Qhov sib txawv tseem ceeb ntawm ib nrab nthwv dej phaj thiab lub quarter yoj phaj yog tias ib nrab nthwv dej phaj nyiam hloov cov kev taw qhia polarization ntawm linearly polarized lub teeb, whereas lub quarter yoj phaj nyhav hloov lub teeb linearly polarized rau hauv lub voj voog polarized.
Wave phaj lossis lub retarder tuaj yeem txhais tau tias yog ib qho khoom siv kho qhov muag uas tuaj yeem hloov pauv lub xeev polarization ntawm lub teeb nthwv dej uas taug kev los ntawm nws. Feem ntau, yoj phaj yog tsim los ntawm cov khoom siv sib txawv xws li quartz, mica, lossis yas. Ntawm no, qhov Performance index ntawm refraction ntawm lub teeb linearly polarized txawv ntawm qhov ntawm ob qho tib si perpendicular siv lead ua axes. Muaj ob hom yoj daim hlau: ib nrab-yoj phaj thiab lub quarter-yoj phaj.
Half Wave Plate yog dab tsi?
Ib nrab nthwv dej phaj nyiam hloov cov kev taw qhia polarization ntawm linearly polarized teeb. Thaum xav txog lub teeb pom kev zoo, ib nrab nthwv dej phaj hais txog cov nyhuv ntawm ib nrab nthwv dej phaj uas tig lub polarization vector ntawm lub kaum sab xis ntawm 2θ. Txawm li cas los xij, yog tias peb xav txog lub teeb elliptical polarized, ib nrab yoj phaj qhia tau hais tias cov nyhuv ntawm inverting lub handedness ntawm lub teeb.
Daim duab 01: Ib Nrab Wave Phaj
Rau ib nrab nthwv dej phaj, peb tuaj yeem siv kev sib raug zoo ntawm L (thickness ntawm cov siv lead ua), Δn (birefringence, ob chav refraction ntawm lub teeb nyob rau hauv pob tshab, molecularly xaj khoom), thiab λ 0 (nqus wavelength ntawm lub teeb). Kev sib raug zoo yog raws li nram no:
Г=2πΔnL/ λ0
Г yog tus nqi ntawm cov txheeb ze theem. Rau ib nrab nthwv dej phaj, theem hloov pauv ntawm cov khoom siv polarization tuaj yeem muab tau raws li Г=π.
Qib Quarter Wave Plate yog dab tsi?
Ib lub hlis twg yoj phaj hloov lub teeb pom kev zoo ib puag ncig rau hauv lub teeb pom kev zoo thiab rov ua dua. Hom yoj phaj no muaj txiaj ntsig hauv kev tsim cov elliptical polarization ib yam nkaus.
Daim duab 02: Ob Nthwv dej uas sib txawv ntawm ib leeg los ntawm ib lub quarter-phase ua haujlwm rau ib qho axis
Nyob rau hauv hom yoj phaj no, lub polarization ntawm cov photon nkag tau raug daws ua ob lub polarization ntawm x thiab y axis. Ntxiv mus, nyob rau hauv hom yoj phaj no, lub input polarization yog parallel mus rau lub ceev los yog qeeb axis. Qhov no ua rau tsis muaj polarization ntawm lwm axis; yog li, cov zis polarization zoo ib yam li cov khoom siv. Yog hais tias lub input polarization yog li ntawm 45 degrees mus rau qhov ceev thiab qeeb axis, polarization nyhav sib npaug ntawm cov axes.
Qhov txawv ntawm Ib Nrab Wave Phaj thiab Quarter Wave Phaj yog dab tsi?
Wave phaj tuaj yeem txhais tau tias yog ib qho khoom siv kho qhov muag uas tuaj yeem hloov pauv lub xeev polarization ntawm lub teeb nthwv dej uas taug kev los ntawm nws. Qhov sib txawv tseem ceeb ntawm ib nrab yoj phaj thiab lub quarter yoj phaj yog tias ib nrab nthwv dej phaj nyiam hloov cov kev taw qhia polarization ntawm linearly polarized lub teeb, whereas lub quarter yoj phaj nyiam hloov linearly polarized nqa mus rau hauv lub voj voog polarized. Tsis tas li ntawd, nyob rau hauv ib nrab nthwv dej phaj, qhov sib txawv ntawm ob lub dav hlau polarized nthwv dej yog tus nqi ntawm pi, whereas nyob rau hauv lub quarter yoj phaj, nws yog ib nrab ntawm tus nqi pi.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm ib nrab yoj phaj thiab lub quarter yoj phaj nyob rau hauv daim ntawv tabular rau ib sab sib piv.
Summary – Ib Nrab Wave Phaj vs Quarter Wave Phaj
Wave phaj yog cov khoom siv kho qhov muag uas tuaj yeem hloov pauv lub xeev polarization ntawm lub teeb nthwv dej uas taug kev los ntawm nws. Muaj ob hom yoj daim hlau: ib nrab-yoj phaj thiab lub quarter yoj phaj. Qhov sib txawv tseem ceeb ntawm ib nrab yoj phaj thiab lub quarter yoj phaj yog tias ib nrab nthwv dej phaj nyiam hloov cov kev taw qhia polarization ntawm linearly polarized lub teeb, whereas lub quarter yoj phaj nyiam hloov linearly polarized nqa mus rau hauv lub voj voog polarized.
