Use of double refraction crystal of borate system
A birefringent crystal, borate technology, applied in optics, instruments, optical components, etc., can solve the problem of not getting valuable crystal samples
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Embodiment 1
[0021] Example 1 ErBa 3 B 9 o 18 Crystal Refractive Index Test
[0022] Figure 3 lists the refractive index test results for 8 different wavelengths in the visible range from violet to red. The test results showed that ErBa 3 B 9 o 18 The crystal is negatively uniaxial, with a birefringence of about -0.11 in the visible wavelength range. The refractive index of violet ordinary light (404.7nm) is 1.7327, the refractive index of red ordinary light (656.3nm) is 1.7059, and its dispersion n 紫 -n 红 = 0.0268.
[0023] ErBa 3 B 9 o 18 The refractive index-dispersion equation of crystal can be expressed by the four-parameter Sellmeier equation:
[0024]
[0025] In the formula, λ represents the wavelength in vacuum (A), and n is the refractive index. The fitting results of the coefficients in the above formula are shown in Figure 4 at 295K. Using this equation, the refractive index value can be calculated within a certain wavelength range.
Embodiment 2
[0026] Example 2 YBa 3 B 9 o 18 Crystal Refractive Index Test
[0027] Figure 5 lists the refractive index test results for 8 different wavelengths in the visible range from violet to red. The test results showed that YBa 3 B 9 o 18 The crystal is negatively uniaxial, with a birefringence of about -0.12 in the visible wavelength range. The refractive index of violet ordinary light (404.7nm) is 1.7291, the refractive index of red ordinary light (656.3nm) is 1.7000, and its dispersion n 紫 -n 红 = 0.0291.
[0028] YB 3 B 9 o 18 Refractive Index-Dispersion Equation of Crystal: Four-parameter Sellmeier Equation
[0029]
[0030] In the formula, λ represents the wavelength in vacuum (A), and n is the refractive index. The fitting results of the coefficients in the above formula are shown in Figure 6 at 295K. Using this equation, the refractive index value can be calculated within a certain wavelength range.
Embodiment 3
[0031] Example 3 NdBa 3 B 9 o 18 Crystal Refractive Index Calculation
[0032] The large refractive index of this series of borates comes from the group B 3 o 6 optical anisotropy. B 3 o 6 by 3 BOs 3 group constitutes, while BO 3 The polarization of the group parallel to the plane and perpendicular to the plane under the action of an external electric field is very different. According to Wooster's rule, all crystals with layered structure, if they do not contain OH groups, are crystals with negative optical axis. Please refer to the literature [Wooster, W.A. 1931, Zeit. Using Bragg's theoretical calculation on the refractive index, refer to [Ye Danian, Structural Optical Mineralogy, Geological Press, 1998] to calculate NdBa 3 B 9 o 18 Crystal Refractive Index, n e In the range of 1.58-1.62, n o In the range of 1.70-1.73, it is still a negative uniaxial crystal, and the birefringence is in the range of 0.1-0.13.
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