JPH04121763U - Optical axis adjustment device for semiconductor laser module - Google Patents

Abstract

(57) [Summary] [Structure] The LD section 1 is held by a support 3, and the lens holder section 2 is held by a fine movement table 4. Microscope 5
The image inside the lens holder section 2 is enlarged, the enlarged image is taken by an infrared camera 6 at the rear, and this image is converted into an electrical signal. The electrical signal is sent to monitor TV7 and visualized. Adjust the optical axis while watching the image on the monitor TV, and fix the LD section 1 and lens holder section 2 using YAG.
By laser welding of laser head 8. [Effect] The work of adjusting the optical axis becomes easier and accuracy is improved.
Furthermore, YAG laser welding has the effect of improving overall reliability, such as improving long-term stability.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to an optical axis adjustment device, especially for semiconductor lasers for single mode fibers. Concerning improving the accuracy of the optical axis adjustment device of the module.

0002

[Conventional technology]

Semiconductor laser modules generally use laser diodes (hereinafter referred to as LDs). The laser beam emitted from this LD is focused by an optical lens and connected to an optical fiber. It is something that connects. The LD, optical lens, and optical fiber of this semiconductor laser module The optical axis connecting the fiber and the fiber must be on a straight line. If this optical axis shifts, the optical fiber The optical power output to the bar decreases, which becomes a fatal problem. This optical axis adjustment is performed using the LD During the module assembly process, the LD section containing the LD and the LD section containing the optical lens are separated. This is done in the process of fixing the lenses to each other, and an optical axis adjustment device is used at this time. light Since the outer diameter of the optical fiber is approximately 125 μm, axis adjustment is performed with precision in microns. degree will be required.

0003 Conventionally, this type of optical axis adjusting device has been used having the configuration shown in FIG. Figure 2 is FIG. 2 is an external view showing the configuration of a conventional example. The LD part 1 is held by the support 3 and The holder part 2 is equipped with a pressure sensor 10 and can be moved precisely in the X, Y, and Z directions. It is held by a fine movement table 4. The connector on the top of lens holder section 2 has an optical fiber. An optical fiber 12 is connected to the optical fiber, and an optical power meter 13 is connected to the tip of the optical fiber. Ru.

0004 When adjusting the optical axis, watch the instructions on the optical power meter 13 and make sure that the indicated value is at its maximum. The lens portion 2 held on the fine movement table 4 is moved in the horizontal direction for adjustment. Adjustment is complete. Once completed, carefully adjust the position of the LD section 1 and lens holder section 2 so that they do not move. Move the moving table 4 vertically toward the LD section and look at the display meter 11 that displays the pressure at this time. while applying the specified pressure.

[0005] In this state, solder the LD section 1 and lens holder section 2 using the soldering device 14. stick.

[0006]

[Problem that the idea aims to solve]

In the conventional example explained above, the maximum value of the indicated value is searched for while looking at the optical power meter 13. Therefore, the work required skill and there were many variations in the adjustment results. Also, fixing method Since it is soldered, there is a problem of lack of long-term reliability.

[0007]

[Means to solve the problem]

The optical axis adjustment device for a semiconductor laser module of the present invention has a clamp that holds the LD section. a fine movement table that holds a lens holder section located above the LD section; A measuring section that measures the light emitted from the lens holder section, and the LD section and the lens holder section. Optical axis adjustment device for semiconductor laser module consisting of fixing means for fixing. There, The measuring section includes a microscope that magnifies an internal image of the lens holder section, and a microscope that magnifies an internal image of the lens holder section. an infrared camera that receives an enlarged image and converts it into an electrical signal; It consists of a monitor TV that receives electrical signals and converts them into images.

[0008] Alternatively, a YAG laser welding machine is used for the fixing means.

[0009]

【Example】

Next, embodiments of the present invention will be described with reference to the drawings. Figure 1 shows the configuration of this embodiment. FIG. As in the conventional example, the LD section 1 is held by the support 3, and the lens The lens holder portion 2 is held by a fine movement table 4. At the top of the lens holder part 2, A microscope 5 is provided to magnify the inside of the lens holder section 2 and display the magnified image at the rear. Taken with infrared camera 6. The infrared camera 6 converts the image into an electrical signal. . In addition, the infrared camera 6 uses laser light from an LD, which is difficult to be sensitive to with a general camera. It is used because it is sensitive to light. The electrical signal from the infrared camera 6 is sent to the monitor T. It is sent to V7 and visualized.

0010 Next, the adjustment method will be explained. First, align the microscope 5 with the lens end surface of the lens holder section 2. Then, move the image a of this lens end surface projected on the monitor TV7 slightly to the center of the screen. It is moved by table 4.

[0011] Next, the LD of the LD section 1 is made to emit light, and the emitted light beam is displayed on the monitor TV7. Image b is moved to the center of the screen by the clamp 3.

0012 In this state, the optical axes are aligned, so move the fine movement table 4 in the vertical direction and connect the LD section 1 and the laser. Adjust the lens holder while watching the pressure gauge 11 so that the positional relationship with the lens holder part 2 does not shift. Pressure is applied to the LD part 2 in the direction of the LD part.

[0013] Next, attach a part of the YAG laser welding machine to the joint between the lens holder part 2 and the LD part. A YAG laser beam is emitted from a YAG laser head 8 to perform welding.

[0014]

[Effect of the idea]

As explained above, the optical axis adjustment device for semiconductor laser modules of the present invention The optical axis is adjusted visually on the monitor TV screen, making the work easier and more accurate. improves. In addition, YAG laser welding improves long-term stability and provides overall reliability. This has the effect of improving reliability.

[Brief explanation of drawings]

FIG. 1 is an external view showing the configuration of this embodiment.

FIG. 2 is an external view showing the configuration of a conventional example.

[Explanation of symbols]

1 LD section 2 Lens holder part 3 Clamp 4 Fine movement table 5 Microscope 6 Infrared camera 7 Monitor TV 8 YAG laser head 12 Fiber 13 Optical power meter 14 Soldering device

Claims (2)

[Scope of utility model registration request] 1. A clamp that holds a laser diode section, a fine movement table that holds a lens holder located above the laser diode section, a measurement section that measures light emitted from the lens holder section, and a laser diode section. and a fixing means for fixing the lens holder.
In the optical axis adjustment device for the module, the measurement unit includes a microscope that magnifies the internal image of the lens holder, an infrared camera that receives the magnified image of the microscope and converts it into an electrical signal, and an infrared camera that receives the magnified image of the microscope and converts it into an electrical signal. An optical axis adjustment device for a semiconductor laser module characterized by comprising a monitor (TV) that receives electrical signals and visualizes them. 2. The optical axis adjustment device for a semiconductor laser module according to claim 1, wherein a YAG laser welding machine is used as the fixing means.