Self-frequency doubling laser crystal Nd-doped calcium niobate

A laser crystal, neodymium calcium niobate technology, applied in the direction of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of only reaching the conversion efficiency, long period, low light damage threshold, etc.

Inactive Publication Date: 2006-10-18
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In the 1960s, Johnson et al. mixed Tm 3+ LiNbO 3 On the same crystal, the self-frequency doubling laser output from 1853nm to 927nm is realized, but the conversion efficiency only reaches 10 -6 Order of magnitude [L.F. Johnson and A.A. Ballman, J. Appl. Phys., 40 (1969) 297]
In the application of nonlinear optics, although the performance of potassium niobate is very good, the growth of potassium niobate is difficult, and due to the growth of molten salt method, there is a problem that the cycle is relatively long
Lithium niobate can be grown by pulling method, but because of its low optical damage threshold, it is rarely used in the field of nonlinear optics, but mainly used in electro-optic modulation, holography, optical storage technology and other fields

Method used

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Experimental program
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Embodiment 1

[0018] Embodiment 1: about the synthesis of neodymium-doped calcium niobate raw material

[0019] We use the solid state method to sinter at high temperature (1050°C), and the chemical reaction equation is as follows:

[0020]

[0021] The chemical reagents used and their manufacturers are as follows:

[0022] CaCO 3 Analytical purity 99% Shanghai Silian Chemical Factory

[0023] Nb 2 o 5 Analytical purity 99.99% China National Pharmaceutical Group Shanghai Chemical Reagent Company

[0024] Nd 2 o 3 Analytical purity 99.99% Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

[0025] The feeding amount of these three kinds of reagents is as follows:

[0026] CaCO 3 95.086 grams

[0027] Nb 2 o 5 132.905 grams

[0028] Nd 2 o 3 11.216 grams

[0029]The specific steps are: weigh the reagents according to the above dosage, put them into a mortar, mix them and grind them carefully, use a plexiglass mold of φ45×40mm to pr...

Embodiment 2

[0030] Embodiment 2: About the growth of neodymium-doped calcium niobate single crystal

[0031] The pull method is adopted, the medium frequency induction heating furnace is used, and the temperature is controlled by Yuguang 708P temperature controller. The specific operation steps are: put the iridium gold crucible containing the raw materials in the pulling furnace, heat up to 1600°C to melt the raw materials, keep the temperature for about half an hour, first use the iridium gold wire as the seed crystal for pulling growth, and use the obtained Cut the seed crystal of the crystal, and then carry out the second growth to obtain a single crystal with relatively good quality. The conditions for growing the crystal are that the pulling speed is 1 mm / hour, the rotation speed is 10 rpm, and the growth atmosphere is nitrogen atmosphere. Using this method, a single crystal of Nd-doped calcium niobate can be obtained with a diameter of φ25×40mm.

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Abstract

The present invention relates to artificial crystal, and is especially one kind of self-frequency doubling laser crystal, Nd:Ca2Nb2O7 crystal, and its preparation process. By means of Czochralski process in the conditions of growing temperature 1600 deg.c, pulling speed 0.5-2 mm / hr and rotation speed 5-20 rpm, high quality and large size Nd:Ca2Nb2O7 crystal may be obtained. As one new kind of laser crystal, the Nd:Ca2Nb2O7 crystal can output laser beam of wavelength or self-frequency doubling green laser beam of wavelength 534 nm. The laser of Nd:Ca2Nb2O7 crystal may find its wide application in spectroscopy, biomedicine, military and other fields.

Description

technical field [0001] The self-frequency doubling laser crystal neodymium-doped calcium niobate belongs to the technical field of optoelectronic materials, and in particular relates to a self-frequency doubling laser crystal as a laser working material in a solid-state laser. Background technique [0002] Frequency doubling is a method often used in laser technology to change the output wavelength of laser beams. It usually uses a special nonlinear optical crystal placed in front of the laser beam to change the output wavelength of the laser beam. Concentrating the two technologies of laser oscillation and frequency doubling on the same crystal to obtain self-frequency doubling laser has been the goal pursued by scientists for a long time. [0003] In the 1960s, Johnson et al. mixed Tm 3+ LiNbO 3 On the same crystal, the self-frequency doubling laser output from 1853nm to 927nm is realized, but the conversion efficiency only reaches 10 -6 Order of magnitude [L.F. Johnso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B15/00
Inventor 龙西法韩秀梅
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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