JP2000183455A - Semiconductor laser - Google Patents

Semiconductor laser

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Publication number
JP2000183455A
JP2000183455A JP10362054A JP36205498A JP2000183455A JP 2000183455 A JP2000183455 A JP 2000183455A JP 10362054 A JP10362054 A JP 10362054A JP 36205498 A JP36205498 A JP 36205498A JP 2000183455 A JP2000183455 A JP 2000183455A
Authority
JP
Japan
Prior art keywords
semiconductor laser
light
face
layer
electrode
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.)
Pending
Application number
JP10362054A
Other languages
Japanese (ja)
Inventor
Mamoru Hihara
衛 日原
Shinji Iio
晋司 飯尾
Masayuki Suehiro
雅幸 末広
Hideki Takeda
英樹 武田
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa 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 Yokogawa Electric Corp filed Critical Yokogawa Electric Corp
Priority to JP10362054A priority Critical patent/JP2000183455A/en
Publication of JP2000183455A publication Critical patent/JP2000183455A/en
Pending legal-status Critical Current

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  • Semiconductor Lasers (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve degradation after treatment of sulfide by providing an optical blocking part which blocks light incidence to vicinities of the ends of a semiconductor. SOLUTION: An n-electrode 1 is formed on a substrate 20, and AlGaAs layers 2-4 which have different contents are formed on the n-electrode 1. An undisordered active layer 5 is formed on the surface of the AlGaAs layer 3, a disordered active layer 6 is formed surrounding the active layer 5. A diffraction grating 7 is formed in the AlGaAs layer 4. An insulating layer 8 is formed by covering the side and the surface excluding the top face of the projected port of the AlGaAs layer 4. A shielding film 10 is formed on both ends of the semiconductor laser by being insulated with a groove 11 in between from a p-electrode. The shielding film 11 functions as a film preventing light from intruding into laser. As a result, generation of flaws on the end surface can be restrained by treatment of sulfide due to suppression of generation of a carrier caused by light, thereby a semiconductor laser having no degradation can be obtained.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、半導体レーザに関
し、出射端面の特性劣化の防止を図った半導体レーザに
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor laser, and more particularly, to a semiconductor laser which prevents deterioration of characteristics at an emission end face.

【0002】[0002]

【従来の技術】ファブリペロー型,分布帰還形または分
布ブラッグ反射器型などの半導体レーザでは、高出力化
を実現するために光の出射端面に保護膜が形成される。
半導体レーザの劣化の原因の一つとして光の出射端面の
劣化や破壊がある。この出射端面の劣化は端面の温度上
昇が原因で生じていると考えられている。
2. Description of the Related Art In a semiconductor laser such as a Fabry-Perot type, a distributed feedback type, or a distributed Bragg reflector type, a protective film is formed on a light emitting end face in order to realize a high output.
One of the causes of the deterioration of the semiconductor laser is deterioration or destruction of the light emitting end face. It is considered that the deterioration of the emission end face is caused by the temperature rise of the end face.

【0003】この端面の温度上昇はへき開面に酸素分子
などが吸着し、その結果表面準位が形成され、この表面
準位で光が吸収されることによるものであるが、最終的
には端面が溶けて破壊されることにより発振が止まる。
[0003] This temperature rise at the end face is due to the adsorption of oxygen molecules and the like on the cleaved face, resulting in the formation of surface levels and the absorption of light at these surface levels. Oscillation is stopped by melting and breaking.

【0004】空気中では前述の酸素分子の吸着は一瞬の
うちに起こり、特にAlGaAs系では酸化が生じ易
い。出射端面の劣化を防ぐ手段としては、 端面近傍を窓(光の吸収による端面の温度上昇を防
ぐために端面付近のバンドギャップを故意に広げる)構
造にする。 端面保護膜を形成する。 などの対策が取られる。
[0004] In air, the above-mentioned adsorption of oxygen molecules occurs instantaneously, and particularly in the case of AlGaAs, oxidation is liable to occur. As a means for preventing deterioration of the emission end face, a window structure is used near the end face (a band gap near the end face is intentionally widened in order to prevent a rise in temperature of the end face due to light absorption). An end face protective film is formed. And other measures are taken.

【0005】端面保護膜の形成方法としては従来、端面
の酸化膜を除去し、不動体(passivate)化するために
硫化物(NH4S)処理を行っていた。
Conventionally, as a method of forming the end face protective film, a sulfide (NH 4 S) treatment has been performed to remove the oxide film on the end face and to make the end face passivate.

【0006】[0006]

【発明が解決しようとする課題】ところで、端面保護膜
形成のために硫化物(NH4S)処理(半導体レーザを
硫化物に所定時間浸しながら15秒程度攪拌)を行う
と、膜形成後にレーザの特性が著しく劣化するという問
題があった。なお、従来は 窓領域には電流を流さな
い。 窓領域にまで電極を形成すると、デバイスをバー状
にへき開したときに、光出射部分に電極が被さる可能性
がある。などの理由で端面部の窓領域には電極の形成は
行っていない。本発明はこの硫化物処理後の劣化の改善
を行うことを目的とする。
By the way, when a sulfide (NH 4 S) treatment (agitating the semiconductor laser in the sulfide for a predetermined time and stirring for about 15 seconds) is performed to form the end face protective film, the laser is formed after the film is formed. However, there is a problem that the characteristics of the above-mentioned are significantly deteriorated. Conventionally, no current flows in the window area. If the electrode is formed up to the window area, the electrode may cover the light emitting portion when the device is cleaved in a bar shape. For this reason, no electrode is formed in the window region on the end face. An object of the present invention is to improve deterioration after the sulfide treatment.

【0007】[0007]

【課題を解決するための手段】このような目的を達成す
るために本発明では、請求項1においては端面付近に半
導体層への光の入射を阻止する光阻止部材を設けたこと
を特徴とする。請求項2においては、請求項1記載の半
導体レーザにおいて、光阻止部材を光を吸収する物質と
したことを特徴とする。求項3においては、請求項1記
載の半導体レーザにおいて、光阻止部材を光を反射する
物質としたことを特徴とする。請求項4においては、請
求項3記載の半導体レーザにおいて、光阻止部材を金属
薄膜としたことを特徴とする。請求項5においては、請
求項1記載の半導体レーザはファブリペロー型または分
布帰還形または分布ブラッグ反射器型であることを特徴
とする。
According to the present invention, a light blocking member for blocking light from entering a semiconductor layer is provided near an end face in the present invention. I do. According to a second aspect, in the semiconductor laser according to the first aspect, the light blocking member is made of a material that absorbs light. According to claim 3, in the semiconductor laser according to claim 1, the light blocking member is made of a material that reflects light. According to a fourth aspect, in the semiconductor laser according to the third aspect, the light blocking member is a metal thin film. According to a fifth aspect of the present invention, the semiconductor laser according to the first aspect is of a Fabry-Perot type, a distributed feedback type, or a distributed Bragg reflector type.

【0008】[0008]

【発明の実施の形態】以下図面を用いて本発明を詳しく
説明する。図1は本発明の請求項1に係る半導体レーザ
の一部断面構成図である。図において、20は〜100
μm程度のGaAs基板であり、この基板20上にはA
uGe/Auからなるn電極1が形成され、このn電極
1の上に含有量の異なるAlGaAs層2,3,4が形
成されている。この2,3,4のAlGaAs層の厚さ
は順に1.7μm,0.01μm,2.0μm程度であ
る。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial sectional configuration diagram of a semiconductor laser according to claim 1 of the present invention. In the figure, 20 is ~ 100
A GaAs substrate of about μm,
An n-electrode 1 made of uGe / Au is formed, and AlGaAs layers 2, 3, and 4 having different contents are formed on the n-electrode 1. The thicknesses of the 2, 3, and 4 AlGaAs layers are about 1.7 μm, 0.01 μm, and 2.0 μm, respectively.

【0009】なお、この実施例ではAlGaAs層4は
中央部が凸状に形成されている。この凸部は高さ1.5
μm,幅2.0μm,長さ500μm程度である。5は
3のAlGaAs層の表面に形成された無秩序化されて
いない活性層、6は無秩序化された活性層で無秩序化さ
れていない活性層5を囲むように形成されている。
In this embodiment, the AlGaAs layer 4 has a convex central portion. This projection has a height of 1.5
μm, width 2.0 μm, and length 500 μm. Reference numeral 5 denotes a non-disordered active layer formed on the surface of the AlGaAs layer 3, and reference numeral 6 denotes a disordered active layer formed so as to surround the non-disordered active layer 5.

【0010】7はAlGaAs層4中に形成された回折
格子である。8はSiO2からなる絶縁層で、AlGa
As層4の凸部の上面を除く側面と表面を覆って形成さ
れている。9は凸部の上面を含むAlGaAs層4の側
面と表面を覆って形成されたCr/AuからなるP電極
である。
Reference numeral 7 denotes a diffraction grating formed in the AlGaAs layer 4. 8 is an insulating layer made of SiO 2 ,
The As layer 4 is formed so as to cover the side surface and the surface excluding the upper surface of the convex portion. Reference numeral 9 denotes a P electrode made of Cr / Au formed to cover the side and surface of the AlGaAs layer 4 including the upper surface of the projection.

【0011】10は遮蔽膜であり、半導体レーザの両端
にP電極とは溝11を隔て絶縁されて形成されている。
この遮蔽膜10は幅tが50μm,厚さ0.3μm程度
であり光を反射する金属で形成されている。この遮蔽膜
11は光のレーザ内への侵入防止膜として機能する。本
発明ではこの遮蔽膜10を形成後硫化物処理(レーザを
硫化物に所定時間浸しながら15秒程度攪拌)を行う。
Reference numeral 10 denotes a shielding film, which is formed at both ends of the semiconductor laser so as to be insulated from the P electrode with a groove 11 therebetween.
The shielding film 10 has a width t of about 50 μm and a thickness of about 0.3 μm, and is formed of a metal that reflects light. The shielding film 11 functions as a film for preventing light from entering the laser. In the present invention, after forming the shielding film 10, a sulfide treatment (agitating for about 15 seconds while immersing the laser in the sulfide for a predetermined time) is performed.

【0012】図2は本発明の遮蔽膜10を形成しない前
の状態で硫化物処理を行ったレーザ端部の顕微鏡写真を
示すもので、図によれば凸部の下の矢印Aで示す端面に
線状のキズ(穴…長さ1.5μm,幅0.1μm程度)
が発生していることが分かる。このキズはデバイスの端
面や上面に照射された周囲光によって発生したキャリア
が活性層付近に蓄積し、その蓄積された層が硫化物によ
って選択的にエッチングされたものと推定される。
FIG. 2 is a photomicrograph of a laser end portion subjected to a sulfide treatment before the formation of the shielding film 10 of the present invention. Linear scratches (holes: length 1.5 μm, width 0.1 μm)
It can be seen that is occurring. This flaw is presumed to be caused by carriers generated by ambient light irradiated on the end face and the top face of the device accumulating near the active layer, and the accumulated layer being selectively etched by sulfide.

【0013】図3は本発明の遮蔽膜10を形成した状態
で硫化物処理を行ったレーザ端部の顕微鏡写真を示すも
ので、図によれば凸部の下の矢印A’で示す部分のキズ
は発生していないことが分かる。即ち、遮蔽膜10によ
り上述の光によるキャリアの発生が抑制されたものと推
定される。なお、光は遮蔽膜がない端面からも侵入して
キャリアが蓄積することが考えられるが、バンドギャッ
プの関係から生成されるキャリアは少ないものと推定さ
れる。
FIG. 3 is a photomicrograph of a laser end portion subjected to a sulfide treatment in a state where the shielding film 10 of the present invention is formed. It can be seen that no scratch has occurred. That is, it is estimated that the generation of carriers due to the light is suppressed by the shielding film 10. Although light may enter from the end face without the shielding film and accumulate carriers, it is presumed that few carriers are generated due to the band gap.

【0014】図4は図2に示す端面に線状のキズ(穴)
が発生している状態の半導体レーザの端面に保護膜とし
ての(N−H42S溶液による処理(窒化膜形成)を施
した後、電極に電圧を印加した場合の光出力特性を示す
もので、2.5V程度の電圧を印加して100mA程度
の電流が流れたとしても、光出力は1mW以下であり、
半導体レーザとして機能していないことが分かる。
FIG. 4 shows a linear scratch (hole) on the end face shown in FIG.
FIG. 4 shows the optical output characteristics when a voltage is applied to the electrode after a treatment (nitride film formation) with a (N—H 4 ) 2 S solution as a protective film is performed on the end face of the semiconductor laser in which the cracks are generated. Even if a current of about 100 mA flows when a voltage of about 2.5 V is applied, the light output is 1 mW or less,
It turns out that it does not function as a semiconductor laser.

【0015】図5は図3に示す端面にキズのない半導体
レーザの端面に同様に窒化膜を形成した後、電極に電圧
を印加した場合の光出力特性を示すもので、2.5V程
度の電圧を印加して60mA程度の電流が流れた状態で
光出力が10mW程度となり、半導体レーザとして機能
していることが分かる。
FIG. 5 shows the optical output characteristics when a voltage is applied to the electrodes after a nitride film is formed on the end face of the semiconductor laser without any flaws on the end face shown in FIG. The optical output is about 10 mW in a state where a voltage is applied and a current of about 60 mA flows, which indicates that the semiconductor laser functions as a semiconductor laser.

【0016】なお、本発明の以上の説明は、説明および
例示を目的として特定の好適な実施例を示したに過ぎな
い。したがって本発明はその本質から逸脱せずに多くの
変更、変形をなし得ることは当業者に明らかである。例
えば、図1に記載した半導体レーザの形状は任意に変更
可能であり、回折格子はなくてもよく要は出射端面に光
遮蔽膜を有するものであればよい。特許請求の範囲の欄
の記載により定義される本発明の範囲は、その範囲内の
変更、変形を包含するものとする。
It is to be noted that the above description of the present invention has been presented by way of illustration and example only, and of particular preferred embodiments. Thus, it will be apparent to one skilled in the art that the present invention may be modified or modified in many ways without departing from its essentials. For example, the shape of the semiconductor laser shown in FIG. 1 can be arbitrarily changed, and there is no need for a diffraction grating. The scope of the present invention, which is defined by the description in the appended claims, is intended to cover alterations and modifications within the scope.

【0017】[0017]

【発明の効果】以上説明したように本発明によれば、半
導体レーザの端面付近に半導体層への光の入射を阻止す
る光阻止部材を設けたので、光によるキャリアの発生が
抑制され硫化物処理による端面のキズの発生を抑制する
ことができる。従ってこの部分に保護膜を形成すること
ができ劣化のない半導体レーザを実現することができ
る。
As described above, according to the present invention, a light blocking member for blocking light from entering the semiconductor layer is provided near the end face of the semiconductor laser, so that generation of carriers by light is suppressed and sulfides are suppressed. Generation of scratches on the end face due to the processing can be suppressed. Therefore, a protective film can be formed on this portion, and a semiconductor laser without deterioration can be realized.

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

【図1】本発明に係る半導体レーザの実施の形態の一例
を示す一部断面構成図である。
FIG. 1 is a partial cross-sectional configuration diagram showing an example of an embodiment of a semiconductor laser according to the present invention.

【図2】遮蔽膜を形成しない前の状態で硫化物処理を行
ったレーザ端部の顕微鏡写真である。
FIG. 2 is a micrograph of a laser end portion subjected to a sulfide treatment before a shielding film is formed.

【図3】遮蔽膜10を形成した状態で硫化物処理を行っ
た半導体レーザ端部の顕微鏡写真である。
FIG. 3 is a micrograph of a semiconductor laser end portion subjected to a sulfide treatment in a state where a shielding film 10 is formed.

【図4】端面に線状のキズ(穴)を有する半導体レーザ
の電圧/電流−光出力特性を示す図である。
FIG. 4 is a diagram showing voltage / current-light output characteristics of a semiconductor laser having a linear scratch (hole) on an end face.

【図5】端面にキズのない半導体レーザの電圧/電流−
光出力特性を示す図である。
FIG. 5 is a graph showing the voltage / current of a semiconductor laser having no scratches on the end face
FIG. 4 is a diagram illustrating light output characteristics.

【符号の説明】[Explanation of symbols]

1 n電極 2 AlGaAs層 3 AlGaAs層 4 AlGaAs層 5 無秩序化されていない活性層 6 無秩序化された活性層 7 回折格子 8 SiO2 9 p電極 10 遮蔽膜 11 溝 20 GaAs基板Reference Signs List 1 n electrode 2 AlGaAs layer 3 AlGaAs layer 4 AlGaAs layer 5 non-disordered active layer 6 disordered active layer 7 diffraction grating 8 SiO 2 9 p electrode 10 shielding film 11 groove 20 GaAs substrate

───────────────────────────────────────────────────── フロントページの続き (72)発明者 武田 英樹 東京都武蔵野市中町2丁目9番32号 横河 電機株式会社内 Fターム(参考) 5F073 AA13 AA64 AA87 CA05 CB02 CB22 DA35 EA28 HA10  ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hideki Takeda 2-9-132 Nakamachi, Musashino-shi, Tokyo F-term in Yokogawa Electric Corporation (reference) 5F073 AA13 AA64 AA87 CA05 CB02 CB22 DA35 EA28 HA10

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】端面付近に半導体層への光の入射を阻止す
る光阻止部材を設けたことを特徴とする半導体レーザ。
1. A semiconductor laser comprising a light blocking member provided near an end face for blocking light from entering a semiconductor layer.
【請求項2】光阻止部材は光を吸収する物質であること
を特徴とする請求項1記載の半導体レーザ。
2. The semiconductor laser according to claim 1, wherein the light blocking member is a substance that absorbs light.
【請求項3】光阻止部材は光を反射する物質であること
を特徴とする請求項1記載の半導体レーザ。
3. The semiconductor laser according to claim 1, wherein the light blocking member is a material that reflects light.
【請求項4】光阻止部材は金属薄膜であることを特徴と
する請求項3記載の半導体レーザ。
4. The semiconductor laser according to claim 3, wherein said light blocking member is a metal thin film.
【請求項5】ファブリペロー型または分布帰還形または
分布ブラッグ反射器型であることを特徴とする請求項1
記載の半導体レーザ。
5. A Fabry-Perot type, a distributed feedback type, or a distributed Bragg reflector type.
A semiconductor laser as described in the above.
JP10362054A 1998-12-21 1998-12-21 Semiconductor laser Pending JP2000183455A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10362054A JP2000183455A (en) 1998-12-21 1998-12-21 Semiconductor laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10362054A JP2000183455A (en) 1998-12-21 1998-12-21 Semiconductor laser

Publications (1)

Publication Number Publication Date
JP2000183455A true JP2000183455A (en) 2000-06-30

Family

ID=18475758

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10362054A Pending JP2000183455A (en) 1998-12-21 1998-12-21 Semiconductor laser

Country Status (1)

Country Link
JP (1) JP2000183455A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002158398A (en) * 2000-11-20 2002-05-31 Mitsubishi Electric Corp Distribution feedback type laser and manufacturing method thereof
JP2014029941A (en) * 2012-07-31 2014-02-13 Fujitsu Ltd Optical semiconductor device and optical semiconductor device manufacturing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002158398A (en) * 2000-11-20 2002-05-31 Mitsubishi Electric Corp Distribution feedback type laser and manufacturing method thereof
JP2014029941A (en) * 2012-07-31 2014-02-13 Fujitsu Ltd Optical semiconductor device and optical semiconductor device manufacturing method

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