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Lanthanum fluoride single crystal, and optical component

An optical component, lanthanum fluoride technology, applied in optical components, optics, single crystal growth, etc., can solve the problems of difficult adjustment of optical axis, deterioration of beam diameter, etc., and achieve the effect of high infrared transmittance

Inactive Publication Date: 2017-12-01
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method of using a reflector, there are problems such as the difficulty in adjusting the optical axis and the deterioration of the beam diameter due to the increase in the size of the laser processing machine, and an alternative method and material have been sought.

Method used

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  • Lanthanum fluoride single crystal, and optical component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (training preparation)

[0054] use figure 1 The crystal manufacturing apparatus shown grows a single crystal of lanthanum fluoride doped with an alkaline earth metal. As raw materials, barium fluoride and lanthanum fluoride with a purity of 99.99 vol. % were used. The crucible 1, the seed crystal extraction rod 2, the heater 4, the heat insulating material 5, the top plate 6 and the holder 7 are made of high-purity carbon.

[0055] First, 94 g of barium fluoride and 2000 g of lanthanum fluoride were weighed, mixed well, and filled into crucible 1 . A crucible 1 filled with raw materials, a seed crystal removal rod 2, a heater 4, a heat insulating material 5, a top plate 6 and a support 7 are as follows figure 1 Set as shown.

[0056] (heating and drying process inside the device)

[0057] Next, use a vacuum exhaust device consisting of an oil rotary pump and an oil diffusion pump to perform vacuum exhaust until the inside of the furnace is 5.0×10 -4 Pa. Simult...

Embodiment 2

[0067] In the process of preparation for cultivation, 18 g of barium fluoride and 1982 g of lanthanum fluoride were weighed respectively, except that, crystal cultivation was carried out in the same manner as in Example 1, a sample for spectrum measurement was prepared, and a transmittance measurement of 9.3 μm was carried out ( Table 1). The obtained crystal was subjected to SEM / EDS analysis, and it was confirmed that 2.23 mol% of barium was contained in the crystal.

Embodiment 3

[0069] In the process of preparation for cultivation, except that 181 g of barium fluoride and 1819 g of lanthanum fluoride were weighed separately, crystal growth was carried out in the same manner as in Example 1, and a sample for spectrum measurement was prepared, and a transmittance measurement of 9.3 μm was carried out (Table 1). 1). The obtained crystal was subjected to SEM / EDS analysis, and it was confirmed that 8.54 mol % of barium was contained in the crystal.

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Abstract

Provided are: lanthanum fluoride single crystals characterized in that an alkaline earth metal is added, and the internal transmittance of light of a wavelength of 9.3 [mu]m is 85% / mm or greater, the lanthanum fluoride single crystals having high permeability in the infrared region, and it being possible to suitably use the lanthanum fluoride single crystals in laser phase plates, in lenses of laser processing machines, gas detectors, flame detectors, infrared cameras, and the like, and in optical window materials, etc.; and optical components.

Description

technical field [0001] The present invention relates to a lanthanum fluoride single crystal that can be suitably used for phase plates for lasers, lenses for laser processing machines, gas detectors, flame detectors, infrared cameras, etc., optical window materials, and the like. Background technique [0002] Infrared window materials are materials that contribute to cutting-edge technology, and in recent years, the development of window materials that transmit longer-wavelength infrared light has been advanced. [0003] In particular, infrared lasers such as carbon dioxide gas lasers are used in the processing of automobile parts and steel due to their low attenuation in the atmosphere. In the carbon dioxide gas laser used in the current laser processing machine, due to the difference between p-polarized light and s-polarized light, it can be seen that it affects cutting processing. [0004] In order to control the degree of polarization of the laser beam, a reflective pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12G02B1/02
CPCC30B29/12C30B15/00C30B27/02G02B1/02G01N27/4074G01T1/2935
Inventor 石津澄人福田健太郎松尾健太郎
Owner TOKUYAMA CORP