JPH0426558B2 - - Google Patents

Info

Publication number
JPH0426558B2
JPH0426558B2 JP60062803A JP6280385A JPH0426558B2 JP H0426558 B2 JPH0426558 B2 JP H0426558B2 JP 60062803 A JP60062803 A JP 60062803A JP 6280385 A JP6280385 A JP 6280385A JP H0426558 B2 JPH0426558 B2 JP H0426558B2
Authority
JP
Japan
Prior art keywords
face
active layer
laser diode
resonator
laser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP60062803A
Other languages
Japanese (ja)
Other versions
JPS61220394A (en
Inventor
Shoichi Kakimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP6280385A priority Critical patent/JPS61220394A/en
Publication of JPS61220394A publication Critical patent/JPS61220394A/en
Publication of JPH0426558B2 publication Critical patent/JPH0426558B2/ja
Granted legal-status Critical Current

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  • Semiconductor Lasers (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、高出力動作の可能なレーザダイオー
ドの製造方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a laser diode capable of high output operation.

〔従来の技術〕[Conventional technology]

レーザダイオードの従来例を第3図に示す。第
3図において、1はN型GaAs基板、2はN型
AlyGa1-yAsクラツド層、3はP型AlxGa1-xAs活
性層、4はP型AlyGa1-yAsクラツド層、5はP
型GaAsコンタクト層、6はレーザ共振器の一端
面を形成する劈開面としての共振器端面、11は
N型電極、12はP型電極であり、y>xとなる
ように構成されている。第3図では左側の共振器
端面6のみを示したが、右側部分にも共振器端面
を構成する劈開面が存在する。
A conventional example of a laser diode is shown in FIG. In Figure 3, 1 is an N-type GaAs substrate, 2 is an N-type
Al y Ga 1-y As clad layer, 3 is P-type Al x Ga 1-x As active layer, 4 is P-type Al y Ga 1-y As clad layer, 5 is P
A type GaAs contact layer, 6 a resonator end face serving as a cleavage plane forming one end face of the laser resonator, 11 an N-type electrode, and 12 a P-type electrode, are configured so that y>x. In FIG. 3, only the left side resonator end face 6 is shown, but there is also a cleavage plane forming the resonator end face on the right side.

次にこのように構成された装置の動作について
説明する。電極11,12間に順バイアスを印加
すると、活性層3へ電子が注入され、正孔と再結
合する際に光を発生する。印加電圧を大きくして
注入レベルをあるしきい値レベルまで上げると、
誘導放出による光の発生の割合が吸収や端面によ
る損失の割合に等しくなりレーザ発振を開始す
る。このようにレーザ光は活性層3内で発生する
が、この光は上下クラツド層2,4に比べて屈折
率の大きい活性層3内を主に導波し、共振器端面
6を通して外部へ一部放射される。
Next, the operation of the apparatus configured as described above will be explained. When a forward bias is applied between the electrodes 11 and 12, electrons are injected into the active layer 3, and light is generated when they recombine with holes. When the applied voltage is increased to increase the injection level to a certain threshold level,
The rate of light generation due to stimulated emission becomes equal to the rate of loss due to absorption and end faces, and laser oscillation begins. As described above, the laser light is generated within the active layer 3, but this light is mainly guided within the active layer 3, which has a higher refractive index than the upper and lower cladding layers 2 and 4, and is unified to the outside through the cavity end face 6. part is radiated.

以上述べたようにレーザ光は活性層3内で発生
するが、その波長に相当するエネルギーは、この
活性層3のバンドギヤツプエネルギーよりも僅か
に大きい。そのため活性層3での吸収は自由電子
によるものでごく小さいが、共振器端面6の近傍
では表面準位の吸収があり、さらにその吸収によ
る発熱が実効的なバンドギヤツプエネルギーを狭
めるため、吸収効果が大きくなつている。
As described above, the laser light is generated within the active layer 3, and the energy corresponding to its wavelength is slightly larger than the bandgap energy of the active layer 3. Therefore, absorption in the active layer 3 is due to free electrons and is very small, but near the cavity end face 6 there is absorption by surface states, and the heat generated by this absorption narrows the effective band gap energy. The absorption effect is increasing.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述の従来のレーザダイオードを動作させる場
合に高出力動作を行わせると、レーザダイオード
自身から発生するレーザ光の共振器端面6の近傍
での吸収による発熱効果が大きくなり、ある限界
出力に至ると共振器端面6の近傍が熱で破壊され
てレーザダイオードが故障してしまうという問題
があつた。
When the above-mentioned conventional laser diode is operated at high output, the heat generation effect due to the absorption of the laser light generated from the laser diode itself near the cavity end face 6 increases, and when a certain limit output is reached, There was a problem in that the vicinity of the resonator end face 6 was destroyed by heat, resulting in a failure of the laser diode.

本発明はこのような点に鑑みてなされたもので
あり、その目的とするところは、高出力動作状態
においても共振器端面近傍での吸収が少なく、従
つて発熱による共振器端面の損傷を押さえた高出
力レーザダイオードの製造方法を提供することに
ある。
The present invention has been made in view of these points, and its purpose is to reduce absorption in the vicinity of the resonator end face even in high output operating conditions, thereby suppressing damage to the resonator end face due to heat generation. An object of the present invention is to provide a method for manufacturing a high-power laser diode.

〔問題点を解決するための手段〕[Means for solving problems]

本発明によるレーザダイオードの製造方法は、
共振器端面形成前にあらかじめ外部から共振器端
面相当位置にレーザ光を照射し、このレーザ光に
より共振器端面近傍の活性層のAlモル比を共振
器内部に比べて大きくするようにするものであ
る。
The method for manufacturing a laser diode according to the present invention includes:
Before forming the resonator end face, a laser beam is irradiated from the outside at a position corresponding to the resonator end face, and this laser light is used to increase the Al molar ratio in the active layer near the resonator end face compared to the inside of the resonator. be.

〔作用〕[Effect]

本発明においては、共振器端面近傍での活性層
のAlモル比が共振器内部に比べて大きくなつて
いるため、共振器端面付近でのレーザ光の吸収が
押さえられる。
In the present invention, since the Al molar ratio of the active layer near the resonator end face is larger than that inside the resonator, absorption of laser light near the resonator end face can be suppressed.

〔実施例〕〔Example〕

本発明に係わるレーザダイオードの製造方法の
一実施例により形成されるレーザダイオードの構
成を第1図に示す。第1図において、斜線の領域
7は、共振器端面6を形成する前にあらかじめレ
ーザ光照射を受けて溶融し、活性層3に比べて
Alモル比の大きいクラツド層2,4内のAlが活
性層3内へ拡散したため、元のAlモル比よりも
大きくなつている部分で、Alx1Ga1-x1As(x<x1
<y)領域である。第1図において第3図と同一
部分又は相当部分には同一符号が付してある。
FIG. 1 shows the structure of a laser diode formed by an embodiment of the laser diode manufacturing method according to the present invention. In FIG. 1, the shaded area 7 is melted by laser beam irradiation before forming the resonator end face 6, and is smaller than the active layer 3.
Since Al in the cladding layers 2 and 4 with a high Al molar ratio diffused into the active layer 3, Al x1 Ga 1-x1 As (x<x1
<y) area. In FIG. 1, the same or equivalent parts as in FIG. 3 are given the same reference numerals.

レーザ光照射によるAlx1Ga1-x1As領域7の形
成は、たとえば、以下のようにして行われる。第
2図に示すように、あらかじめエピタキシヤル成
長や電極形成を終了し、まだ個々の素子に分離さ
れていないレーザダイオードウエハに対して、共
振器端面に相当する線に沿つてウエハ上方よりレ
ーザ光を照射する。この場合、照射位置のGaAs
コンタクト層5があらかじめ取り除かれており、
照射レーザ光の波長相当エネルギーがAlxGa1-x
As活性層3のバンドギヤツプエネルギーよりも
大きく、AlyGa1-yAsクラツド層2,4のバンド
ギヤツプエネルギーよりも小さければ、照射レー
ザ光は活性層3内で有効に吸収される。そうする
と、その吸収部分の近傍が溶融し、上下のクラツ
ド層2,4のAlの拡散が生じて、活性層3自体
のAlモル比は増大する。しかる御照射部の中心
位置で劈開すれば、第1図に示すレーザダイオー
ドが得られる。
Formation of the Al x1 Ga 1-x1 As region 7 by laser beam irradiation is performed, for example, as follows. As shown in Figure 2, a laser diode wafer that has undergone epitaxial growth and electrode formation and has not yet been separated into individual devices is exposed to a laser beam from above the wafer along a line corresponding to the cavity end face. irradiate. In this case, GaAs at the irradiation position
The contact layer 5 has been removed beforehand,
The energy equivalent to the wavelength of the irradiated laser beam is Al x Ga 1-x
If the bandgap energy is larger than the bandgap energy of the As active layer 3 and smaller than the bandgap energy of the Al y Ga 1-y As cladding layers 2 and 4, the irradiated laser light is effectively absorbed within the active layer 3. Ru. Then, the vicinity of the absorbing portion melts, causing diffusion of Al in the upper and lower cladding layers 2 and 4, and the Al molar ratio of the active layer 3 itself increases. By cleaving at the center of the irradiation part, the laser diode shown in FIG. 1 can be obtained.

このように本実施例においては、共振器端面6
の近傍で活性層3のAlモル比が共振器内部に比
べて大きくなつており、吸収が少なくなつている
ので、従来のレーザダイオードに比べて共振器端
面における光吸収損傷を受けにくく、高出力動作
が可能である。
In this way, in this embodiment, the resonator end face 6
The Al molar ratio of the active layer 3 near the cavity is larger than that inside the cavity, and absorption is reduced. Therefore, compared to conventional laser diodes, the cavity facets are less susceptible to light absorption damage and can achieve high output. Operation is possible.

また本実施例ではAl−Ga−As系のレーザダイ
オードについて説明したが、他の成分系のレーザ
ダイオードにも適用できる事は勿論である。
Further, in this embodiment, an Al--Ga--As based laser diode has been described, but it goes without saying that the present invention can also be applied to laser diodes based on other components.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、共振器端面近傍
の活性層のAlモル比を共振器内部に比べて大き
くしたことにより、共振器端面近傍における活性
層のバンドギヤツプエネルギーを共振器内部より
も大きくでき、高出力動作可能なレーザダイオー
ドを得ることができる効果がある。
As explained above, the present invention makes the Al molar ratio of the active layer near the resonator end face larger than that inside the resonator, thereby reducing the bandgap energy of the active layer near the resonator end face from inside the resonator. This has the effect of making it possible to obtain a laser diode capable of high output operation.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係わるレーザダイオードの製
造方法の一実施例により形成されるレーザダイオ
ードの構成を示す断面図、第2図はその製造方法
の一実施例を説明するための断面図、第3図は従
来のレーザダイオードを示す断面図である。 1……N型GaAs基板、2……N型クラツド
層、3……P型活性層、4……P型クラツド層、
5……P型GaAsコンタクト層、6……共振器端
面、7……領域、11,12……電極。
FIG. 1 is a sectional view showing the structure of a laser diode formed by an embodiment of the method for manufacturing a laser diode according to the present invention, FIG. 2 is a sectional view for explaining an embodiment of the manufacturing method, and FIG. FIG. 3 is a sectional view showing a conventional laser diode. 1... N-type GaAs substrate, 2... N-type cladding layer, 3... P-type active layer, 4... P-type cladding layer,
5... P-type GaAs contact layer, 6... Resonator end face, 7... Region, 11, 12... Electrode.

Claims (1)

【特許請求の範囲】[Claims] 1 クラツド層−活性層−クラツド層から構成さ
れたレーザダイオードの製造方法において、共振
器端面形成前にあらかじめ外部から共振器端面相
当位置にレーザ光を照射し、このレーザ光により
共振器端面近傍の活性層のAlモル比を共振器内
部に比べて大きくすることを特徴とするレーザダ
イオードの製造方法。
1. In a method for manufacturing a laser diode composed of a cladding layer, an active layer, and a cladding layer, a laser beam is irradiated from the outside to a position corresponding to the cavity endface before forming the cavity endface, and the laser beam is used to illuminate the area near the cavity endface. A method for manufacturing a laser diode, characterized in that the Al molar ratio of the active layer is made larger than that of the inside of the resonator.
JP6280385A 1985-03-26 1985-03-26 How to manufacture a laser diode Granted JPS61220394A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6280385A JPS61220394A (en) 1985-03-26 1985-03-26 How to manufacture a laser diode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6280385A JPS61220394A (en) 1985-03-26 1985-03-26 How to manufacture a laser diode

Publications (2)

Publication Number Publication Date
JPS61220394A JPS61220394A (en) 1986-09-30
JPH0426558B2 true JPH0426558B2 (en) 1992-05-07

Family

ID=13210859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6280385A Granted JPS61220394A (en) 1985-03-26 1985-03-26 How to manufacture a laser diode

Country Status (1)

Country Link
JP (1) JPS61220394A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0821756B2 (en) * 1986-10-31 1996-03-04 セイコーエプソン株式会社 Semiconductor laser manufacturing method
JP2545233B2 (en) * 1987-07-02 1996-10-16 セイコーエプソン株式会社 Method for manufacturing semiconductor laser
JP2629190B2 (en) * 1987-07-24 1997-07-09 セイコーエプソン株式会社 Manufacturing method of semiconductor laser
JP2629722B2 (en) * 1987-08-06 1997-07-16 セイコーエプソン株式会社 Manufacturing method of semiconductor laser
JP2629194B2 (en) * 1987-08-28 1997-07-09 セイコーエプソン株式会社 Manufacturing method of semiconductor laser
JP2679057B2 (en) * 1987-09-10 1997-11-19 セイコーエプソン株式会社 Manufacturing method of semiconductor laser
JP2687668B2 (en) * 1990-04-17 1997-12-08 日本電気株式会社 High power semiconductor laser device and manufacturing method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5527474B2 (en) * 1971-12-17 1980-07-21

Also Published As

Publication number Publication date
JPS61220394A (en) 1986-09-30

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