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High-power laser

A laser and high-power technology, applied in the laser field, can solve the problems of output power limitation, laser output power limitation, laser instability, etc., and achieve the effect of improving efficiency and power, and high conversion efficiency

Pending Publication Date: 2021-06-01
富通尼激光科技(东莞)有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] In end-pumped lasers, active ion-doped crystals such as Nd: YVO have been developed. 4 , Nd: YLF and Nd: YAG crystal end-pumped lasers, the crystal can be end-pumped from both ends, however, problems such as thermal lens, thermally induced birefringence and thermal distortion effects, and crystal fracture limit the output power of the laser, for example for Higher output power from Nd:YAG lasers, especially for linearly polarized TEM 00 mode, which usually requires an external amplifier, has been proposed to solve the thermal and stress problems caused by pumping, however, the output power is still limited, and the conventional wisdom is that high-brightness pumping can obtain the best conversion efficiency and better mode Quality, in order to obtain high efficiency, compactness and good mode quality, the optical cavity length is usually limited to 30cm or less, and the spot diameter is 0.6mm or less; in addition, the main Nd atomic percentage doping level is about 1%, Nd:YLF and Nd:YVO 4 Likewise, and a typical diode end-pumped Nd:YAG laser in a polarized TEM 00 Mode output power is 10W or below
[0003] Existing diode-pumped solid-state lasers are more efficient and compact than lamp-pumped lasers, especially in those requiring TEM 00 Mode laser beam applications such as Nd:YAG, Nd:YLF and Nd:YVO 4 Diode end-pumped laser crystals such as have produced the best mode quality and highest TEM 00 mode output power, but in traditional end-pumped designs, the method of removing heat from a diode-pumped laser crystal is "conduction" cooling (the laser crystal is mounted directly on a heat sink), since only a fraction of the pump power converted to laser radiation, while the remaining power is transferred to the crystal lattice as non-radiative transitions and absorption, resulting in non-uniform heating of the laser medium; in order to counteract the thermal effect of the pump radiation, the laser medium must be cooled during operation, likewise, the Mounting of the crystal to a heat sink causes additional mechanical stress on the crystal, which is sensitive to environmental and temperature changes, which in turn will lead to long-term instability of the laser in an industrial environment with consequent non-uniform temperature distribution The birefringence and thermal distortion caused by thermal stress severely limit the TEM 00 Maximum output power in mode, e.g. linearly polarized TEM of a diode end-pumped Nd:YAG laser 00 Mode output power is usually limited to around 10W, so higher output power, high reliability and stability of lasers are critical for their industrial applications

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Examples

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Effect test

example 1

[0086] figure 2 Specific configuration of lasers shown: two 30W fiber coupled diode lasers. Fiber-coupled diodes output through energy delivery fibers with a diameter of 0.8 mm and a numerical aperture NA of 0.2. The pump beam with a wavelength of 808nm is incident into the Nd:YAG laser crystal through the lens assembly. The pump beam waist diameter in the laser crystal is about 1 mm. like Figure 7 The laser medium 8 shown includes: central part - 0.5% Nd-doped Nd:YAG crystal of φ3 mm × 30 mm; both ends - undoped YAG crystal of φ3 mm × 5 mm, respectively bonded to the doped crystal by diffusion . The total crystal length is 40 mm. As shown in Figure 6, the YAG crystal was installed in the cooling jacket 7. Two O-rings and stainless steel plates hold the ends of the YAG crystal. The entire 30mm long Nd:YAG crystal is directly water cooled. Water flows in from one end and out the other. The total length of the optical resonant cavity 1 is about 50 cm. By designing th...

example 2

[0088] The size of the laser crystal used in Example 1 is changed to φ4mm×30mm, the doping concentration of 0.5% Nd remains unchanged, and the size of the undoped regions at both ends is φ4mm×5mm. All other descriptions are the same as Example 1. We achieved a 19.0W polarized TEM 00 mode output. Although the conversion efficiency is 31.6%, which is lower than Example 1, the laser output is stable and reliable, and the mode quality is excellent.

[0089] On the other hand, the laser of the present invention can realize harmonic beam output, such as Figure 3-5 As shown, the present invention is particularly suitable for generating high power harmonic beam lasers, image 3 Given the example of a second harmonic generator 22, ideally the laser medium 8 is Nd:YAG, Nd:YLF or Nd:YVO 4 Crystals, mirrors An optical resonant cavity 1 is formed between mirror one 4 and mirror two 6, both mirror one 4 and mirror two 6 are highly reflective to the fundamental frequency beam - for Nd:Y...

example 3

[0091] image 3 In the laser shown, the dichroic mirror 19 is oriented at an angle of approximately 56 degrees relative to the fundamental and second harmonic beams, and the face 12 of the dichroic mirror 19 is coated with a high reflection of approximately 99.5% for the S-polarized 532 nm wavelength film and a high transmittance film of about 99.8% for P-polarized 1064nm wavelength, and the surface 10 of the dichroic mirror 19 is not coated. The base material of the dichroic mirror 19 is fused silica with a thickness of about 1 mm. The acousto-optic Q-switch 18 was inserted into the cavity and placed at the Bragg angle, and the laser remained inactive while the continuous RF power was on. The effect of the dichroic mirror 19 is similar to that of the polarization discriminator 10, which forces the laser to work with the P-polarized fundamental frequency beam, and the reflectivity of the mirror two 6 at 1064nm and 532nm is about 99.9%, and SHG is to generate the second harmon...

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Abstract

The invention provides a high-power laser. The laser comprises an optical resonant cavity, a harmonic generation device, an optical axis, a first reflector, a folding reflector, a second reflector and a cooling jacket. The optical resonant cavity is arranged between the reflecting surface of the first reflector and the reflecting surface of the second reflector, the optical axis is arranged in the optical resonant cavity, and the harmonic generation device is arranged on the optical axis. The folding reflector is arranged between the first reflector and the second reflector and is close to the harmonic generation device; and the harmonic generation device is arranged in the cooling jacket. The invention belongs to the technical field of the laser, and particularly relates to the high-power laser which improves output power, long-term stability and pumping conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a high-power laser. Background technique [0002] In end-pumped lasers, active ion-doped crystals such as Nd: YVO have been developed. 4 , Nd: YLF and Nd: YAG crystal end-pumped lasers, the crystal can be end-pumped from both ends, however, problems such as thermal lens, thermally induced birefringence and thermal distortion effects, and crystal fracture limit the output power of the laser, for example for Higher output power from Nd:YAG lasers, especially for linearly polarized TEM 00 mode, which usually requires an external amplifier, has been proposed to solve the thermal and stress problems caused by pumping, however, the output power is still limited, and the conventional wisdom is that high-brightness pumping can obtain the best conversion efficiency and better mode Quality, in order to obtain high efficiency, compactness and good mode quality, the optical cavity length is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/081H01S3/0941H01S3/108H01S3/109H01S3/16
CPCH01S3/081H01S3/0941H01S3/108H01S3/109H01S3/163H01S3/1643
Inventor 尹雨松刘学松王世波陶锐周晓海黄巧杨焕鹏刘明明
Owner 富通尼激光科技(东莞)有限公司