Method and device for separating optical crystal by using two laser beams

An optical crystal, laser beam technology, applied in laser welding equipment, metal processing equipment, welding equipment and other directions, to achieve the effect of eliminating pollution damage

Active Publication Date: 2011-08-17
武汉飞能达激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above problems in the mechanical cutting process of KDP optical crystals, the present invention provides a dual laser beam separation optical A crystal method, which achieves the goal

Method used

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  • Method and device for separating optical crystal by using two laser beams
  • Method and device for separating optical crystal by using two laser beams
  • Method and device for separating optical crystal by using two laser beams

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example 1

[0044] The present invention adopts a pulse width of 50fs, a wavelength of 800nm, and a maximum pulse peak power of 4×10 11 W. A femtosecond pulse laser with a maximum single pulse energy of 2mJ is used as a high peak power, low energy ultrashort pulse laser beam and a YLR-50 model fiber laser, with an output wavelength of 1070nm, an output peak laser power of 50W, and a pulse energy of 1J As a low peak power, high energy laser beam, the focused spot diameters are 10 μm and 50 μm respectively, and the separated KDP sample size is 60 mm in length and 11.18 mm in thickness. Experimental method: One of the specific implementations of KDP optical crystals is separated by double laser beams, the pulse energy of the femtosecond laser is adjusted to 1mJ, and the pulse peak power is 2×10 11 W, scanning speed 0.6m / min. The output peak power of the fiber laser is 50W, the pulse energy is 1J, and the scanning speed is 1m / min. Experimental results: The optical crystal is separated along...

example 2

[0046] The present invention adopts the UVP266-0.25 type picosecond ultraviolet laser, the output wavelength is 266nm, the pulse width is 15ps, the maximum output single pulse energy is 250nJ, and the highest pulse peak power is 1.7×10 11 The W ultraviolet laser is used as a high peak power, low energy ultrashort pulse laser beam and the YLM-200 model fiber laser, the output wavelength is 1070nm, and the output continuous laser power is 200W as a low peak power, high energy laser beam, and the focus spot diameter is respectively 6μm and 80μm, the size of the separated KDP sample is 40mm in length and 55mm in thickness. Experimental method: using double laser beams to separate KDP optical crystals Specific implementation mode 2, adjusting the output pulse energy of the ultraviolet laser to 40nJ, and the pulse peak power to 2.6×10 4 W, scanning speed 0.3m / min, fiber laser output power 175W, scanning speed 1.8m / min. Experimental results: The optical crystal is separated along th...

example 3

[0048] The present invention adopts the Awave-532-20-25K type picosecond green laser, the output wavelength is 532nm, the pulse width is 12ps, the maximum output single pulse energy is 40μJ, and the highest pulse peak power is 3×10 7 W is used as a high peak power, low energy ultrashort pulse laser beam, the diameter of the focused spot is 10 μm, and the YLR-6000-QCW model fiber laser is used, the output wavelength is 1070nm, and the maximum peak power of the output laser is 6×10 3 W, the pulse energy is 50J as a low peak power, high energy laser beam, the line focus area is 1mm 2 , The size of the separated KDP sample 1 is 98mm in length and 100mm in thickness. Experimental method: One of the specific implementations of KDP optical crystals is separated by double laser beams, the pulse energy of the picosecond laser is adjusted to 40 μJ, and the peak power of the pulse is 3×10 6 W, scanning speed 1.5m / min. Fiber laser output power is 6×10 3 W, the pulse energy is 50J, and ...

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Abstract

The invention discloses a method and a device for separating an optical crystal by using two laser beams. The method comprises the following steps of: forming a damage section formed by light damage lines in the optical crystal by using a first laser beam with high peak power and low pulse energy; and acting on the damage section formed by the light damage lines by using a second laser beam with low peak power and high pulse energy so as to separate the optical crystal. The device comprises a two-dimensional working table and two sets of laser processing systems; each laser processing system comprises a Z-axis moving mechanism, and a laser, a beam expansion collimating lens, a first reflection lens and a focusing lens which are positioned on the same light path; and the focusing lenses are fixed on the Z-axis moving mechanisms. In the invention, the optical crystal is separated by using the characteristics that a mechanical action force is absent in the mutual action between the laser and the material, and the material is transparent to laser; therefore, aims of no fragmentation, high separating precision, arbitrary direction separation and no pollution during separation of the optical crystal can be fulfilled. The invention is particularly applicable to separation of potassium dihydrogen phosphate (KDP) optical crystals.

Description

technical field [0001] The invention belongs to the technical field of laser processing applications, and in particular relates to a method and a device for separating optical crystals with double laser beams. The method is especially suitable for potassium dihydrogen phosphate (KDP) optical crystals. Background technique [0002] KDP optical crystal is a kind of artificial optical crystal cultivated in aqueous solution, which belongs to tetragonal optical crystal. Optical crystals belonging to this type include ADP (ammonia dihydrogen phosphate), KD * P (dideuterium potassium phosphate) and so on. Potassium dihydrogen phosphate (KDP) is easy to grow into large uniform optical crystals, has high transparency in the wavelength range of 0.2-2.5 μm, and has a high anti-laser damage threshold, so it is widely used in optoelectronic technology and is a high-power The frequency multiplier in the driver and the important material of electro-optic devices have been widely used in ...

Claims

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Application Information

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IPC IPC(8): B23K26/40B23K26/064B23K26/402
Inventor 段军胡乾午李祥友王泽敏曾晓雁刘建国高明
Owner 武汉飞能达激光技术有限公司
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