𝑛𝑛2 − 1 = (A+B [𝑇𝑇2−𝑇𝑇20]) +Dλ2 /λ2−(λ1+C [𝑇𝑇2−𝑇𝑇20])2 + λ2−λ22 where wavelength λ is expressed in μm, To = 295.15 K, A = 2.07156, B = 6.273× 10-8, λ1 = 0.091293, C = –1.9516 × 10-8, D = 5.62675, and λ2 = 18.5533. The slope dn/dT varies with λ and T, but has the approximate value 1.4 × 10-5 K-1 in the range 296–498 K. |
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Refractive index
Crystals
Sapphire
Prisms
Principal component analysis
Wavefronts
Electrons