Double beam coupling device

A dual-beam coupling and laser technology, applied in optics, optical components, laser welding equipment, etc., can solve the problems of high price and inability to obtain welding effects, improve production efficiency and quality, improve welding efficiency and welding quality, overcome difficult effect

Inactive Publication Date: 2012-06-20
SHENZHEN GDLASER TECH CO LTD
6 Cites 14 Cited by

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Problems solved by technology

Metals such as gold, silver, and copper are expensive, and using an achromatic combination lens to co...
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Abstract

The invention discloses a double beam coupling device, which includes a collimation system used for collimating Nd:YAG laser and enabling the collimated laser beam to form a beam of parallel light, a first 45-degree reflector used for reflecting and changing the transmission direction of the Nd:YAG laser, a beam expanding system used for expanding the Nd:YAG frequency-doubled laser and obtaining light beams with different divergence angles, a second 45-degree reflector used for changing the transmission direction of the Nd:YAG frequency-doubled laser through the Nd:YAG laser and reflection, and a focusing system used for coupling and focusing the Nd:YAG laser and the Nd:YAG frequency-doubled laser to one position. The device overcomes the difficulty in welding processing by adopting the single Nd:YAG laser, and greatly improves the welding efficiency and the welding quality.

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  • Double beam coupling device
  • Double beam coupling device
  • Double beam coupling device

Examples

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Example Embodiment

[0014] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0015] figure 1 It is a simplified schematic diagram of a device for coupling and focusing two lasers of different wavelengths according to an embodiment of the present invention. The coupling device includes: a collimating system 11 to collimate the Nd:YAG laser beam 1 into an almost parallel laser beam; a first 45-degree reflecting mirror 12 to reflect the Nd:YAG laser beam 1 with small loss to transmit it The direction is changed by 90 degrees; the beam expansion system 13, which expands the Nd:YAG frequency doubled laser beam 2 into a beam with a certain divergence angle; the second 45-degree mirror 14 is used to pass the Nd:YAG laser beam 1 with small loss , And reflect the Nd:YAG frequency doubled laser beam 2 with small loss, so that the transmission direction of the Nd:YAG frequency doubled laser beam 2 is changed by 90 degrees; the focusing system 15 is used to couple and focus the Nd:YAG laser beam 1 and Nd:YAG The frequency doubled laser beam 2 makes the two laser beams focus on the same position of the workpiece 16 to be processed.
[0016] In order to transmit laser light with low loss, it is required that the optical glass of the collimating system 11 is coated with a dielectric film that is highly transparent to the Nd:YAG laser beam 1; the optical glass of the beam expansion system 13 is coated with a frequency doubled laser beam for Nd:YAG 2 High-transmittance dielectric film; the reflective surface of the first 45-degree reflector 12 is coated with a dielectric film that is highly reflective to the Nd:YAG laser beam 1 (incident angle is 45 degrees); the mirror surface of the second 45-degree reflector 14 It is coated with a dielectric film that is highly transparent to Nd:YAG laser beam 1 (incidence angle of 45 degrees) and highly reflective to Nd:YAG frequency doubled laser beam 2 (incident angle of 45 degrees). The two surfaces of the optical glass of the focusing system 15 are coated with dielectric films that are highly transparent to the Nd:YAG laser beam 1 and the frequency-doubled laser beam 2 of Nd:YAG.
[0017] In this embodiment, the laser beam 1 is a Nd:YAG laser with a wavelength of 1.064 microns, and the laser beam 2 is a Nd:YAG laser with a wavelength of 532 nm. By changing the relative position of the optical glass in the beam expansion system 13, the laser beam 2 is expanded into a beam with a certain divergence angle, so that the focal position of the laser beam 1 after being focused by the focusing system is the same. Personnel with laser technology can easily adjust the laser beam 1 and laser beam 2, and change the optical coatings on the collimating system 11, the beam expanding system 13, the first 45-degree reflector 12 and the second 45-degree reflector 14, thereby Achieve the same coupling focusing effect. Similarly, change the wavelengths of the laser beam 1 and the laser beam 2, and change the optical coatings on the collimating system 11, the beam expanding system 13, the first 45 degree reflector 12, the second 45 degree reflector 14 and the focusing system 15, It can also easily achieve the purpose of coupling and focusing two lasers with different wavelengths. figure 1 What is described is the principle of coupling two lasers with different wavelengths, which should not limit the protection scope of the present invention.
[0018] figure 2 It is a simplified schematic diagram of a device that couples two lasers of different wavelengths and uses an achromatic combined lens to focus. The laser beam 1 is collimated by the collimating system 11 into an almost parallel laser beam, reflected by the first 45-degree reflector 12 and then passed through the second 45-degree reflector 14, and finally focused by the achromatic combination lens 21 to the workpiece 16 on. The laser beam 2 is collimated by the collimating system 13 into an almost parallel laser beam, reflected by the second 45-degree reflecting mirror 14, and finally focused on the workpiece 16 by the achromatic combination lens 21. Although the achromatic combination lens is used, the distance between the two focal points of the laser beam 1 and the laser beam 2 after being focused by the achromatic combination lens 21 is greatly reduced, but there is still a focal length difference Δf. When precision processing and processing of expensive gold, silver, copper and other metals are required, the focal length difference still cannot meet the processing requirements. To reduce the focal length difference to zero, the number of combined lens optical glass must be increased, but this greatly increases the cost. figure 1 By changing the relative position of the optical glass in the beam expansion system 13, the laser beam 2 is expanded into a laser beam with a suitable divergence angle, which is coupled and focused by a single focusing lens, and its focal position is the same as the focal position of the laser beam 1. The requirements for focus are met and costs are reduced.
[0019] Figure 3a , Figure 3b It is a simplified schematic diagram of the device for collimating or beam expanding the laser light coupled out from the optical fiber in this embodiment. in Figure 3a Here, after the laser is coupled out by the optical fiber 31, a single piece of optical glass 32 can be used to achieve the purpose of laser collimation, collimating the laser into an almost parallel laser beam. Figure 3b In the beam expansion system of, after the laser is coupled out by the optical fiber 31, the single piece of optical glass 32 is moved to the optical fiber 31 to expand the laser beam to a certain divergence angle.
[0020] Figure 4a , Figure 4b It is a simplified schematic diagram of a device for collimating or beam expanding a common solid laser through optical glass in this embodiment. in Figure 4a Among them, the collimating system is an inverted Galileo telescope composed of a negative lens 41 and a positive lens 42, and the laser beam can become almost parallel laser beam after passing through the collimating system. Figure 4b In the beam expansion system of, move the positive lens 42 to the negative lens 41 to expand the laser beam to a certain divergence angle.
[0021] For different laser light sources, in figure 1 The collimation system 11 can be used Figure 3a Or the collimation system shown in 4a; the beam expanding system 13 can be used Figure 3b Or the beam expansion system shown in 4b.
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