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

Inactive Publication Date: 2007-09-12
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Use of double refraction crystal of borate system
  • Use of double refraction crystal of borate system
  • Use of double refraction crystal of borate system

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

This invention relates to a birefringent optical crystal of borate series and its use: the chemical formula of this birefringent crystal of borate series is: ReBa3B9O18(Re=Y, Pr, Nd, Sm, Eu, Gd, Tb, Er, Dy, Ho, Tm, Yb and/or Lu).These crystals are negative uniaxial crystal, and its refractive index on Dual-band visible light in the numerical size of about 0.08-0.15. This series of crystal easy cutting, grinding, polishing and preservation, do not dissolve in water, not deliquescence, be stability in the air, suitable for production of optical communications components, such as optical isolator, toroid, beam displacement, optical polarizer and optical modulators, etc. Particularly for the production of the various used for polarizing prisms, phase delay devices and electro-optical modulation devices, and so on. These devices use of the refractive index is crystal characteristics, in particular the larger dual refractive index.

Description

technical field [0001] The invention relates to the field of birefringent optical crystals, in particular to a borate-based ReBa 3 B 9 o 18 Birefringent crystals (Re=Y, Pr, Nd, Sm, Eu, Gd, Tb, Er, Dy, Ho, Tm, Yb and / or Lu) and uses thereof. Background technique [0002] Birefringence is one of the important characteristics of light propagating in optical heterogeneous crystals. When light propagates in an optical heterogeneous body (such as: crystals other than cubic crystal system), except for a few special directions (along the direction of the optical axis), its vibration characteristics will be changed, and it will be decomposed into two electric field vectors. Two beams of polarized light with different propagation speeds and different refractive indices are perpendicular to each other. This phenomenon is called birefringence, and such crystals are called birefringent crystals. One of the two beams of light obeys the general law of refraction, called ordinary light ...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B1/02
Inventor 陈小龙何明王皖燕蔡格梅许燕萍刘军
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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