# US 10,310,280 B2 · Offset laser array with beam combining optical element

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- Number: US 10,310,280 B2
- Document ID: US10310280B2
- Status: Granted
- Kind: B2
- Application number: 15/710,519
- Filed: 2017-09-20
- Published: 2018-05-24
- Granted: 2019-06-04
- Earliest claimed: 2016-11-18
- Assignees: II-VI Suwtech, Inc.
- Applicants: II-VI Suwtech, Inc.
- Inventors: Yuan Shen; Dashan Li; Jintao Yang; Yaping Zhao; Xiaobin Sun
- Web page: https://patentgrep.com/patent/US10310280B2

## CPC

- G02B 27/14: operating by reflection only
- 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 27/10: 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 27/108: {for sampling a portion of a beam or combining a small beam in a larger one, e.g. wherein the area ratio or power ratio of the divided beams significantly differs from unity, without spectral selectivity}
- G02B 27/143: {using macroscopically faceted or segmented reflective surfaces}
- G02B 27/30: Collimators
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A laser array includes laser diodes arranged in a stepped form; a shaping optical system deposited at the emitting side of each one of the diodes in the laser array; and a beam combining optical element deposited at the emitting side of the shaping optical system, the beam combining optical element having reflecting surfaces arranged in a stepped form and corresponding to each of the laser diodes.

## Claims

### Claim 1

A laser beam device comprising:
a laser array comprising several laser diodes arranged in a stepped form, each laser diode having an emitting surface;
a shaping optical system, set at the emitting side of said laser array;
a beam combining optical element, set at the emitting side of said shaping optical system, wherein said beam combining optical element comprises several reflecting surfaces corresponding to each of the laser diodes of said laser array, and said reflecting surfaces are arranged in a stepped form;
wherein said several laser diodes include a first laser diode and a plurality of second laser diodes, said first laser diode positioned farther from the beam combining optical element than the second laser diodes;
wherein the emitting optical path length from the emitting surface of the first laser diode to said beam combining optical element is substantially equal to the optical path length for each second laser diode, consisting of the sum of the emitting optical path length from the emitting surface of each second laser diode to its corresponding reflecting surface in said beam combining optical element and the reflecting optical path length from said corresponding reflecting surface to the emitting optical path from the first laser diode to said beam combining optical element.

### Claim 2 (depends on 1)

The laser beam device of claim 1, wherein several laser diodes of said laser array are arranged along a first direction, the emitting light of each said laser diode is shot out along a second direction, wherein, the spacing along said second direction between several said reflecting surfaces are smaller than the spacing along said first direction between several said laser diodes.

### Claim 3 (depends on 1)

The laser beam device of claim 1, wherein the emitting optical path from the laser diode to its corresponding reflecting surface is orthogonal to the reflecting optical path reflected by said reflecting surface.

### Claim 4 (depends on 1)

The laser beam device of claim 1, wherein the angle between each said reflecting surface of said beam combining optical element and the emitting direction of the emitting light of said shaping optical system is 45°.

### Claim 5 (depends on 1)

The laser beam device of claim 1, wherein said beam combining optical element comprises several reflecting mirrors, each said reflecting mirror is set at the emitting surface of each said laser diodes.

### Claim 6 (depends on 1)

The laser beam device of claim 1, wherein said beam combining optical element is a reflecting mirror with several said reflecting surfaces, wherein, each said reflecting surface is set at the emitting surface of each said laser diode.

### Claim 7 (depends on 1)

The laser beam device of claim 1, wherein said shaping optical system comprises several fast axis collimating lenses in one-to-one correspondence with said laser diode devices, each said fast axis collimating lens is set at the emitting side of each said laser diode.