JPH0246987A - Device for monitoring energy of laser light - Google Patents

Device for monitoring energy of laser light

Info

Publication number
JPH0246987A
JPH0246987A JP63194603A JP19460388A JPH0246987A JP H0246987 A JPH0246987 A JP H0246987A JP 63194603 A JP63194603 A JP 63194603A JP 19460388 A JP19460388 A JP 19460388A JP H0246987 A JPH0246987 A JP H0246987A
Authority
JP
Japan
Prior art keywords
laser
detector
reflected
energy
beam splitter
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
Application number
JP63194603A
Other languages
Japanese (ja)
Other versions
JPH0616952B2 (en
Inventor
Keiji Okino
沖野 圭司
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP63194603A priority Critical patent/JPH0616952B2/en
Publication of JPH0246987A publication Critical patent/JPH0246987A/en
Publication of JPH0616952B2 publication Critical patent/JPH0616952B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Laser Beam Processing (AREA)

Abstract

PURPOSE:To measure the laser output during processing even if the reflectivity from a work changes by partly reflecting the output from laser light and the reflected light of the laser light from the work by a beam splitter and measuring the same by using two pieces of detectors. CONSTITUTION:The laser light oscillated from a laser device 1 is reflected by the beam splitter 2 having the reflectivity r0. The energy of r0I0 enters the 1st detector 3 if the original laser output is designated as I0 and the laser light transmitted through the beam splitter 2 is (1-r0)I0. The laser light transmitted therethrough is reflected by the work 4 having the reflectivity R and the energy of R(1-r0)I0 is reflected and is reflected by the beam splitter 2. The energy of r0R(1-r0)I0 enters the 2nd detector for monitoring the reflected light from the work. The measured value I4 of the 2nd detector 5 is computed by an arithmetic unit 6 from the measured value I3 of the 1st detector 3, by which the value of R(1-r0) is obtd. Since the value of r0 is known by the reflectivity of the beam splitter 2, the reflectivity R of the work 4 can be determined.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、レーザ装置の出力を測定する技術に関し、特
にレーザ加工分野でレーザ加工物に与えられるレーザ光
を測定する技術に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a technique for measuring the output of a laser device, and more particularly to a technique for measuring laser light applied to a laser workpiece in the field of laser processing.

〔従来の技術〕[Conventional technology]

従来、この種のレーザ光エネルギーを管理する方法は、
事前にレーザ装置の入出力特性(入力エネルギーと出力
エネルギー特性)を測定し、このデータを元に加工物に
与えられるエネルギー値を管理したり、あるいは第3図
においてレーザ装置13の全反射ミラー14から透過す
る約0.5%はどのレーザ光を第5の検知器15により
モニタすることによシレーザエネルギーの管理をおこな
っている。また、第4図においてレーザ装置16の出射
ミラー17の外側にビームスプリッタ18を置き、レー
ザ光の一部をビームスプリッタ18により反射し第6の
検゛知器19によシ測定していた。
Traditionally, the method of managing this kind of laser light energy is
The input/output characteristics (input energy and output energy characteristics) of the laser device are measured in advance, and the energy value given to the workpiece is managed based on this data, or the total reflection mirror 14 of the laser device 13 in FIG. Laser energy is managed by monitoring which laser light is about 0.5% transmitted by the fifth detector 15. Further, in FIG. 4, a beam splitter 18 is placed outside the output mirror 17 of the laser device 16, and a portion of the laser beam is reflected by the beam splitter 18 and measured by a sixth detector 19.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来のレーザ光のエネルギー管理方法は、以下
の欠点を有する。すなわち、レーザ装置の入出力特性を
測定しそのデータを元に管理する方法においては、レー
ザ装置の条件であるガス圧励起ランプ状態、光学部品の
清浄度、アライメントなどが経時的に変化するため定期
的な測定が必要であり、また急激な状態変化を知る方法
とはなりえない。
The conventional laser beam energy management method described above has the following drawbacks. In other words, in the method of measuring the input/output characteristics of a laser device and managing it based on that data, the laser device conditions such as gas pressure excitation lamp state, cleanliness of optical parts, alignment, etc. change over time, so It requires detailed measurements, and cannot be used as a method to detect sudden changes in state.

全反射ミラーの透過光あるいは出射側ミラーの外側にビ
ームスプリッタを置く方法では、第4図に示すように、
加工物からの反射光がないときの測定値と加工物からの
反射光があるときの測定値により差が生じる。これは、
加工物からの反射光がない場合、検出器により測定され
る値は2元のレーザ出力をI0ビームスプリッタ−の反
射率をroあるいは全反射ミラーの透過率をt。とする
と。
In the method of placing a beam splitter outside the transmitted light of the total reflection mirror or the output side mirror, as shown in Fig. 4,
A difference occurs between the measured value when there is no reflected light from the workpiece and the measured value when there is reflected light from the workpiece. this is,
In the absence of reflected light from the workpiece, the values measured by the detector are the binary laser output, I0, the reflectance of the beam splitter, ro, or the transmittance of the total internal reflection mirror, t. If so.

各々r0I。とt。Ioであるが、加工物でレーザ光が
反射しレーザ装置にもどってくると、このレーザ光は出
射側ミラーで再び反射されビームスプリッタ18により
検出器に入射するので、実際のレーザ出力よシも高い値
を示す。また、加工物で反射したレーザ光はレーザ装置
の出射側ミラーを一部透過しさらに全反射ミラーを一部
透過し検出器に入射し、実際のレーザ出力よりも高い値
を示す。
Each r0I. and t. However, when the laser beam is reflected by the workpiece and returns to the laser device, this laser beam is reflected again by the output side mirror and enters the detector by the beam splitter 18, so the actual laser output may be different. Indicates a high value. Further, the laser beam reflected by the workpiece partially passes through the output side mirror of the laser device, further passes partially through the total reflection mirror, and enters the detector, showing a value higher than the actual laser output.

このだめ、従来のレーザ光のエネルギー管理方法は、加
工中の実際のレーザ出力を正確に測定できないという欠
点がある。
However, conventional laser beam energy management methods have the disadvantage that the actual laser output during processing cannot be accurately measured.

本発明は上記の欠点を補うため、加工物から反射される
光を測定する手段を新らたに設け、更に従来レーザ光と
して測定していた値(実際は加工物からの反射光を含ん
でいる)から加工物からの分を差引く演、算装置を設け
たものである。
In order to compensate for the above-mentioned drawbacks, the present invention provides a new means for measuring the light reflected from the workpiece, and further improves the value that was conventionally measured as laser light (actually includes the reflected light from the workpiece). ) is equipped with an arithmetic device that subtracts the amount from the workpiece.

〔課題を解決するための手段〕[Means to solve the problem]

本発明によれば、レーザ発振器から発するレーザ光のエ
ネルギーを、出射ミラーと加工物の間に設けたビームス
プリフタで該レーザ光の一部を取り出し第1の検知器で
検知することによりモニタするモニタ装置において、前
記ビームスプリッタの前記第1の検出器とは反対側に第
2の検出器を設け、且つ、前記第1及び第2の検出器の
出力から前記加工物からの反射率が変化しても前記レー
ザ光出力の値を正しく演算する演算装置を設けて成る事
を特徴とするレーザ光エネルギーモニタ装置が得られる
According to the present invention, the energy of the laser beam emitted from the laser oscillator is monitored by extracting a part of the laser beam with a beam splitter provided between the output mirror and the workpiece and detecting it with the first detector. In the monitoring device, a second detector is provided on a side opposite to the first detector of the beam splitter, and the reflectance from the workpiece changes based on the outputs of the first and second detectors. Even in this case, a laser light energy monitoring device is obtained, which is characterized in that it is provided with an arithmetic device that correctly calculates the value of the laser light output.

〔実施例〕〔Example〕

次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第1図は本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.

レーザ装置1よシ発振したレーザ光は反射率r。を有す
るビームスプリッタ2により反射される。このとき第1
の検出器3には元のレーザ出力をI。とするとroI。
The laser beam oscillated by the laser device 1 has a reflectance r. The beam is reflected by the beam splitter 2 having a . At this time, the first
Detector 3 receives the original laser output I. Then roI.

のエネルギーが入射し、ビームスプリッタ2を透過する
レーザ光は(1−ro)Ioである。
The energy of the laser beam incident and transmitted through the beam splitter 2 is (1-ro)Io.

ビームスプリッタ2を透過したレーザ光は加工物4で反
射されるが、このときの反射率をRとすると、R(1−
ro)I。のエネルギーが反射し、ビームスグリツタ2
で反射して加工物からの反射光モニタ用の第2の検出器
5にr。R(1−ro) Ioのエネルギーが入射する
。このビームスプリッタ2を透過したエネルギーR(1
−ro)2I0のレーザ光はレーザ装置1に入射するが
、レーザ装置1からのレーザ光の反射率をrLとすると
、レーザ装置1から再びrLR(1ro)2工。のエネ
ルギーが加工物4方向にもどってくることになる。
The laser beam transmitted through the beam splitter 2 is reflected by the workpiece 4. If the reflectance at this time is R, then R(1-
ro)I. The energy of is reflected and Beam Sgrit 2
r to a second detector 5 for monitoring reflected light from the workpiece. Energy of R(1-ro) Io is incident. Energy R(1
-ro)2I0 laser light enters the laser device 1, but if the reflectance of the laser light from the laser device 1 is rL, then from the laser device 1 it returns to rLR(1ro)2. The energy will be returned in the four directions of the workpiece.

これらを総合すると、第1の検出器3には、a=r L
 R(l  r 0) 2とおくと、 (1+a+a2
+a3+a’+a”+−・−・・・+a″1)roI。
Putting these together, the first detector 3 has a=r L
If we set R(l r 0) 2, (1+a+a2
+a3+a'+a''+-・-...+a''1) roI.

のレーザ光エネルギーが入射し、第2の検出器5には(
1+a+a2+a’+ −−−+ aoO) roR(
1−ro)IOのレーザ光エネルギーが入射することに
なる。aは1より小さい数字であり+(1+a+a2+
・・・・・・aoo)はある一定値に収束する。
laser light energy is incident on the second detector 5 (
1+a+a2+a'+ ---+ aoO) roR(
1-ro) IO laser light energy will be incident. a is a number smaller than 1 and +(1+a+a2+
...aoo) converges to a certain constant value.

第1の検出器3により測定された値をI3.第2の検出
器5に−より測定された値をI4とし、演算装置6によ
り工4値をI5で割るとR(1−ro)の値が得られる
。roの値はビームスプリッタ2の反射率で一定値のあ
らかじめから分っている値であり、これより加工物4の
反射率Rの値を演算により求めることができる。そして
加工物40反射率を求めることによf) 、 a= r
LR(1−ro)2の値を求め。
The value measured by the first detector 3 is I3. Let the value measured by the second detector 5 be I4, and divide the value by I5 using the arithmetic unit 6 to obtain the value R(1-ro). The value of ro is the reflectance of the beam splitter 2 and is a constant value known in advance, and from this value the value of the reflectance R of the workpiece 4 can be calculated. Then, by calculating the reflectance of the workpiece 40, f), a= r
Find the value of LR(1-ro)2.

(1+ a + a2+ a5+ ・・・・・−+ a
″1)roの値を計算することにより、レーザ光の元の
出力I。を求めることができる。
(1+ a + a2+ a5+ ・・・・・・-+ a
1) By calculating the value of ro, the original output I of the laser beam can be obtained.

第2図は本発明の実施例2のブロック図である。FIG. 2 is a block diagram of a second embodiment of the present invention.

レーザ装置7から発振するレーザ光は未知の反射率rx
を有するビームスプリッタ8によりレーザ光を分割する
。一方のレーザ光エネルギーは第3の検出器9によシモ
ニタし、他方は既知の反射率R0を持つ物質10に垂直
入射し2表面で反射し逆にもどってくる。反射したレー
ザ光は未知の反射率rXを有するビームスグリツタ8に
よシ反射し、第4の検出器11に入射する。
The laser beam oscillated from the laser device 7 has an unknown reflectance rx
The laser beam is split by a beam splitter 8 having a One laser beam energy is monitored by a third detector 9, and the other laser beam energy is perpendicularly incident on a substance 10 having a known reflectance R0, reflected by two surfaces, and returned in the opposite direction. The reflected laser light is reflected by the beam sinter 8 having an unknown reflectance rX, and enters the fourth detector 11.

実施例1で述べたように、第3の検出器9には。As described in Example 1, in the third detector 9.

b=rLRo(1−rx)2とおくと、  (1+b+
b2+b5+−+boO)rxI。
If we set b=rLRo(1-rx)2, (1+b+
b2+b5+-+boO)rxI.

のレーザ光のエネルギーが入射し、第4の検出器11に
は(1+b+b2+b5+・・・+b″’)rxRo(
1−rx)I。のレーザ光エネルギーが入射することに
なる。bは1よシ小さい値であり(1+b+b2+・・
・+b″)はある値に収束する。第3の検出器9により
測定された値を15.第4の検出器11により測定され
た値を16とし、演算装置12によりI5の値を16で
割るとRo(1−rρの値が得られる。Roの値は既知
であるから、rxを計算により求めることが可能である
The energy of the laser beam is incident on the fourth detector 11, and (1+b+b2+b5+...+b'')rxRo(
1-rx)I. of laser light energy will be incident. b is a smaller value than 1 (1+b+b2+...
・+b'') converges to a certain value.The value measured by the third detector 9 is set to 15.The value measured by the fourth detector 11 is set to 16.The value of I5 is set to 16 by the arithmetic unit 12. By dividing, the value Ro(1-rρ) is obtained. Since the value of Ro is known, it is possible to obtain rx by calculation.

〔発明の効果〕〔Effect of the invention〕

以上説明したように5本発明はレーザ光からの出力と加
工物からのレーザ光の反射光をビームスプリッターによ
り一部反射し、2個の検出器を用いて測定することによ
り、加工物からの反射率が変化しても加工中のレーザ出
力を正確に測定することができる。このためレーザ加工
中のレーザ出力を正確に管理することが出来、レーザ加
工の品質を向上させる効果がある。
As explained above, the present invention partially reflects the output from the laser beam and the reflected light of the laser beam from the workpiece using a beam splitter, and measures the output using two detectors. Even if the reflectance changes, the laser output during processing can be accurately measured. Therefore, the laser output during laser processing can be accurately controlled, which has the effect of improving the quality of laser processing.

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

第1図はレーザ光エネルギーモニタ装置のブロック図、
第2図はビームスグリツタの反射率rxを測定する装置
のブロック図、第3図は従来のレーザ光エネルギーモニ
タ装置の一例のブロック図。 第4図は従来のレーザ光エネルギーモニタ装置の他の例
のブロック図である。 記号の説明:1・・・レーザ装置+1a・・・出射ミラ
、2・・・ビームスプリッタ、3・・・第1の検出器。 4・・・加工物、5・・・第2の検出器、6・・・演算
装置。 7・・・レーザ装置、8・・・ビームスプリッタ、9・
・・第3の検出器、10・・・物質、11・・・第4の
検出器。 12・・・演算装置。
Figure 1 is a block diagram of the laser light energy monitoring device.
FIG. 2 is a block diagram of a device for measuring the reflectance rx of a beam sinter, and FIG. 3 is a block diagram of an example of a conventional laser beam energy monitoring device. FIG. 4 is a block diagram of another example of a conventional laser beam energy monitoring device. Explanation of symbols: 1...Laser device +1a...Emission mirror, 2...Beam splitter, 3...First detector. 4... Workpiece, 5... Second detector, 6... Arithmetic device. 7...Laser device, 8...Beam splitter, 9.
...Third detector, 10...Substance, 11...Fourth detector. 12... Arithmetic device.

Claims (1)

【特許請求の範囲】[Claims] (1)レーザ発振器から発するレーザ光のエネルギーを
、出射ミラーと加工物の間に設けたビームスプリッタで
該レーザ光の一部を取り出し第1の検知器で検知するこ
とによりモニタするモニタ装置において、 前記ビームスプリッタの前記第1の検出器とは反対側に
第2の検出器を設け、且つ、前記第1及び第2の検出器
の出力から前記加工物からの反射率が変化しても前記レ
ーザ光出力の値を正しく演算する演算装置を設けて成る
事を特徴とするレーザ光エネルギーモニタ装置。
(1) A monitoring device that monitors the energy of a laser beam emitted from a laser oscillator by extracting a part of the laser beam with a beam splitter provided between an output mirror and a workpiece and detecting it with a first detector, A second detector is provided on the opposite side of the beam splitter from the first detector, and even if the reflectance from the workpiece changes from the outputs of the first and second detectors, the 1. A laser light energy monitoring device comprising a calculation device that correctly calculates the value of laser light output.
JP63194603A 1988-08-05 1988-08-05 Laser light energy management method Expired - Fee Related JPH0616952B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63194603A JPH0616952B2 (en) 1988-08-05 1988-08-05 Laser light energy management method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63194603A JPH0616952B2 (en) 1988-08-05 1988-08-05 Laser light energy management method

Publications (2)

Publication Number Publication Date
JPH0246987A true JPH0246987A (en) 1990-02-16
JPH0616952B2 JPH0616952B2 (en) 1994-03-09

Family

ID=16327295

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63194603A Expired - Fee Related JPH0616952B2 (en) 1988-08-05 1988-08-05 Laser light energy management method

Country Status (1)

Country Link
JP (1) JPH0616952B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03120427A (en) * 1989-10-03 1991-05-22 Mitsubishi Heavy Ind Ltd Monitoring laser oscillation output
JP2017521264A (en) * 2014-06-12 2017-08-03 スキャンラボ ゲーエムベーハー オプティッシェ テクノロジエン Laser processing apparatus with parallel offset part

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5916691A (en) * 1982-07-21 1984-01-27 Hitachi Ltd Laser working device
JPS62104089A (en) * 1985-10-30 1987-05-14 Nippei Toyama Corp Laser output controller
JPS6363589A (en) * 1986-09-02 1988-03-19 Komatsu Ltd Laser beam machining method for high reflection factor material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5916691A (en) * 1982-07-21 1984-01-27 Hitachi Ltd Laser working device
JPS62104089A (en) * 1985-10-30 1987-05-14 Nippei Toyama Corp Laser output controller
JPS6363589A (en) * 1986-09-02 1988-03-19 Komatsu Ltd Laser beam machining method for high reflection factor material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03120427A (en) * 1989-10-03 1991-05-22 Mitsubishi Heavy Ind Ltd Monitoring laser oscillation output
JP2017521264A (en) * 2014-06-12 2017-08-03 スキャンラボ ゲーエムベーハー オプティッシェ テクノロジエン Laser processing apparatus with parallel offset part
US10272521B2 (en) 2014-06-12 2019-04-30 Scanlab Gmbh Laser machining apparatus comprising a parallel displacement unit

Also Published As

Publication number Publication date
JPH0616952B2 (en) 1994-03-09

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