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It says in the introduction: "high-temperature α phase and low-temperature β phase" but in the first section: "the low-temperature alpha phase converts into the beta phase upon heating to 925 °C" My understanding is that the former is correct. Is that right? — Preceding unsigned comment added by Oliford (talkcontribs) 07:46, 15 February 2012 (UTC)[reply]

Corrected, thanks (something got mixed up while merging two articles). Yes, beta is low-T phase. Materialscientist (talk) 07:56, 15 February 2012 (UTC)[reply]

Do you know if the α and β have the same indices and Sellmeier coefficients? We have different coefficients for α and β but the coefficients for β seem to match the behavior of some samples in our lab, which were ordered as α-BBO. The supplier insists that the indices are 'nearly' the same.

These are the coefficients I have from a few sources. n^2 = a1 + a2/(l^2 - a3^2) - a4*l^2.

Beta, from United Crystals: (These agree with our measurements, and we think we have α-BBO)

a1 a2 a3 a4
no 2.7359 0.01878 0.01822 0.01354
ne 2.3753 0.01224 0.01667 0.01516

Alpha from AG Optics:

no 2.7471 0.01878 0.01822 0.01354
ne 2.3753 0.01224 0.01667 0.01516 <--- Looks like these are from Beta

Alpha. I'm not sure of the original source for these, but they came to us via CMOD of MIT:

no 2.7471 0.01878 0.01822 0.01354
ne 2.3174 0.01224 0.01667 0.01516

Can anyone shed any light on this?

Oliford (talk) 05:22, 28 February 2012 (UTC)[reply]

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