JPS63141382A - Solid state laser oscillator - Google Patents
Solid state laser oscillatorInfo
- Publication number
- JPS63141382A JPS63141382A JP28676086A JP28676086A JPS63141382A JP S63141382 A JPS63141382 A JP S63141382A JP 28676086 A JP28676086 A JP 28676086A JP 28676086 A JP28676086 A JP 28676086A JP S63141382 A JPS63141382 A JP S63141382A
- Authority
- JP
- Japan
- Prior art keywords
- state laser
- mirror
- laser medium
- solid state
- light
- 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.)
- Granted
Links
- 239000007787 solid Substances 0.000 title abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 4
- 230000008646 thermal stress Effects 0.000 abstract description 10
- 230000005284 excitation Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract 5
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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
-
- 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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0818—Unstable resonators
-
- 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
- H01S3/07—Construction or shape of active medium consisting of a plurality of parts, e.g. segments
-
- 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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
- H01S3/08068—Holes; Stepped surface; Special cross-section
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
- H01S3/092—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Lasers (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は１円筒形の固体レーザ媒質を用いた固体レー
ザ発振器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid-state laser oscillator using a cylindrical solid-state laser medium.
従来の固体レーザ発振器は、第３図に示すように、両端
面を平行平面に研磨した円柱形の固体レーザ媒￥ｉ１と
、キセノン・ランプのような励起光源２とを楕円形の集
光用反射鏡３の２つの焦点位置にそれぞれ配８するとと
もに１円柱形の固体レーザ媒′ｆ１１の軸線上に全反射
鏡４と出力鏡５を配置したものである。As shown in Fig. 3, a conventional solid-state laser oscillator uses a cylindrical solid-state laser medium with both end faces polished to parallel planes, and an excitation light source 2 such as a xenon lamp in an elliptical shape for condensing light. A total reflection mirror 4 and an output mirror 5 are arranged at the two focal positions of the reflecting mirror 3, respectively, and on the axis of a cylindrical solid-state laser medium 'f11.
このような従来の固体レーザ発振器において。In such conventional solid state laser oscillators.
円柱形の固体レーザ媒質ｌは、励起光によって発熱し、
特に、中心部が高温度になり、屈折率が不均一になって
発光効率が低下し、また、熱応力を生じて破損するとい
う問題があって高出力化が困難であった。A cylindrical solid-state laser medium l generates heat due to excitation light,
In particular, it has been difficult to achieve high output because the temperature at the center becomes high, the refractive index becomes non-uniform, the luminous efficiency decreases, and thermal stress occurs, causing damage.
そこで、この発明は、このような固体レーザ発振器が有
する問題点を解決するために考えられたものであり、特
に、固体レーザ媒質を中空の円筒形に形成することによ
り熱応力を大幅に軽減しながら固体レーザ媒質の体積を
増加させて高出力化を実現したものである。Therefore, this invention was devised to solve the problems that such solid-state laser oscillators have.In particular, by forming the solid-state laser medium into a hollow cylindrical shape, thermal stress can be significantly reduced. However, high output was achieved by increasing the volume of the solid-state laser medium.
断面積および長さがほぼ等しく、材質が同じであるＮｄ
： ＹＡＧ結晶の円筒形固体レーザ媒質および円柱形
の固体レーザ媒質の中で発生する熱応力を対比して検討
すると、
（Ａ）外径が３０ｍｍ、内径が２０＋１長さが１５Ｃ１
１の円筒形Ｎｄ：ＹＡＧ結晶、
（Ｂ）外径が２２腸１．長さが１５ｃ層の円柱形Ｎｄ：
ＹＡＧ結晶、
について、
レーザ出力、ｌＫＷ
励起光源からの熱入力； ｌ ３０ Ｗ ／ ｃｍ”線
膨張係数、 ７ 、８Ｘ １０−６／’にり１性係数；
３Ｘ Ｉ Ｏ−３／ｃｍ２ポアソン比、０．２５
温度伝導率； ３ 、９ Ｘ １０−２ｃｍ２７ｓｅｃ
の条件のもとに、表面は水流で冷却されているものとし
て計算すると、各Ｎｄ：ＹＡＧ結晶の断面内で発生する
熱応力は、第２図（Ａ）、（Ｂ）で示すようになる。Nd with approximately the same cross-sectional area and length and the same material
: When comparing and examining the thermal stress generated in a cylindrical solid-state laser medium of YAG crystal and a cylindrical solid-state laser medium, (A) the outer diameter is 30 mm, the inner diameter is 20 + 1, and the length is 15C1.
1 cylindrical Nd:YAG crystal, (B) external diameter 22 mm 1. Cylindrical Nd with a length of 15c layers:
For YAG crystal, laser power, lKW heat input from excitation light source; l 30 W/cm" linear expansion coefficient, 7, 8X 10-6/' linearity coefficient;
3X IO-3/cm2 Poisson's ratio, 0.25 Temperature conductivity; 3, 9 X 10-2cm27sec
Under these conditions, the thermal stress generated within the cross section of each Nd:YAG crystal is calculated as shown in Figure 2 (A) and (B), assuming that the surface is cooled by a water flow. .
すなわち、円柱形のＮｄ：ＹＡＧ結晶では、半径方向の
熱応力σｒおよび円周方向の熱応力σＣが、いずれも中
心付近および外周部付近において一点鎖線で示す破壊限
界を越えるが１円筒形のＮｄ ： ＹＡＧ結晶では、半
径方向の熱応力σｒおよび円周方向の熱応力σＣが、い
ずれも一点鎖線で示す破壊限界の半分以下に収っている
。In other words, in a cylindrical Nd:YAG crystal, the thermal stress σr in the radial direction and the thermal stress σC in the circumferential direction both exceed the fracture limit shown by the dashed-dotted line near the center and near the outer periphery. : In the YAG crystal, the thermal stress σr in the radial direction and the thermal stress σC in the circumferential direction are both within half of the fracture limit shown by the dashed line.
この発明の固体レーザ発振器は、第１図に示すように、
円筒形の固体レーザ媒質を用いたものであって、固体レ
ーザ媒質１１の中空の部分に励起光源２を設け、固体レ
ーザ媒質１１の一方の軸線上に配置された円錐台形の内
反射面を有するコニカル・ミラー１２と、他方の軸線上
に配置された透光穴１４を有し、固体レーザ媒ｌＡｌ１
から放射される光線を直角方向に屈折する第１の平面鏡
１３と、この平面鏡１３で反射された光線を第１の平面
鏡１３の透光穴１４へ向けて反射させるダブル争アクシ
コン・ミラー１５と、この透光穴１４を通過した光線の
一部を出力光１０として直角方向に反射させ、他の一部
を凸面鏡１８へ導く透光穴１７を有する第２の平面鏡１
６からなる光学系を具備している。As shown in FIG. 1, the solid-state laser oscillator of this invention has the following features:
A cylindrical solid-state laser medium is used, the excitation light source 2 is provided in a hollow part of the solid-state laser medium 11, and the solid-state laser medium 11 has a truncated conical internal reflection surface arranged on one axis. It has a conical mirror 12 and a light-transmitting hole 14 arranged on the other axis, and has a solid-state laser medium lAl1.
a first plane mirror 13 that refracts the light rays emitted from the plane in a right angle direction; and a double axicon mirror 15 that reflects the light rays reflected by the plane mirror 13 toward the transparent hole 14 of the first plane mirror 13. A second plane mirror 1 having a light transmitting hole 17 that reflects a part of the light beam passing through the light transmitting hole 14 in the right angle direction as output light 10 and guiding the other part to the convex mirror 18.
It is equipped with an optical system consisting of 6 parts.
このダブル争アクシコン・ミラー１５は、円錐台形の内
反射面１５ａと円錐形の外反射面１５ｂとを備え、固体
レーザ媒質１１から放射さたリング状の光線８を棒状の
光線９に変換するものである。This double axicon mirror 15 is equipped with a truncated conical inner reflecting surface 15a and a conical outer reflecting surface 15b, and converts a ring-shaped light ray 8 emitted from the solid-state laser medium 11 into a rod-shaped light ray 9. It is.
そして、これらの光学系によって不安定共振器を構成し
ている。These optical systems constitute an unstable resonator.
円筒形の固体レーザ媒質を用いたレーザ発振器は、他の
円柱形の固体レーザ媒質を用いたレーザ発振器に比べて
共振器を構成する反射要素の調整が困難であり、わずか
でも不整合があると著しい出力の低減を生ずる。Laser oscillators that use a cylindrical solid-state laser medium are more difficult to adjust the reflective elements that make up the resonator than other laser oscillators that use cylindrical solid-state laser media, and even the slightest misalignment can cause problems. This results in a significant reduction in power output.
しかし、この発明の固体レーザ発振器においては、入射
光線と反射光線が常に平行であるコニカル・ミラー１２
およびダブル・アクシコン・ミラー１５を採用すること
により共振器の整合を容易なら１盾ス＋−１＋、１１ζ
嚇養ヱHowever, in the solid-state laser oscillator of the present invention, the conical mirror 12 in which the incident light beam and the reflected light beam are always parallel is used.
If it is easy to match the resonator by adopting a double axicon mirror 15, 1 shield + - 1 +, 11 ζ
Inquiry
第１図は、この発明の固体レーザ発振器の一実施例の概
略図、第２図は、円筒形の固体レーザ媒質および円柱形
の固体レーザ媒質の断面内で発生する熱応力を示す特性
曲線図、第３図は、従来の固体レーザ発振器の一例を示
す斜視図である。
２・・・励起光源
１１・・・円筒形の固体レーザ媒質
１２・・・コニカル・ミラー
１３・・・第１の平面鏡
１５・・・ダブル争アクシコン・ミラー１Ｂ・・・第２
の平面鏡
１８・・・凸面鏡
第３図
牙２図FIG. 1 is a schematic diagram of an embodiment of the solid-state laser oscillator of the present invention, and FIG. 2 is a characteristic curve diagram showing a cylindrical solid-state laser medium and thermal stress generated within the cross section of the cylindrical solid-state laser medium. , FIG. 3 is a perspective view showing an example of a conventional solid-state laser oscillator. 2... Excitation light source 11... Cylindrical solid laser medium 12... Conical mirror 13... First plane mirror 15... Double axicon mirror 1B... Second
Plane mirror 18... Convex mirror Fig. 3 Fang Fig. 2
Claims (1)
、 該固体レーザ媒質の他方の軸線上に配置された透光穴を
有する第１の平面鏡と、 該第１の平面鏡で反射された光線を中央部の光路に集め
て上記第１の平面鏡の透光穴へ向けて反射するダブル・
アクシコン・ミラーと、 上記第１の平面鏡の透光穴を通過した光線の一部を通過
させる透光穴１７を有し、他の光線を出力光として反射
させる第２の平面鏡と、 該第２の平面鏡の透光穴を通過した光線をダブル・アク
シコン・ミラーの方に反射させる凸面鏡と、 を具備することを特徴とする固体レーザ発振器。[Claims] A cylindrical solid-state laser medium, a reflecting mirror disposed on one axis of the solid-state laser medium, and a third light-transmitting hole disposed on the other axis of the solid-state laser medium. 1 plane mirror, and a double mirror that collects the light beam reflected by the first plane mirror into an optical path in the center and reflects it toward the transparent hole of the first plane mirror.
an axicon mirror; a second plane mirror having a light-transmitting hole 17 that allows a part of the light beam that has passed through the light-transmitting hole of the first plane mirror to pass through and reflects other light beams as output light; A solid-state laser oscillator comprising: a convex mirror that reflects a light beam passing through a transparent hole of a plane mirror toward a double axicon mirror;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28676086A JPH0738471B2 (en) | 1986-12-03 | 1986-12-03 | Solid-state laser oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28676086A JPH0738471B2 (en) | 1986-12-03 | 1986-12-03 | Solid-state laser oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63141382A true JPS63141382A (en) | 1988-06-13 |
| JPH0738471B2 JPH0738471B2 (en) | 1995-04-26 |
Family
ID=17708690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28676086A Expired - Lifetime JPH0738471B2 (en) | 1986-12-03 | 1986-12-03 | Solid-state laser oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0738471B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02288280A (en) * | 1989-04-27 | 1990-11-28 | Nec Corp | Transverse discharge excitation pulse gas laser device |
| JPH0362579A (en) * | 1989-03-28 | 1991-03-18 | Optomic Technol Corp Ltd | Laser system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010021486A (en) * | 2008-07-14 | 2010-01-28 | Shibuya Kogyo Co Ltd | Laser oscillator |
-
1986
- 1986-12-03 JP JP28676086A patent/JPH0738471B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0362579A (en) * | 1989-03-28 | 1991-03-18 | Optomic Technol Corp Ltd | Laser system |
| JP2786508B2 (en) * | 1989-03-28 | 1998-08-13 | オプトミック テクノロジーズ コーポレイション リミティド | Laser system |
| JPH02288280A (en) * | 1989-04-27 | 1990-11-28 | Nec Corp | Transverse discharge excitation pulse gas laser device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0738471B2 (en) | 1995-04-26 |
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