JP7317049B2 - 半導体レーザ素子 - Google Patents
半導体レーザ素子 Download PDFInfo
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- JP7317049B2 JP7317049B2 JP2020562870A JP2020562870A JP7317049B2 JP 7317049 B2 JP7317049 B2 JP 7317049B2 JP 2020562870 A JP2020562870 A JP 2020562870A JP 2020562870 A JP2020562870 A JP 2020562870A JP 7317049 B2 JP7317049 B2 JP 7317049B2
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- 239000004065 semiconductor Substances 0.000 title claims description 380
- 239000000758 substrate Substances 0.000 claims description 53
- 238000005253 cladding Methods 0.000 claims description 50
- 229910000980 Aluminium gallium arsenide Inorganic materials 0.000 claims description 34
- 238000003475 lamination Methods 0.000 claims description 28
- 230000010355 oscillation Effects 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 description 69
- 229910052751 metal Inorganic materials 0.000 description 69
- 238000000926 separation method Methods 0.000 description 47
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 27
- 238000005520 cutting process Methods 0.000 description 19
- 238000005530 etching Methods 0.000 description 19
- 238000004519 manufacturing process Methods 0.000 description 13
- 239000007769 metal material Substances 0.000 description 12
- 230000004888 barrier function Effects 0.000 description 10
- 238000003776 cleavage reaction Methods 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 10
- 230000007017 scission Effects 0.000 description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- 238000007747 plating Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 5
- 230000010287 polarization Effects 0.000 description 5
- 230000006798 recombination Effects 0.000 description 4
- 238000005215 recombination Methods 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001771 vacuum deposition Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- H01S5/343—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/34346—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser characterised by the materials of the barrier layers
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Description
図1は、この発明の第1実施形態に係る半導体レーザ素子の外観を示す斜視図である。図2は、図1の半導体レーザ素子の正面図である。図3は、図1の半導体レーザ素子の平面図である。図4は、図1の半導体レーザ素子の底面図である。図5は、図3のV-V線に沿う図解的な断面図である。図6は、図3のV1-VI線に沿う図解的な断面図である。
[2]第2実施形態
図21は、この発明の第2実施形態に係る半導体レーザ素子の断面図であって、図6の切断面に対応する断面図である。図21において、前述の図6の各部に対応する部分には図6と同じ符号付して示す。
[3]第3実施形態
図22は、この発明の第3実施形態に係る半導体レーザ素子の断面図であって、図6の切断面に対応する断面図である。図22において、前述の図6の各部に対応する部分には図6と同じ符号付して示す。
[4]第4実施形態
半導体レーザ素子の電流-光出力特性は、温度依存性を有している。したがって、半導体レーザ素子の温度が変動すると、光出力が変動する。また、半導体レーザ素子の出力波長は、温度依存性を有している。したがって、半導体レーザ素子の温度が変動すると、出力光の波長が変動する。
[5]第5実施形態
図29は、本発明の第5実施形態に係る半導体レーザ素子の外観を示す図解的な斜視図である。図30は、図29の半導体レーザ素子の図解的な平面図である。図31は、図30のXXXI- XXXI線に沿う図解的な断面図である。図31において、前述の図6の各部に対応する部分には、図6と同じ符号を付して示す。
2 半導体積層構造(狭義)
3 n側電極
4,4A,4B p側電極
5 電流狭窄層
6 ウエハ
7 切断ライン
7a 端面切断ライン
7b 側面切断ライン
8 第1分離溝痕跡
9 第2分離溝痕跡
10 活性層
11 n側ガイド層
12 p側ガイド層
13 n型半導体層
14 p型半導体層
15 n型AlGaAsクラッド層
16 第1p型AlGaAsクラッド層
17 p型InGaPエッチングストップ層
18 第2p型AlGaAsクラッド層
19 p型InGaPエッチングストップ層
20 p型GaAsキャップ層
21 p型コンタクト層
30,30A,30B リッジ
30b 矩形リッジ
31,32 共振器端面
33,34 側面
35 端面窓構造
41 第1電極膜
42 第2電極膜
50 半導体積層構造(広義)
60 半導体レーザ素子
71 ZnO層
72 マスク層
80 第1分離溝
81 第1テーパ状側面
82 第2テーパ状側面
83 底面
90 第2分離溝
100 個別素子
110 バー状体
221 量子井戸層
222 障壁層
300,600 半導体レーザ素子
301 絶縁膜
302 ヒータ
303 第1ヒータ電極
303A 電極部
303B 接続部
304 第2ヒータ電極
304A 電極部
304B 接続部
401,421,431 第1金属膜
402,422,432 第2金属膜
403,423,433 第3金属膜
411 Ti膜
412 Pt膜
501 絶縁材料膜
512 第1金属材料膜
601 主半導体レーザ
602 熱源用半導体レーザ
603 領域分離溝
Claims (11)
- 基板と、前記基板の表面側に配置されたn型クラッド層と、前記n型クラッド層に対して前記基板とは反対側に配置された活性層と、前記活性層に対して前記n型クラッド層とは反対側に配置されたp型クラッド層とを有する半導体積層構造と、
前記半導体積層構造における前記基板側とは反対側の表面の一部に形成された半導体レーザ用p側電極と、
前記半導体積層構造の前記表面の一部に形成された絶縁膜と、
前記絶縁膜上に形成されたヒータと、
前記絶縁膜上に形成され、前記ヒータの一端に接続された第1ヒータ電極および前記ヒータの他端に接続された第2ヒータ電極とを含み、
前記第1ヒータ電極の主要部および前記第2ヒータ電極の主要部は、それぞれ、前記ヒータに対して、前記半導体レーザ用p側電極とは反対側に配置されており、
前記第1ヒータ電極の主要部、前記第2ヒータ電極の主要部および前記半導体レーザ用p側電極は、それぞれ、前記ヒータの厚さよりも厚い部分を有しており、
前記ヒータの厚さよりも厚い部分は、前記ヒータの厚さの5倍以上の厚さを有している、半導体レーザ素子。 - 前記活性層は、TMモード発振を生じさせるための引っ張り歪みを有する量子井戸層を含み、
前記n型クラッド層およびp型クラッド層は、それぞれAlGaAs層からなる、請求項1に記載の半導体レーザ素子。 - 前記p型クラッド層は、直線状のリッジ部を有しており、
前記半導体レーザ用p側電極は、平面視において、前記リッジ部を含む領域に形成されている、請求項1または2に記載の半導体レーザ素子。 - 前記ヒータは、平面視において、前記リッジ部と平行に配置されている、請求項3に記載の半導体レーザ素子。
- 前記ヒータは、平面視において、直線状に延びている、請求項4に記載の半導体レーザ素子。
- 前記ヒータは、平面視において、蛇行状に延びている、請求項4に記載の半導体レーザ素子。
- 前記ヒータは、前記絶縁膜上に形成されたTi膜と、前記Ti膜上に積層されたPt膜との積層膜から構成されている、請求項1~6のいずれか一項に記載の半導体レーザ素子。
- 基板と、前記基板の表面側に配置されたn型クラッド層と、前記n型クラッド層に対して前記基板とは反対側に配置された活性層と、前記活性層に対して前記n型クラッド層とは反対側に配置されたp型クラッド層とを有する半導体積層構造を含み、
前記半導体積層構造における前記基板側とは反対側の表面には、主半導体レーザとして使用される主半導体レーザ領域と、熱源用半導体レーザとして使用される熱源用半導体レーザ領域とを分離する領域分離溝が形成されており、
前記主半導体レーザ領域において、前記半導体積層構造の前記表面には、前記主半導体レーザのための第1p側電極が形成され、
前記熱源用半導体レーザ領域において、前記半導体積層構造の前記表面には、前記熱源用半導体レーザのための第2p側電極が形成されており、
前記主半導体レーザ領域において、前記p型クラッド層は、直線状の第1リッジ部を有しており、
前記熱源用半導体レーザ領域において、前記p型クラッド層は、直線状の第2リッジ部を有しており、
前記第2リッジ部は、平面視において、間隔をおいて直線状に配置された複数の矩形リッジから構成されている、半導体レーザ素子。 - 前記活性層は、TMモード発振を生じさせるための引っ張り歪みを有する量子井戸層を含み、
前記n型クラッド層およびp型クラッド層は、それぞれAlGaAs層からなる、請求項8に記載の半導体レーザ素子。 - 前記領域分離溝は、前記基板に達している、請求項8または9に記載の半導体レーザ素子。
- 前記半導体積層構造における前記表面とは反対側の裏面には、前記主半導体レーザおよび前記熱源用半導体レーザのためのn側電極が形成されている、請求項8~10のいずれか一項に記載の半導体レーザ素子。
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