Calcium Fluoride (CaF2)
Muraayadaha Bi-Concave

Bi-concave ama Double-concave (DCV) lenses waa muraayado taban kuwaas oo ka dhumuc weyn cidhifka marka loo eego dhexda, marka iftiinku dhex maro, way kala leexataa oo barta diiradda la saarayaa waa mid muuqaal ah.Muraayadaha Bi-Concave waxay leeyihiin radius siman oo qalooc ah labada dhinac ee nidaamka indhaha, dhererkooda fooxa waa taban, iyo sidoo kale radius of curvature ee sagxadaha qaloocan.Dhererka fogaanta xun ayaa sababa in iftiinka shilka ee is-biirsaday uu kala duwanaado, inta badan waxaa loo isticmaalaa in lagu kala saaro laambad isku-dhafan.Sifooyinkooda awgeed, muraayadaha laba-kooxoodka ah ayaa guud ahaan loo isticmaalaa in lagu balaadhiyo iftiinka nooca Galilean-balaadhiyayaasha laydhka ama kordhinta dhererka foorarka wax ku oolka ah ee lens-isku-xidhka ah iyada oo la adeegsanayo laba-labo nidaamyada jira sida hababka saadaalinta iftiinka.Waxay kaloo faa'iido u leeyihiin marka ay timaado dhimista sawirka.Nidaamyada indhaha, waa wax caadi ah in si taxadar leh loo doorto indho-indheyntooda si ay u-horjeedka ay keeneen lenses-ka-toossan iyo kuwa taban-focal-dhererka ah ay qiyaasaan baabi'iyaan.Muraayadahan taban waxaa badanaa lagu isticmaalaa telescopes, kamaradaha, leysarka ama muraayadaha si ay u caawiyaan nidaamyada weyneynta inay noqdaan kuwo is haysta.

Muraayadaha laba-kooxeed (ama muraayadaha laba-laaban) ayaa ah doorashada ugu fiican marka shayga iyo sawirku ay ku jiraan saamiyo isku xidhan oo dhammaystiran (masafadda shayga loo qaybiyay sawir-la'aanta) oo u dhow 1: 1 oo leh alwaaxyo isku-dhafan, sida kiiska laba-convex muraayadaha.Waxa loo isticmaalaa dib-u-play imaging ( shayga dhabta ah iyo sawirka) codsiyada.Marka weyneynta buuxda ee la rabo uu ka yar yahay 0.2 ama ka weyn yahay 5, muraayadaha plano-concave ayaa badanaa ku habboon.

Iyadoo ay ugu wacan tahay gudbintiisa sare ee 0.18 µm ilaa 8.0 μm, Calcium fluoride waxay soo bandhigaysaa index refractive hooseeya oo ka duwan 1.35 ilaa 1.51 waxaana badanaa loo isticmaalaa codsiyada u baahan gudbinta sare ee kala duwanaanta infrared iyo ultraviolet, waxay leedahay index refractive ee 1.42 µmCaF2 sidoo kale si cadaalad ah kiimikaad ahaan waa mid aan firfircoonayn waxayna bixisaa adkeysi ka sarreeya marka loo eego barium fluoride, iyo ina-adeerada magnesium fluoride.Heerkeeda waxyeellada laysarka ee aadka u sarreeya ayaa ka dhigaysa mid faa'iido leh in lagu isticmaalo leysarka excimer.Paralight Optics waxa ay bixisaa Calcium Fluoride (CaF2) lenses bi-concave ah oo leh dahaarka lidka-milicsiga ee cabbirka hirarka dhererka 3 ilaa 5 µm.Dahaarkani wuxuu si weyn u yareynayaa celceliska milicsiga substrate-ka in ka yar 2.0%, taasoo keenaysa gudbin celcelis sare oo ka badan 96% dhammaan noocyada daahan AR.Ka eeg jaantusyada soo socda tixraacyadaada.