JPH06105809B2 - Slab type laser element - Google Patents
Slab type laser elementInfo
- Publication number
- JPH06105809B2 JPH06105809B2 JP63162224A JP16222488A JPH06105809B2 JP H06105809 B2 JPH06105809 B2 JP H06105809B2 JP 63162224 A JP63162224 A JP 63162224A JP 16222488 A JP16222488 A JP 16222488A JP H06105809 B2 JPH06105809 B2 JP H06105809B2
- Authority
- JP
- Japan
- Prior art keywords
- total reflection
- slab
- type laser
- shielding member
- laser element
- 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 - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/0606—Crystal lasers or glass lasers with polygonal cross-section, e.g. slab, prism
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0619—Coatings, e.g. AR, HR, passivation layer
- H01S3/0625—Coatings on surfaces other than the end-faces
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、スラブ型レーザー素子に関し、特に、全反射
面上の少なくとも長辺側の縁部に遮光部材が設けられて
いるスラブ型レーザー素子に関する。TECHNICAL FIELD The present invention relates to a slab type laser element, and more particularly, to a slab type laser element in which a light shielding member is provided at least on the long side edge of a total reflection surface. Regarding
通常、スラブ型レーザー素子においては、励起と冷却と
が広い全反射面で行われ、レーザー媒質内部の熱歪によ
る屈折率分布のうち、スラブの厚さ方向及びレーザービ
ームの進行方向の屈折率分布はレーザービームを媒質内
をジグザグに進行させることにより平行化され熱レンズ
効果が補償されている。しかし、これによっては、スラ
ブの幅方向の屈折率分布は補償されない。従来、幅方向
の温度匂配を抑制して屈折率分布を均等化するために、
冷却水の流通経路の工夫がなされたり、断熱材をスラブ
の両側面に接着することが行われている。Usually, in a slab type laser element, excitation and cooling are performed on a wide total reflection surface, and of the refractive index distribution due to thermal strain inside the laser medium, the refractive index distribution in the thickness direction of the slab and the traveling direction of the laser beam. Is collimated by advancing the laser beam in a zigzag manner in the medium to compensate for the thermal lens effect. However, this does not compensate the refractive index profile in the width direction of the slab. Conventionally, to suppress the temperature gradient in the width direction and equalize the refractive index distribution,
Cooling water distribution channels have been devised, and heat insulating materials have been adhered to both sides of the slab.
〔発明が解決しようとする課題〕 しかし、このような方法では、幅方向の温度匂配を十分
に抑制することができず、そのため熱レンズ効果及びそ
れに基づく波面歪みの発生を十分に抑制することができ
ないのが実情である。そのため、安定したレーザー出力
を得ることが困難となっている。[Problems to be Solved by the Invention] However, in such a method, the temperature gradient in the width direction cannot be sufficiently suppressed, and therefore the thermal lens effect and the occurrence of wavefront distortion based on the thermal lens effect can be sufficiently suppressed. The reality is that you cannot do it. Therefore, it is difficult to obtain a stable laser output.
そこで、本発明の目的は、幅方向の温度匂配を効果的に
抑制することができ、それにより波面歪みの発生を十分
に抑制し、安定なレーザー出力が得られるスラブ型レー
ザー素子を提供することにある。Therefore, an object of the present invention is to provide a slab type laser element capable of effectively suppressing the temperature gradient in the width direction, thereby sufficiently suppressing the occurrence of wavefront distortion, and obtaining a stable laser output. Especially.
本発明は、このようなレーザー素子として、２つの平行
な長方形状の全反射面と、該長方形状全反射面の短辺に
連なりレーザービームが入出射する２つの端面と、前記
長方形状全反射面の長辺に連なり前記の全反射面及び端
面と垂直である２つの側面を有するスラブ型レーザー素
子において、 前記２つの長方形状全反射面上の少なくとも長辺側のく
縁部が金属層を備えてなる帯状遮光部材で被覆されてい
ることを特徴とするスラブ型レーザー素子を提供するも
のである。The present invention provides, as such a laser device, two parallel rectangular total reflection surfaces, two end faces which are connected to the short sides of the rectangular total reflection surfaces and which emit and emit a laser beam, and the rectangular total reflection surface. In a slab type laser device having two side surfaces that are continuous with the long side of the surface and are perpendicular to the total reflection surface and the end surface, at least the long side edges of the two rectangular total reflection surfaces form a metal layer. It is intended to provide a slab type laser element characterized by being covered with a band-shaped light shielding member provided.
本発明のスラブ型レーザー素子に用いられる遮光部材
は、金属層を備えてなる帯状の形態で、長方形状全反射
面上の周縁部（即ち、全反射面の長方形の２つの長辺及
び２つの短辺に接する全反射面上の縁部）の少なくとも
長辺側の縁部に設けられる。帯状遮光部材により被覆さ
れるスラブの面積は、得られる温度分布均等化効果に応
じて適宜調整することが望ましいが、例えば、幅0.3〜
0.5cm程度、厚さ１〜2mm程度である。The light shielding member used in the slab type laser device of the present invention is in the form of a strip provided with a metal layer, and has a peripheral portion on the rectangular total reflection surface (that is, two long sides of the rectangle and two rectangles of the total reflection surface). It is provided at least on the long-side edge of the total reflection surface that is in contact with the short side. The area of the slab covered by the band-shaped light-shielding member is preferably adjusted appropriately according to the obtained temperature distribution equalizing effect.
The thickness is about 0.5 cm and the thickness is about 1 to 2 mm.
遮光部材は、全反射面上の少なくとも長辺側の縁部に設
ける必要があるが、短辺側の縁部をも含む周縁部全体に
設けてもよい。The light-shielding member needs to be provided at least on the long-side edge on the total reflection surface, but may be provided on the entire peripheral edge including the short-side edge.
遮光部材の材料としては、例えば、アルミニウム、ステ
ンレス鋼等の金属、シリコン結晶等が挙げられ、表面が
鏡面化されていることが好ましい。この遮光部材は、ス
ラブ上に、例えば、シリコーンシーラント、その他の接
着剤を用いて貼付してもよいし、直接押しつけて固定し
てもよい。Examples of the material of the light shielding member include metals such as aluminum and stainless steel, silicon crystals, and the like, and the surface is preferably mirror-finished. The light shielding member may be attached to the slab by using, for example, a silicone sealant or another adhesive, or may be directly pressed and fixed.
遮光部材は、上記のように金属層のみからなるものでも
よいが、スラブ上に設けられた断熱材料層とその上に設
けられた金属層とからなるものが、遮光作用に加え断熱
作用も有するので、さらに好ましい。断熱材料として
は、例えば、シリコーンゴム、テフロン、ガラス等が挙
げられ、この層は例えば、0.3〜1mmで形成される。The light-shielding member may be made of only the metal layer as described above, but the one made of the heat insulating material layer provided on the slab and the metal layer provided thereon also has a heat insulating action in addition to the light shielding action. Therefore, it is more preferable. Examples of the heat insulating material include silicone rubber, Teflon, glass and the like, and this layer is formed to have a thickness of 0.3 to 1 mm, for example.
上記の遮光部材は、従来スラブの側面に設けられている
断熱材と組み合わせて用いると、一層有効である。The above light-shielding member is more effective when used in combination with a heat insulating material conventionally provided on the side surface of the slab.
本発明のスラブ型レーザー素子に用いられるスラブ媒質
の形状は特に制限されないが、通常、レーザービームを
素子の端面にブリュースタ角で入出射させることができ
るように、素子の端面が全反射面に一定の角度で傾斜し
ているものが代表的である。しかし、本願出願人による
特開平１−272174号公報に記載のスラブ媒質のように端
面の傾斜角度が何ら制約されないものも用いることがで
きる。The shape of the slab medium used in the slab type laser element of the present invention is not particularly limited, but usually, the end surface of the element is a total reflection surface so that the laser beam can enter and exit the end surface of the element at Brewster's angle. The one that is inclined at a constant angle is typical. However, it is also possible to use a slab medium described in Japanese Patent Application Laid-Open No. 1-272174 by the present applicant, in which the inclination angle of the end face is not restricted at all.
スラブの材料も特に制限されず、公知の材料を用いるこ
とができ、例えば、 Nd3+ドープGd3Ga5O12（Nd:GGG）、Nd3+ドープY3Al5O12
（Nd:YAG）等の結晶、ならびにNd3+ドープガラスが挙げ
られる。The material of the slab is not particularly limited, and known materials can be used, and examples thereof include Nd 3 + -doped Gd 3 Ga 5 O 12 (Nd: GGG) and Nd 3 + -doped Y 3 Al 5 O 12
Crystals such as (Nd: YAG), and Nd 3 + -doped glass can be mentioned.
次に、本発明を実施例により具体的に説明する。 Next, the present invention will be specifically described with reference to examples.
第１図は、本発明の素子の一例の平面図を示し、第２図
は同じ素子の立面図を示し、第３図は第１図におけるII
I−III′部分断面図を示す。FIG. 1 shows a plan view of an example of the element of the present invention, FIG. 2 shows an elevation view of the same element, and FIG. 3 shows II in FIG.
The I-III 'partial sectional view is shown.
スラブ媒質１（Nd:GGG）の両端面２、２′は長方形状の
全面社面３、３′の短辺に連なり、かつ全反射面３、
３′に対して傾斜しており、２つの側面４、４′は全反
射面３、３′の長辺側に連なり、かつこれら全反射面及
び端面２、２′に垂直である。全反射面３、３′上の長
辺側の縁部には、幅5mmの帯状遮光部材５が設けられて
いる。遮光部材５は第３図からよくわかるように、スラ
ブ媒質１にシリコーンシーラント６で貼付されたシリコ
ーンゴム層７（厚さ0.5mm）、その上にシリコーンシー
ラント８で貼付されたアルミニウム層９で構成されてい
る。Both end surfaces 2 and 2'of the slab medium 1 (Nd: GGG) are connected to the short sides of the rectangular whole company surface 3 and 3 ', and the total reflection surface 3 is
It is inclined with respect to 3 ', and the two side surfaces 4, 4'continue to the long sides of the total reflection surfaces 3, 3'and are perpendicular to these total reflection surfaces and the end surfaces 2, 2'. A strip-shaped light-shielding member 5 having a width of 5 mm is provided on the long side edges of the total reflection surfaces 3, 3 '. As can be seen clearly from FIG. 3, the light shielding member 5 is composed of a silicone rubber layer 7 (thickness: 0.5 mm) adhered to the slab medium 1 with a silicone sealant 6, and an aluminum layer 9 adhered thereto with a silicone sealant 8. Has been done.
実施例１ 第１図に示す形状の、幅55mm、長さ203mm、厚さ9.5mmの
素子をレーザー媒質１としてNd:GGGを用いて製造した。
両端面２、２′は、全反射面３、３′と31.4度に傾斜し
ている。遮光部材として、厚さ0.5mm、幅5mmのシリコー
ンゴム層とアルミニウム層（厚さ1mm）とからなるもの
を、スラブの全反射面のすべての側縁部に貼付した。こ
の素子を共振器長75cm、全反射鏡の曲率半径2m、出力鏡
の反射立50％、曲率半径2mの条件でレーザー発振波長1.
06μｍ、レーザービームの入射角62.8度、励起ランプ入
力34kwにおいてレーザー発振させたところ、レーザー発
振出力510Wで、30分以上経過しても安定であった。Example 1 A device having a width of 55 mm, a length of 203 mm, and a thickness of 9.5 mm and having a shape shown in FIG. 1 was manufactured by using Nd: GGG as a laser medium 1.
Both end faces 2 and 2'are inclined at 31.4 degrees with respect to the total reflection faces 3 and 3 '. A light shielding member composed of a silicone rubber layer having a thickness of 0.5 mm and a width of 5 mm and an aluminum layer (thickness of 1 mm) was attached to all side edges of the total reflection surface of the slab. This element has a resonator length of 75 cm, a total reflection mirror radius of curvature of 2 m, an output mirror reflection ratio of 50%, and a laser oscillation wavelength of 1.
When laser oscillation was performed at 06 μm, the incident angle of the laser beam was 62.8 degrees, and the excitation lamp input was 34 kw, the laser oscillation output was 510 W and it was stable even after 30 minutes or more.
比較例として、遮光部材を形成しない以外は、実施例１
と同様の構成の素子を用い、上記と同様に、励起ランプ
入力34kwにおいてレーザー発振させたところ、レーザー
発振出力は当初の510Wから５分後に460Wに低下した。As a comparative example, the first embodiment except that the light shielding member is not formed
When a laser was oscillated with an excitation lamp input of 34 kw in the same manner as described above using an element having the same structure as the above, the lasing output decreased from 510 W at the beginning to 460 W after 5 minutes.
本発明のスラブ型レーザー素子は、スラブの側縁に設け
られた遮光部材によりスラブの側部近傍におけるレーザ
ー発振が起こらないので該部分における発熱が抑制され
る。したがって、スラブの幅方向の温度分布が均等化さ
れ、熱レンズ効果及びそれに基づく波面歪みが抑制され
るので安定したレーザー出力を得ることができる。In the slab type laser device of the present invention, the light shielding member provided on the side edge of the slab does not cause laser oscillation in the vicinity of the side portion of the slab, so that heat generation in that portion is suppressed. Therefore, the temperature distribution in the width direction of the slab is equalized, the thermal lens effect and the wavefront distortion based on it are suppressed, and a stable laser output can be obtained.
第１図は、本発明の素子の一例を平面図を示し、第２図
は同じ素子の立面図を示し、第３図は第１図におけるII
I−III′部分断面図を示す。 １……スラブ媒質 ３、３′……全反射面 ５……遮光部材FIG. 1 shows a plan view of an example of the element of the present invention, FIG. 2 shows an elevation view of the same element, and FIG. 3 shows II in FIG.
The I-III 'partial sectional view is shown. 1 ... Slab medium 3, 3 '... Total reflection surface 5 ... Shading member
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−117380（ＪＰ，Ａ) 実開 昭64−39669（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-117380 (JP, A) ACTUAL SHO-64-39669 (JP, U)
Claims (2)
方形状全反射面の短辺に連なりレーザービームが入出射
する２つの端面と、前記長方形状全反射面の長辺に連な
り前記の全反射面及び端面と垂直である２つの側面を有
するスラブ型レーザー素子において、 前記２つの長方形状全反射面上の少なくとも長辺側の縁
部が金属層を備えてなる帯状遮光部材で被覆されている
ことを特徴とするスラブ型レーザー素子。1. Two parallel rectangular total reflection surfaces, two end surfaces connected to the short sides of the rectangular total reflection surface where a laser beam enters and exits, and continuous to the long sides of the rectangular total reflection surface. In the slab type laser device having two side surfaces perpendicular to the total reflection surface and the end surface, a strip-shaped light shielding member having a metal layer at least on the long side edge of the two rectangular total reflection surfaces. A slab type laser element characterized by being coated.
ザー素子において、前記の遮光部材がスラブ上に設けら
れた断熱材料層とその上に設けられた金属層とを有して
なるスラブ型レーザー素子。2. The slab type laser element according to claim 1, wherein the light shielding member has a heat insulating material layer provided on the slab and a metal layer provided thereon. Type laser element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63162224A JPH06105809B2 (en) | 1988-06-28 | 1988-06-28 | Slab type laser element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63162224A JPH06105809B2 (en) | 1988-06-28 | 1988-06-28 | Slab type laser element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0210784A JPH0210784A (en) | 1990-01-16 |
| JPH06105809B2 true JPH06105809B2 (en) | 1994-12-21 |
Family
ID=15750330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63162224A Expired - Fee Related JPH06105809B2 (en) | 1988-06-28 | 1988-06-28 | Slab type laser element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06105809B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4653061A (en) * | 1985-09-19 | 1987-03-24 | Amada Engineering & Service Co., Inc. | Slab geometry laser device |
| JPS6439669A (en) * | 1987-08-05 | 1989-02-09 | Mitsubishi Electric Corp | Magnetic disk device |
-
1988
- 1988-06-28 JP JP63162224A patent/JPH06105809B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0210784A (en) | 1990-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |