JP6807643B2 - 分布帰還型半導体レーザ素子 - Google Patents
分布帰還型半導体レーザ素子 Download PDFInfo
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- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- RBFQJDQYXXHULB-UHFFFAOYSA-N arsane Chemical compound [AsH3] RBFQJDQYXXHULB-UHFFFAOYSA-N 0.000 description 1
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- H01S5/34353—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 based on (AI)GaAs
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- H01S5/00—Semiconductor lasers
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- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
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- Condensed Matter Physics & Semiconductors (AREA)
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Description
・誘電率:ε1、ε2、・・・εm
・屈折率:N1、N2、・・・Nm
・膜厚:W1、W2、・・・Wm
(1)端面出射型DFB半導体レーザ素子
る。
d(1)=9nm
D(1)=2445nm
d(2)=10nm
D(2)=2490nm
d(3)=11nm
D(3)=2515nm
(κ1及びκ3の条件)
・100cm−1≦κ1≦5000cm−1
・50cm−1≦κ3≦5000cm−1
この式を利用して、回折格子層6からエピ厚方向に沿って井戸層厚を9、10、11nmと順次厚く設定し直す。量子井戸層の開始位置を(上述の配置例(A))の設定に配置することで、各量子井戸層の光閉じ込め係数0.0155程度に揃えることが出来る。
活性層内の光強度は一例として2次関数で近似出来、下記の関係式で表わされる。
このとき、N番目の井戸層の開始位置をZN、幅をdNとすると、N番目の井戸層の光閉じ込め係数Γ(N)の一例は、以下の関係式を満たす。
Γ(N)=(AZN 2+BZN+C)dN 2+(AZ+B/2)dN+AdN/3
(2)面発光型DFB半導体レーザ素子
(3)DFBフォトニック結晶半導体レーザ素子
・誘電率:ε1、ε2、・・・εm
・屈折率:N1、N2、・・・Nm
・膜厚:W1、W2、・・・Wm
Claims (8)
- 厚さの異なる複数の井戸層を有する多重量子井戸構造からなる活性層と、
前記活性層と光学的に結合し、2次元周期構造を有するフォトニック結晶を構成する回折格子層と、
前記活性層及び前記回折格子層を挟む一対のクラッド層であって、これらのクラッド層の一方に設けられた電極の開口からレーザ光が出射する該クラッド層と、
を備えた面発光型の分布帰還型半導体レーザ素子であって、
前記クラッド層に挟まれる領域をコア層と規定したとき、
前記回折格子層は、前記コア層の平均屈折率よりも屈折率の高い層を含み、前記活性層よりも前記回折格子層側に光電界強度のピークが位置し、
前記活性層は前記回折格子層から離間し、前記井戸層の数は3層以上であり、これらの井戸層の厚みは、前記回折格子層から離れるほど、厚くなる、
ことを特徴とする分布帰還型半導体レーザ素子。 - 前記回折格子層と前記井戸層の間に、前記コア層を伝播する光に対するモード等価屈折率よりも屈折率の高い層を1層以上含む、
ことを特徴とする請求項1に記載の分布帰還型半導体レーザ素子。 - 前記井戸層の数は3層以上であり、これらの井戸層の材料で規定されるバンドギャップエネルギーは、前記回折格子層から離れるほど、小さくなる、
ことを特徴とする請求項1又は2に記載の分布帰還型半導体レーザ素子。 - Nを自然数とし、
複数の前記井戸層のうち、前記回折格子層に近い方から数えてN番目の井戸層の厚みをd(N)とし、前記N番目の井戸層の光閉じ込め係数をΓ(N)とした場合、Γ(N)の相対的な変化が10%以下である、ことを特徴とする請求項1乃至3のいずれか1項に記載の分布帰還型半導体レーザ素子。 - 前記回折格子層は、AlGaAs系の化合物半導体からなり、
基本層と、
前記基本層とは屈折率の異なる複数の異屈折率領域と、
を備え、
前記異屈折率領域は、前記基本層に垂直な方向から見た平面視において、0度と180度の角度位置を結ぶ横線と、90度と270度の角度位置を結ぶ縦線とからなる正方格子の格子点位置に配置され、前記回折格子層は2次元の正方格子回折格子層を構成し、
90度方向への結合係数κ1と、
180度方向への結合係数κ3とは、
以下の関係式:
100cm−1≦κ1≦5000cm−1
50cm−1≦κ3≦5000cm−1
を満たし、
厚みの方向に単一モードのレーザ光が発生する、
ことを特徴とする請求項1乃至4のいずれか1項に記載の分布帰還型半導体レーザ素子。 - 前記活性層は、前記井戸層間に障壁層を備えており、
前記障壁層のバンドギャップエネルギーは、前記クラッド層のバンドギャップエネルギーよりも低く設定され、
前記井戸層のバンドギャップエネルギーは、前記障壁層のバンドギャップエネルギーよりも低く設定される、
ことを特徴とする請求項5に記載の分布帰還型半導体レーザ素子。 - 前記活性層と前記回折格子層との間に、これらの間のキャリアの移動を抑制するキャリア障壁層を備える、ことを特徴とする請求項1乃至6のいずれか一項に記載の分布帰還型半導体レーザ素子。
- 材料の異なる複数の井戸層を有する多重量子井戸構造からなる活性層と、
前記活性層と光学的に結合し、2次元周期構造を有するフォトニック結晶を構成する回折格子層と、
前記活性層及び前記回折格子層を挟む一対のクラッド層であって、これらのクラッド層の一方に設けられた電極の開口からレーザ光が出射する当該クラッド層と、
を備えた面発光型の分布帰還型半導体レーザ素子であって、
前記クラッド層に挟まれる領域をコア層と規定したとき、
前記回折格子層は、前記コア層の平均屈折率よりも屈折率の高い層を含み、前記活性層よりも前記回折格子層側に光電界強度のピークが位置し、
前記活性層は前記回折格子層から離間し、前記井戸層の数は3層以上であり、これらの井戸層の材料で規定されるバンドギャップエネルギーは、前記回折格子層から離れるほど、小さくなる、
ことを特徴とする分布帰還型半導体レーザ素子。
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DE102017200061.9A DE102017200061A1 (de) | 2016-01-08 | 2017-01-04 | Halbleiterlaserelement mit verteilter Rückkopplung |
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