# US 10,310,278 B2 · Semiconductor laser

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- Number: US 10,310,278 B2
- Document ID: US10310278B2
- Status: Granted
- Kind: B2
- Application number: 15/127,211
- Filed: 2016-02-06
- Published: 2018-02-01
- Granted: 2019-06-04
- Earliest claimed: 2016-01-11
- Assignees: BWT Beijing Ltd.
- Applicants: BWT Beijing Ltd.
- Inventors: Xiaochen Jiang; Tie Wang; Weirong Guo; Baohua Wang; Rui Liu; Lei Xu
- Web page: https://patentgrep.com/patent/US10310278B2

## CPC

- G02B 27/10: Beam splitting or combining systems (polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; {beam shaping, e.g. changing the cross-sectional area, by dividing or superposing multiple light beams G02B27/0905})
- G02B 6/4206: {Optical features (G02B6/4207, G02B6/421 take precedence)}
- G02B 6/4214: {the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device (G02B6/4246 takes precedence)}
- G02B 19/0019: {having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)}
- G02B 19/0057: {in the form of a laser diode array, e.g. laser diode bar (semiconductor laser arrays with beam combining arrangement H01S5/4012)}
- G02B 27/0905: {Dividing and/or superposing multiple light beams}
- G02B 27/0911: {Anamorphotic systems}
- G02B 27/0922: {the semiconductor light source comprising an array of light emitters}
- H01S 5/0071: {for beam steering, e.g. using a mirror outside the cavity to change the beam direction}
- H01S 5/40: Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30 (H01S5/50 takes precedence)
- H01S 5/4012: {Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms}
- H01S 5/4025: {Array arrangements, e.g. constituted by discrete laser diodes or laser bar (H01S5/42 takes precedence)}
- H01S 5/405: {Two-dimensional arrays}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

## Abstract

The present invention belongs to the field of laser technology, particularly relates to a semiconductor laser, including a substrate, and lasers, fast axis collimation components, slow axis collimation components, steering compression optical systems, a polarization beam combination prism, a focusing lens and an optical fiber provided on the substrate, wherein the lasers can be arranged in two rows or one row. And lasers of the same row are all located in a same plane. Each laser is sequentially provided with a fast axis collimation component and a slow axis collimation component in the direction of an optical path. The lasers of the same row correspond to a group of steering compression optical systems used to steer and compress the light beams collimated by the fast axis collimation components and the slow axis collimation components. The polarization beam combination prism is used for combining two beams of lasers having been steered and compressed by two groups of the steering compression optical systems. And the laser combined by the polarization beam combination prism is coupled into the optical fiber by the focusing lens. The present invention has a compact structure and a simple optical path, effectively reduces the thickness of the substrate and improves the thermal dissipation capacity of the laser, so that the efficiency and reliability of the laser are improved.

## Claims

### Claim 1

A semiconductor laser, comprising
a substrate, and lasers,
fast axis collimation components,
slow axis collimation components,
steering compression optical systems, a polarization beam combination prism,
a focusing lens and an optical fiber provided on the substrate,
wherein the lasers are arranged in two rows or one row, and the lasers of the same row are all located in a same plane, each laser is sequentially provided with a fast axis collimation component and a slow axis collimation component in the direction of an optical path, the lasers of the same row corresponds to a group of steering compression optical systems, the steering compression optical systems are used to steer and compress the light beams collimated by the fast axis collimation components and the slow axis collimation components, when the polarization beam combination prism is used for the two rows of lasers, two beams of lasers having been steered and compressed by two groups of the steering compression optical systems are combined, the focusing lens and the optical fiber are sequentially arranged behind the polarization beam combination prism, and the lasers are coupled into the optical fiber by the focusing lens;
wherein the steering compression optical systems adopt a transmission method or a reflection method;
when the steering compression optical systems adopt the transmission method, the steering compression optical systems include a transmission wedge prism and a plurality of steering mirrors, the plurality of steering mirrors corresponding to the respective lasers of the same row respectively, the beams emitted by the respective lasers sequentially passing through the fast axis collimation components, the slow axis collimation components and the steering mirrors, and the beams steered by the plurality of steering mirrors being all compressed by the transmission wedge prism.

### Claim 2

A semiconductor laser, comprising
a substrate, and lasers,
fast axis collimation components,
slow axis collimation components,
steering compression optical systems, a polarization beam combination prism,
a focusing lens and an optical fiber provided on the substrate,
wherein the lasers are arranged in two rows or one row, and the lasers of the same row are all located in a same plane, each laser is sequentially provided with a fast axis collimation component and a slow axis collimation component in the direction of an optical path, the lasers of the same row corresponds to a group of steering compression optical systems, the steering compression optical systems are used to steer and compress the light beams collimated by the fast axis collimation components and the slow axis collimation components, when the polarization beam combination prism is used for the two rows of lasers, two beams of lasers having been steered and compressed by two groups of the steering compression optical systems are combined, the focusing lens and the optical fiber are sequentially arranged behind the polarization beam combination prism, and the lasers are coupled into the optical fiber by the focusing lens;
wherein the steering compression optical systems adopt a transmission method or a reflection method;
when the steering compression optical systems adopt the reflection method, the steering compression systems include an optical element with a reflecting surface having a tilt angle and a plurality of steering mirrors, the plurality of steering mirrors corresponding to the respective lasers of the same row respectively, the beams emitted by the respective lasers sequentially passing through the fast axis collimation components, the slow axis collimation components and the steering mirrors, and the beams steered by the plurality of steering mirrors being all compressed by the optical element.

### Claim 3 (depends on 1)

The semiconductor laser according to claim 1, wherein the steering mirrors corresponding to the respective lasers of the same row are all located in the same plane.

### Claim 4 (depends on 3)

The semiconductor laser according to claim 3, wherein the tilt angles, relative to the substrate, of the respective steering mirrors located on the same plane are the same.

### Claim 5 (depends on 4)

The semiconductor laser according to claim 4, wherein the tilt angles of the respective steering mirrors located on the same plane are between 1° to 10°.

### Claim 6 (depends on 3)

The semiconductor laser according to claim 3, wherein the plane on which the lasers of the same row are located is higher than the plane on which the steering mirrors corresponding thereto are located.

### Claim 7 (depends on 1)

The semiconductor laser according to claim 1, wherein when two rows of lasers are arranged on the substrate, the two beams of lasers having been steered and compressed by the two groups of the steering compression optical systems, when arriving at the polarization beam combination prism, are located at the same height.

### Claim 8 (depends on 7)

The semiconductor laser according to claim 7, wherein the two rows of lasers can be located in the same plane or the two rows of lasers can be located in two planes having different heights, respectively.

### Claim 9 (depends on 2)

The semiconductor laser according to claim 2, wherein the steering mirrors corresponding to the respective lasers of the same row are all located in the same plane.

### Claim 10 (depends on 2)

The semiconductor laser according to claim 2, wherein when two rows of lasers are arranged on the substrate, the two beams of lasers having been steered and compressed by the two groups of the steering compression optical systems, when arriving at the polarization beam combination prism, are located at the same height.