JPS58159514A - Formation of laser beam space distribution - Google Patents

Abstract

PURPOSE:To obtain the space distribution of a laser beam suitable for various kinds of work, by guiding >=2 kinds of laser light having different properties to an optica lfiber at different angles of incidence and distributing projected light coaxially. CONSTITUTION:Laser beams 2 and 4 which are emitted from laser oscillators 1 and 3 and have different properties are deflected by reflecting mirrors 5 and 6 perpendicularly to travel in parallel and then condensed by a condenser 7 to the incidence terminal 11 of a composite optical fiber 10. At this time, the condensed light 9 of laser light 4 has a large-incidence-angle component removed by a light shielding plate 12 having a semicircular opening and is made incident to the incidence terminal 11 together with the condensed light 8 of laser light 2. The projected light consists of a large-diameter circular beam 13 originating from the laser beam 2 and a small-diameter circular beam 14 which overlaps with the former beam coaxially and originates from the laser beam 4, 1 thus obtaining the space distribution of the laser beam suitable for various kinds of work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Substances of the Invention] The present invention relates to a method for forming a concentric spatial distribution by combining laser beams with different properties.

[Technical Background of the Invention and Problems Therewith] Pulsed lasers are used for metal processing such as welding, cutting, and drilling using lasers, which can melt and evaporate metals. During the welding process, a phenomenon in which cracks radiate can be seen in the welded parts. Further, since it is difficult to obtain the above-mentioned 1g degree of commercial energy with a continuous emitting laser, it is mainly applied to heat treatment processes such as hardening.

The processing performance of the radar beam 1 for processing these three metals changes depending on the strong variation in its space, but its control technology is complex. By the way, the spatial distribution characteristics of the 1/- laser beam are determined by the type and performance of the laser oscillator. The intensity of the beam is adjusted by changing the distribution of the beam emitted from the oscillator by using a large number of condensing lenses and a condensing reflector, but this requires a complicated optical system and is not practical. There are some problems.

When applying laser beams to thermal processing, it is conceivable that welding, cutting, heat treatment, etc. can be performed efficiently by coaxially combining various laser beams with different characteristics and irradiating them, but this is not easy to achieve. I couldn't do it.

[Purpose of the invention]

The present invention provides a method for spatially distributing laser beams by combining lasers with different properties such as continuous lasers, pulsed lasers, and lasers with different wavelengths and creating a desired distribution suitable for various types of processing.

[Summary of the invention]

Two or more types of V-de lights with different properties are guided into an optical fiber with different incident angles, and the laser lights are coaxially distributed.

[Example of longevity of invention]

FIG. 1 shows a first embodiment of the present invention, in which (1) shows a first laser beam 1G5 that emits a continuous laser beam (2). +3)
is a second laser oscillator that emits a puffless laser beam (4). The two laser beams mentioned above are deflected at right angles by reflections 5) and (6), respectively, so that the ends of the beams of both beams touch the beam and travel in parallel.

(The force is a condensing lens, the center of which is located at a position that coincides with the boundary of the two radar beams!2) pf4),
Two focused beams 8) = (9) and combine the optical fiber [1G's input end (1υ is oriented at an angle of 1. Here, the incident angle of the focused beam 19 of the pulsed laser beam (4)) Before entering the incident end (1υ), a large component is removed by a light shielding plate t12 having a semicircular opening, and the remaining partially focused light 9) is converted into continuous laser light 12) m ffi +8)
The light is also incident on the incident end 0υ.

Focused light 8 introduced into the optical fiber/IG as described above
)・9) Tsuba Optical Fiber +1 Output (When emitted from 1υ, as shown in Figure 2 (a) and (b), when the pulsed laser beam (4) is shiny, the output power is continuous and small. A small diameter circular beam (1) is formed by a large diameter circular beam (] 31 and this circular beam +13) formed by the Rede beam 12) and a small diameter circular beam (1) formed by the center l (coaxially superimposed pulsed Rede beam +4 with a large output power). When welding is applied to a laser output where the central 461-pulse laser beam and the pulsed laser beam are superimposed and have a property of high energy density and high intensity, and the peripheral part has the property of a continuous laser beam, it is possible to constantly Figure 3 shows the second Inume row of this invention, which can irradiate the center of the tiny head region that is constantly preheated with a continuous laser beam in a pulsed manner. By considering the angle (al) relative to the axis of the optical fiber 111 and the axis of the optical fiber 111, for example, if the Kitaki Higashifuku light (8) is made to enter the input end 0υ with a smaller angle of incidence than the focused light 9), the output will be From end a2, the first
As shown in Figures (a) and (b), the continuous laser beam (
A circular beam (1) with components of 2) and an annular beam (1) with a component of a pulsed laser (4) coaxially surrounding this beam
) is formed in a multi-turn distribution. A laser with such a pattern is suitable for soldering processing.

FIG. 5 shows a third embodiment in which the angle (θ) in the second embodiment is tilted in the opposite direction, and the Coutane distribution is a pattern distribution opposite to that of the second embodiment, that is, As shown in Fig. 6(alt(b)), a circular beam ('I'rI) having a component of a pulsed laser (4) and an annular beam ('I'rI) having a component of a continuous laser beam (2) coaxially surrounding this beam (
The distribution consists of Akebono.

FIG. 7 shows a fourth embodiment of the present invention, in which one of the cursor laser beams (4) is focused by a condenser lens (21), and its optical axis is aligned with the axis of the α value of the composite optical fiber. death,
The other continuous laser beam (2) is introduced at one end into another optical fiber 04 using a condensing lens ρ, and its output beam (
Synthetic fiber (
24 at a larger incident angle than the lJe pulse laser beam (4). With this method, a pattern in which two types of laser beams are coaxially distributed as in the second or third embodiment, that is, a circular beam 1 with a pulsed laser beam (4) component in the center is created. A pattern consisting of an annular beam (2) having a component of a continuous radar beam (2) around the annular beam 19 is emitted from the composite optical fiber +11.

Note that in the present invention, the two types of beams are a pulsed laser beam and a continuous laser beam, but the invention is not limited to this, and the pulsed I@
f lasers with different oscillation wavelengths, or continuous lasers with seven powers different from each other, or v lasers with different oscillation wavelengths.
It is clear that it can also be applied to It can be used for purposes other than welding, cutting, heat treatment, and other processing purposes, as well as for medical purposes.In addition to using two types of lasers for processing energy, at least one of them is used for visible laser light to promote chemical reactions. It can be used for aiming the irradiation of the other laser beam.

〔Effect of the invention〕

The center part is the pulsed laser beam component and the peripheral part is the continuous laser beam component 1 (distribution or vice versa).A distribution suitable for laser cutting, welding, drilling, heat treatment, soldering, etc. is now easily obtained.

[Brief explanation of the drawing]

Fig. 1 1 @ 3 :q j Figs. 5 and 7 are schematic diagrams for explaining the first to fourth embodiments of the present invention, and Fig. 2 (a)? (b), Figure 4 (a) - (b)
) and 6th II (a) and rb) are respectively 17th
FIG. 77 is a pattern distribution diagram of a laser beam obtained in the third example. (1)...Continuous laser oscillator, (2)...Pulse laser oscillator,! +n...Double optical lens, IQ...Synthetic optical fiber. Figure 1/! Plan 2 Plan 4 Haze

Claims (1)

[Claims] A distribution in which at least two laser oscillators emit laser beams with different properties, these laser beams are input into an optical fiber at different incident angles, and circular beams with different diameters are concentrically superimposed from the output end of the optical fiber. Alternatively, a laser beam spatial distribution forming method is characterized in that an annular beam is output in a distribution concentrically touching the periphery of a circular beam.