Pumping source structure utilizing invisible return light

Abstract

The utility model discloses a pumping source structure utilizing invisible return light, which belongs to the technical field of lasers and comprises a dichroic mirror arranged on a pumping light output path, the dichroic mirror is arranged at 45 degrees, a frequency doubling crystal is arranged on a reflection path of the return light outputting the pumping light through the dichroic mirror, and the frequency doubling crystal is arranged on the dichroic mirror. Returning light is transmitted into visible light through the frequency doubling crystal, a pipe nozzle is arranged on a visible light path of the pumping source shell, the pipe nozzle is connected with an output optical fiber, and the visible light is coupled into the pumping light optical fiber through the collimator. According to the pumping source utilizing the return light, the return light is converted into visible light through the frequency doubling crystal, and the visible light is coupled into the optical fiber to be utilized by a system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of laser, specifically relates to a pump source structure of utilizing invisible back light. BACKGROUND

[0002] The back light is laser with the same wave length as the laser output light and opposite direction, and the back light is filtered by a reflecting mirror as laser for reducing system reliability. The laser output is usually invisible wave band, and different color visible light (usually red light or green light) is added in the laser as indicating light, and the indicating light and the output laser are coaxially outputted as laser indicating.

[0003] The high-power fiber laser mainly comprises a pump source, a resonant cavity and a gain medium, and when high-power laser is outputted, the back light will be coupled into the semiconductor pump source due to the reversibility of the fiber optical path, and the conventional treatment is to place a reflecting mirror at the coupling position of the pump source, so that the returned laser is shot to the sidewall of the pump source shell. When high-power laser is outputted, the back light incident into the pump source can reach several watts to tens of watts, and the high-power back light directly irradiated to the shell can reduce the reliability of the pump source. UTILIZYING INVISIBLE BACK LIGHT

[0004] The utility model discloses a pump source structure of utilizing invisible back light, and the back light is converted into visible light through a frequency doubling crystal, and the visible light is coupled into the optical fiber and utilized by the system.

[0005] The utility model discloses the technical scheme as follows to realize the purpose.

[0006] A pump source structure of utilizing invisible back light, comprising a dichroic mirror arranged on a pump light output path, wherein the dichroic mirror is placed at an angle of 45 degrees, used for increasing the transmission of pump light and reflecting invisible back light, and a frequency doubling crystal is arranged on the path of the back light reflected by the dichroic mirror, the back light is outputted as visible light through the frequency doubling crystal, a nozzle is arranged on the visible light path of the pump source shell, and an output optical fiber is connected to the nozzle.

[0007] Further, the visible light is coupled into the pump light optical fiber through a collimator.

[0008] Further, the wavelength of the back light is 1064nm.

[0009] Further, the material of the frequency doubling crystal is KTP.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] The prior art back light cannot be utilized, and instead reduces the reliability of the semiconductor pumping source, and a frequency doubling crystal is used to convert the back light into visible light which is coupled out through an optical fiber, and can be used as visible light output by the laser. Taking a laser with an output wavelength of 1064nm as an example, the 1064nm back light is converted into 532nm green light through a KTP crystal, and the green light is coupled into an optical fiber through a collimator with a tail fiber and is output. The 1064nm laser which is invisible to the human eye is converted into 532nm green light which is visible to the human eye through a KTP frequency doubling crystal, a hole is opened in the pumping source shell, the back light is coupled into the optical fiber, and can be used as indicating light which is output from the output head. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0013] Figure 1 The structure of the present application is shown in the figure;

[0014] In the figure, the reference signs are: 1-pumping source shell, 2-bicolor mirror, 3-frequency doubling crystal, 4-nozzle, 5-output optical fiber. DETAILED DESCRIPTION

[0015] The exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be completely conveyed to those skilled in the art. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0016] The present application discloses a pumping source structure using invisible back light, as shown in Figure 1 When the laser works, the back light will return to the pumping source in the opposite direction of the pumping light exit path, a 45° bicolor mirror 2 is arranged on the pumping light output path of the pumping source, the pumping light is transmitted, and the invisible back light is reflected, a frequency doubling crystal 3 is arranged on the reflection path of the back light through the bicolor mirror 2, the frequency doubling crystal 3 frequency doubles the invisible back light into visible light, a nozzle 4 is arranged on the visible light path of the pumping source shell 1, the visible light is output to the output optical fiber 5 connected to the nozzle 4, and finally the visible light is coupled into the pumping light optical fiber through the collimator.

[0017] With 1064nm high-power pulsed fiber laser as an example, the laser output wavelength is invisible light, and a semiconductor-coupled indicating light is usually added for laser direction indication, and the indicating light intensity is a fixed value and cannot represent the output laser intensity. The pump source structure provided by the utility model converts 1064nm return light frequency doubling into 532nm green light as indicating light output, and judges the light power intensity through the indicating light intensity, so that the system circuit control is simpler.

[0018] The utility model is described in detail through the above examples, but the content described can only be considered as exemplary embodiments of the utility model and cannot be considered as limiting the implementation scope of the utility model. The protection scope of the utility model is defined by the claims. Any technical solution utilizing the technical solution described in the utility model or inspired by the technical solution of the utility model within the essence and protection scope of the utility model, any equal changes and improvements to the application scope, etc. should still belong to the patent coverage protection scope of the utility model. It should be noted that, in order to clearly express, the description of the utility model omits the expression of some components and processing known by the person skilled in the art which is not directly and obviously related to the protection scope of the utility model.

Claims

1. A pump source structure utilizing invisible back-return light, characterized by, The application relates to a pump source, which comprises a double dichroic mirror arranged on a pump light output path, the double dichroic mirror is arranged at an angle of 45 degrees, used for transmitting the pump light and reflecting the invisible return light, a frequency doubling crystal is arranged on the path of the return light reflected by the double dichroic mirror, the return light outputs visible light through the frequency doubling crystal, a nozzle is arranged on the path of the visible light, and the nozzle is connected with an output optical fiber.

2. A pump source configuration utilizing non-visible return light according to claim 1, wherein, The visible light is coupled into a pump light optical fiber through a collimator.

3. A pump source structure utilizing non-visible return light according to claim 1 or 2, characterized in that, The wavelength of the return light is 1064nm.

4. A pump source structure utilizing non-visible return light according to claim 3, wherein The frequency doubling crystal material is KTP.

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