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Wavelength conversion element, laser light source, two-dimensional image display and laser processing system

A technology of wavelength conversion components and laser light sources, which is applied in the directions of optics, crystal growth, single crystal growth, etc., can solve the problems of multiplication of parts, complex structure, increase of wavelength conversion components, etc., and achieve stable output characteristics and prevent damage.

Inactive Publication Date: 2008-07-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, there is a problem that the number of wavelength conversion elements increases, and the structure becomes complicated, and the number of parts also doubles.
[0012] However, the actual status quo is that even if magnesium oxide is doped within the above range, the damage and deterioration of the crystal cannot be completely suppressed, especially when the high-order harmonics of several W-level high output are obtained, the crystal damage cannot be suppressed. damage and deterioration

Method used

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  • Wavelength conversion element, laser light source, two-dimensional image display and laser processing system
  • Wavelength conversion element, laser light source, two-dimensional image display and laser processing system
  • Wavelength conversion element, laser light source, two-dimensional image display and laser processing system

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no. 1 Embodiment approach

[0072] The wavelength conversion element according to the first embodiment of the present invention uses, as a nonlinear optical crystal for wavelength conversion, a lithium niobate crystal doped with magnesium oxide (MgO) in a solid-liquid ratio, and converts infrared light into green light. Next, the wavelength conversion element will be described in detail.

[0073] Lithium niobate used in this embodiment is produced, for example, by the Czochralski method, which is a type of crystal growth method. Next, a method for producing magnesium oxide (MgO)-doped lithium niobate will be described.

[0074] First, weigh lithium carbonate (Li 2 CO 3 ), niobium oxide (Nb 2 o 5 ) and magnesium oxide (MgO), temporarily sintered at 1100°C for 10 hours. At this time, the molar ratio of MgO doping amount is determined by MgO / (LiNbO 3 +MgO) decision. The Mg concentration (Mg content ratio) of the crystals was set at 5.00 mol%, 5.30 mol%, 5.60 mol%, 5.80 mol%, 6.00 mol%, and 6.50 mol%...

no. 2 Embodiment approach

[0103] The wavelength conversion element according to the second embodiment of the present invention uses, as a nonlinear optical crystal for wavelength conversion, a lithium tantalate crystal doped with magnesium oxide (MgO) in a solid-liquid ratio and converts infrared light into green. Light. Next, the present wavelength conversion element will be described in detail.

[0104] Lithium tantalate used in this embodiment is produced by the same method as in the first embodiment. Assuming that the Mg concentration (Mg content ratio) of the crystal is 1.0mol%, 3.0mol%, 5.0mol%, 5.3mol%, 5.6mol%, 6.0mol%, 7.0mol% when the crystal is lifted out %, 10.0 mol%.

[0105] First, for Mg-doped LiTaO as a crystal substrate 3 Crystal composition is discussed. LiTaO 3 Crystals are classified into a composition with a solid-liquid ratio and a stoichiometric composition according to the ratio of Li to Ta (Li / Ta ratio). The crystal with stoichiometric composition, whose Li / Ta ratio is ba...

no. 3 Embodiment approach

[0136] Next, a laser light source device using the wavelength conversion element according to the third embodiment of the present invention will be described with reference to FIG. 21 . In FIG. 21 , the fundamental wave 84 emitted from a light source 86 as a coherent light source passes through a converging optical system 85, and is converted into SHG 83 by wavelength conversion by nonlinear optical crystals 81 and 82 as wavelength conversion elements. . According to this configuration, a high-efficiency and high-output wavelength conversion element can be realized. In addition, as the light source 86 of the fundamental wave 84, a solid-state laser light source, a fiber laser light source, etc. can also be utilized. The fiber laser light source has a high beam quality, so it is easier to perform wavelength conversion with a single path structure. By combining it with the wavelength conversion element of this embodiment, a high-efficiency short-wavelength light source device c...

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Abstract

The wavelength conversion element includes a substrate having a nonlinear optical single crystal that periodically inverts the polarization structure. When ultraviolet light is irradiated on the substrate, the visible light transmittance of the substrate is 85% or more. The laser beam with a wavelength of 640nm to 2000nm is shortened to output a laser beam with an average output of 1W or more. In this way, by improving the visible light transmission characteristics when irradiated with ultraviolet light, it is possible to prevent damage to the crystal and achieve high output stability of output characteristics. As a result, the absorption of green light by ultraviolet light can be suppressed, making it possible to avoid saturation of the output and damage to the crystal.

Description

technical field [0001] The present invention relates to a wavelength conversion element using a nonlinear optical crystal for optical wavelength conversion, a laser light source device, a two-dimensional image display device and a laser processing device. Background technique [0002] High-output laser light sources are attracting attention as light sources used in laser processing equipment, laser displays, and the like. In the infrared field, solid-state lasers such as YAG lasers, fiber lasers using fibers doped with rare earths (rare earths) such as Yb and Nd, and the like have been developed. In the red and blue fields, semiconductor lasers using gallium arsenide, gallium nitride, etc. have been developed, and higher output has also been studied. [0003] On the other hand, in the green field, it is still difficult to directly generate green light from semiconductors. Generally, nonlinear optical crystals are used to convert the wavelength of infrared light emitted from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/37
CPCC30B15/00C30B29/30G02F1/3551G02F1/3558G02F1/37G02F2202/20G02F2203/21
Inventor 古屋博之森川显洋水内公典山本和久门胁慎一
Owner PANASONIC CORP
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