nā hoahānau fluoride magnesium.ʻO kāna paepae pōʻino laser kiʻekiʻe loa e pono ai no ka hoʻohana ʻana me nā laser excimer.Hāʻawi ʻo Paralight Optics i nā lens Bi-concave Calcium Fluoride (CaF2) me nā uhi antireflection no ka 3 a 5 µm ka lōʻihi hawewe.Hoʻemi nui kēia uhi i ka awelika o ka nānā ʻana o ka substrate ma lalo o 2.0%, e hāʻawi ana i ka hoʻoili awelika kiʻekiʻe ma mua o 96% ma waena o ka pae uhi AR āpau.E nānā i nā kiʻi ma lalo no kāu mau kuhikuhi.