阅读说明：本技术 一种二极管泵浦固体激光器 (Diode pumping solid laser ) 是由 华玉苍 于 2019-10-15 设计创作，主要内容包括：本发明属于固体激光器领域,具体涉及一种二极管泵浦固体激光器,包括第一激光谐振腔腔镜,及沿激光束方向依次设置的激光工作物质、声光Q开关和第二激光谐振腔腔镜,与现有技术相比,本发明产生的激光光斑具有改善的圆度,在激光作各种加工或其它应用时,若光束需在多个任意方向上扫描,可确保效果的一致性。(The invention belongs to the field of solid lasers, and particularly relates to a diode-pumped solid laser which comprises a first laser resonant cavity mirror, and a laser working substance, an acousto-optic Q switch and a second laser resonant cavity mirror which are sequentially arranged along the direction of a laser beam.)

1. The utility model provides a diode pumping solid laser, includes first laser cavity mirror, and along laser beam direction set gradually laser working substance, reputation Q switch and second laser cavity mirror, its characterized in that: a first nonlinear crystal component and a second nonlinear crystal component are arranged between the acousto-optic Q switch and the second laser resonant cavity mirror, the first nonlinear crystal component comprises a first nonlinear crystal and a first temperature control component, the second nonlinear crystal component comprises a second nonlinear crystal and a second temperature control component, and a polarizing film is arranged between the first nonlinear crystal component and the second nonlinear crystal component.

2. A diode pumped solid state laser as claimed in claim 1, wherein: the first nonlinear crystal and the second nonlinear crystal have mutually orthogonal crystal orientations.

3. A diode pumped solid state laser as claimed in claim 1, wherein: the first nonlinear crystal and the second nonlinear crystal are LBO, BBO or CLBO.

4. A diode pumped solid state laser as claimed in claim 1, wherein: the polarizer is an 1/2 wave plate for a 1064nm fundamental wave.

5. A diode pumped solid state laser as claimed in claim 1, wherein: the polarizer is an 1/2 wave plate for 1064nm fundamental waves and is a 1/2 wave plate for 532nm double frequency wavelength.

Technical Field

The invention belongs to the field of solid lasers, and particularly relates to a diode-pumped solid laser.

Background

Fig. 2 is a side-pumped schematic of a conventional diode-pumped solid state laser. Wherein 011 is a laser working substance such as Nd: YAG rod or Nd: YVO4 rod; 027 is a pump laser diode, driven by pump current 028.

The pump light of the laser diode can also pump the laser rod from the end face of the laser rod through fiber coupling, i.e., an end pump, which is not shown in the figure.

In FIG. 2, 010 and 021 are cavity mirrors of the laser resonator, where 010 is the total reflection (1064nm) generated at the fundamental frequency of the laser, such as Nd: YAG. The cavity mirror 021 is totally reflecting at the fundamental frequency of the laser, but almost totally transmitting at the frequency doubling of the fundamental frequency, such as 532nm for Nd: YAG. 013 is acousto-optic Q switch, 012 is radio frequency signal for driving acousto-optic Q switch 013, 014 is frequency doubling nonlinear crystal, e.g. LBO,026 is temperature control component of nonlinear crystal. 025 is the drive current of the temperature control means. 022 is a polarizing plate.

The operating principle of such lasers is well known and need not be described in detail. The 013 acousto-optic Q switch controls the laser to work (enter) a pulse working state, corresponding laser oscillation is carried out, 029 is linearly polarized due to the existence of the polaroid 022, a part of fundamental wave (frequency) laser wave is frequency-doubled to 532nm frequency-doubled light through the frequency doubling crystal 014, and the light is output out of the cavity through the output cavity mirror 021 which is highly transparent to 532 nm. The output laser beam is 020 times of frequency light.

Such frequency doubled lasers are simple and efficient, but have a significant disadvantage that since the spatial acceptance angles of the frequency doubling crystals, such as LBO, in the two orthogonal directions X and Y are very different, the output frequency doubled light is asymmetric in the two directions X and Y, and as shown in fig. 3 (a), the light spot is elliptical, which shows that the light spot is significantly larger in the Y-axis direction than the light spot in the X-axis direction, and the frequency doubling spatial acceptance angle corresponding to the frequency doubling crystal in the Y-axis direction is significantly larger than the frequency doubling acceptance angle in the X-axis direction, the light spot roundness of the resulting laser is poor, so that the uniformity of the effect cannot be ensured if the light beam needs to be scanned in multiple arbitrary directions during application.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a diode-pumped solid-state laser, and laser generated by the laser has better light spots and can ensure the consistency of the effect.

The difference between the green laser of the present invention and the conventional green laser is in the frequency doubling crystal part. Different from the design of a single frequency doubling crystal (014 in figure 2), the invention adopts two shorter frequency doubling crystals, the crystal orientations of the two shorter frequency doubling crystals are mutually orthogonal, and the roundness of the laser spot after output is obviously improved.

The diode pumping solid laser comprises a first laser resonant cavity mirror, a laser working substance, an acousto-optic Q switch and a second laser resonant cavity mirror, wherein the laser working substance, the acousto-optic Q switch and the second laser resonant cavity mirror are sequentially arranged along the direction of a laser beam, a first nonlinear crystal component and a second nonlinear crystal component are arranged between the acousto-optic Q switch and the second laser resonant cavity mirror, the first nonlinear crystal component comprises a first nonlinear crystal and a first temperature control component, the second nonlinear crystal component comprises a second nonlinear crystal and a second temperature control component, and a polarizing film is arranged between the first nonlinear crystal component and the second nonlinear crystal component.

Further, the first nonlinear crystal and the second nonlinear crystal have mutually orthogonal crystal orientations with respect to each other.

When nonlinear conversion is performed by using nonlinear crystals with larger difference of the acceptance angle of the nonlinear conversion space in two orthogonal directions, two nonlinear crystals of the same type are adopted and are mutually orthogonally connected in series, a specific polarizing film is arranged between the two nonlinear crystals, the polarization direction of an input laser beam is rotated by 90 degrees, the beam diameters of nonlinear conversion light beams generated by the two nonlinear crystals in the two orthogonal directions are different, light spots of the light beams are in a certain ellipse, the long axis directions of elliptic light spots of the light beams generated by the two orthogonal nonlinear crystals after nonlinear conversion are mutually orthogonal, and the laser light spots generated by the nonlinear conversion after overlapping have improved roundness.

Further, the first nonlinear crystal and the second nonlinear crystal are LBO, BBO, or CLBO.

Further, the polarizing plate is an 1/2 wave plate for a 1064nm fundamental wave, and the output laser light is an doubled light in which two polarization directions are orthogonal to each other.

Further, the polaroid is an 1/2 wave plate for 1064nm fundamental waves and is a 1/2 wave plate for 532nm frequency doubling wavelength, and the output frequency doubled 532nm laser is linear polarization frequency doubled light.

Further, the laser working substance is Nd: YAG, Nd: YVO, Yb: YVO or YLF.

Compared with the prior art, the laser spot generated by the invention has improved roundness, and when the laser is used for various machining or other applications, if the light beam needs to be scanned in a plurality of arbitrary directions, the consistency of the effect can be ensured.

Drawings

FIG. 1: the diode pump is positioned on the side of the structural schematic diagram;

FIG. 2: the structure schematic diagram of the existing diode-pumped solid-state laser;

FIG. 3: the light spots generated by the invention are compared with the light spots generated by the prior art.

Detailed Description