▁greater ▁than ▁ 1 ▁G W / cm 2 ▁are ▁commer cially ▁available . ▁ ▁See ▁also ▁G lan – F ou ca ult ▁pr ism ▁G lan – Th om pson ▁pr ism ▁ ▁References ▁ ▁Category : Pol ar ization ▁( w aves ) ▁Category : P ris ms <0x0A> </s> ▁Pho eb e ▁L ank ester ▁( also ▁P he be ▁L ank ester , ▁ 1 0 ▁April ▁ 1 8 2 5 ▁– ▁ 9 ▁April ▁ 1 9 0 0 ) ▁was ▁a ▁British ▁botan ist ▁known ▁for ▁her ▁popular ▁science ▁writing , ▁particularly ▁on ▁wild flow ers , ▁par as it ic ▁plants , ▁and ▁f ern s . ▁Her ▁writing ▁incorpor ated ▁both ▁technical , ▁high - level ▁text ▁and ▁writing ▁accessible ▁to ▁the ▁lay ▁reader . ▁ ▁Family ▁She ▁was ▁born ▁Pho eb e ▁Pope ▁in ▁High bury ▁to ▁a ▁former ▁Manchester ▁mill ▁owner ▁and ▁his ▁wife . ▁She ▁had ▁one ▁brother . ▁In ▁ 1 8 4 5 , ▁she ▁married ▁the ▁natural ist ▁Ed win ▁L ank ester , ▁with ▁whom ▁she ▁had ▁eight ▁children . ▁Her ▁son ▁Ray ▁became ▁a ▁zo ologist . ▁ ▁Writing ▁L ank ester ▁published ▁under ▁the ▁name ▁Mrs . ▁L ank ester . ▁Her ▁books ▁combined ▁scientific ▁rig or ▁with ▁interesting ▁information ▁about ▁traditional ▁medic inal ▁uses ▁of ▁plants . ▁She ▁also ▁lect ured ▁on ▁science ▁and ▁wrote ▁a ▁synd ic ated ▁column ▁on ▁women ' s ▁topics ▁that ▁ran ▁in ▁provincial ▁newsp apers . ▁▁