JPS59151482A - Laser oscillator for q switch - Google Patents

Laser oscillator for q switch

Info

Publication number
JPS59151482A
JPS59151482A JP58025883A JP2588383A JPS59151482A JP S59151482 A JPS59151482 A JP S59151482A JP 58025883 A JP58025883 A JP 58025883A JP 2588383 A JP2588383 A JP 2588383A JP S59151482 A JPS59151482 A JP S59151482A
Authority
JP
Japan
Prior art keywords
switch
energy
pulse
laser
approximately
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
JP58025883A
Other languages
Japanese (ja)
Other versions
JPS6232635B2 (en
Inventor
Toshihisa Tomie
敏尚 富江
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.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
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 Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP58025883A priority Critical patent/JPS59151482A/en
Publication of JPS59151482A publication Critical patent/JPS59151482A/en
Publication of JPS6232635B2 publication Critical patent/JPS6232635B2/ja
Granted legal-status Critical Current

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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1106—Mode locking
    • H01S3/1109—Active mode locking
    • 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
    • H01S3/08018—Mode suppression
    • H01S3/08022—Longitudinal modes
    • H01S3/08031—Single-mode emission
    • H01S3/08036—Single-mode emission using intracavity dispersive, polarising or birefringent elements
    • 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
    • H01S3/08018—Mode suppression
    • H01S3/0804—Transverse or lateral modes
    • H01S3/0805—Transverse or lateral modes by apertures, e.g. pin-holes or knife-edges
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/1068—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using an acousto-optical device
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1123—Q-switching
    • H01S3/115—Q-switching using intracavity electro-optic devices

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

PURPOSE:To obtain a high quality and highly stable output of high synchronism by pulse-exciting energy, which is sufficiently larger than the oscillation threshold energy of a laser oscillator and executes false stationary oscillation. CONSTITUTION:A YAG rod 4 is excited by a flash lamp by a resonator constituted by reflecting mirrors 1, 8 and laser-oscillated. A lateral mode and a longitudinal mode are controlled by a pin hole 5 and an etalon 6. An acoustic optical element 7 for synchronizing the modes is arranged in order to obtain extremely short pulses. A Pockels-cell 2 and a polarizer 3 are used for a Q switch. Threshold energy is approximately seven joule, but pulse excitation in approximately sixteen joule is executed. A giant laser pulse row appears after approximately 200+1sec after the operation of the Q switch. The laser pulse row acquired is very excellent, and the stability of energy is also + or -1% or less. A jitter is every small.

Description

【発明の詳細な説明】 この発明は、巨大レーザパルスを発生するＱスイッチＶ
−ザ発振器に関するものである。DETAILED DESCRIPTION OF THE INVENTION This invention provides a Q-switch V that generates a gigantic laser pulse.
- This relates to the oscillator.

Ｑスイッチレーザ発振器からは巨大レーザパルスが得ら
れるが、そのＶ−ザパルスのモードおよび出現時刻等は
不安定である。これを安定にするため従来状の方法がと
られてきた。Although a huge laser pulse can be obtained from a Q-switched laser oscillator, the mode and appearance time of the V-za pulse are unstable. Conventional methods have been used to stabilize this.

その第１は、しきい値エネルギーよりわずかに大きなエ
ネルギーで励起を行い、緩和発振によるスパイクパルス
を観測し、その時Ｑスイッチ動作させる方法である。こ
、れによれば比較的モードおよび強度が安定したＶ−ザ
バルスが得られる。しかしスパイクパルスの出現時刻が
ジッターが大きく、そのためジッターの少ない巨大レー
ザパルスを得る用途には適さず、レーザパルスの制御度
も不十分なことが多い。The first method is to perform excitation with energy slightly higher than the threshold energy, observe spike pulses due to relaxation oscillation, and operate the Q switch at that time. According to this method, a V-zabalus whose mode and intensity are relatively stable can be obtained. However, the appearance time of the spike pulse has a large jitter, so it is not suitable for obtaining a huge laser pulse with little jitter, and the degree of control of the laser pulse is often insufficient.

第２の方法眸、Ｑスイッチ素子等の光学的損失を一定に
保ち、励起パワーもわずかに！振が持続すや程度、以上
のパワーで一定に制御し、準定常発振状態をしばらく持
続さすた後Ｑスイッチ動作させるものである。この方法
は理想に近いものであるが、実用上は励起パワーおよび
共振器等を極めて高精度に制御す企ことが要求されるの
で問題が多い。The second method keeps the optical loss of the Q-switch element constant, and the excitation power is also small! The Q-switch is operated after the quasi-steady oscillation state is maintained for a while by controlling the oscillation to a constant level at a power higher than the oscillation level. Although this method is close to ideal, it has many problems in practice because it requires very precise control of the excitation power, resonator, etc.

この発明は、上記従来技術の第２の方法と同程度の精度
に制御された巨大レーザパルスを、第１の方法以上に実
用上簡便に得ることを目的とじて九）る。以下この発明
について説明する。The present invention aims to obtain a gigantic laser pulse controlled to the same level of accuracy as the second method of the prior art, but more conveniently than the first method. This invention will be explained below.

まずこの発明の原理を述べる。　　　　　　、　。First, the principle of this invention will be described.　　　　　　　,　.

Ｑスイッチ動作をさせないノルマル発振において、シ着
い値以上のエネルギーでパルス励起を行うと緩和発振と
呼ばれるスパイク、パルスが幾つか現われる。励起およ
び共振器等の不安定性により緩和発振の様相は不安定で
ある。In normal oscillation without Q-switch operation, when pulse excitation is performed with energy above the threshold value, several spikes and pulses called relaxation oscillation appear. The mode of relaxation oscillation is unstable due to instability of excitation, resonator, etc.

しかし本発明者は、励起エネルギーをスパイクパルスが
５本以上現われるように極めて大きくすることＫより、
疑似的に定常発振する状態が実現可能であることを見出
し、実験的に確認した。この状態では、共振器内電場は
共振器内の種々の制御素子により十分制御されており、
Ｑスイッチ動作をさせると、極めて安定で良質なジッタ
ーが少ない巨大Ｖ−ザバルスを得ゐことかできる。However, the present inventor proposed that by increasing the excitation energy extremely high so that five or more spike pulses appear,
We found that it is possible to create a state of pseudo-steady oscillation, and confirmed it experimentally. In this state, the electric field inside the resonator is well controlled by various control elements inside the resonator.
By using Q-switch operation, it is possible to obtain an extremely stable and high-quality giant V-zabalus with little jitter.

次にこの発明の実施例について説明する。Next, embodiments of this invention will be described.

第１図はこの発明の一実施例を示す構成略図である。こ
の図で、１．８は反射鏡であり、両者で構成される共振
器によって、ＹＡＧρツド４をフラッシュランプで励起
してレーザ発振をさせる。FIG. 1 is a schematic diagram showing an embodiment of the present invention. In this figure, reference numeral 1.8 denotes a reflecting mirror, and a resonator composed of both excites the YAG ρ rod 4 with a flash lamp to cause laser oscillation.

ピンホール５とエタロン６によって、横および縦のモー
ドを制御する。非常に短かいパルスを得るためモニド゛
同期用の音響光学素子７も配置する。The pinhole 5 and etalon 6 control the transverse and longitudinal modes. In order to obtain very short pulses, an acousto-optic element 7 for monochromatic synchronization is also arranged.

Ｑスイッチ用にボッ゛ケルス・セル２と偏光子３を使用
する。しきい値エネルギーは約７ジユールであるが、　
約１６ジユールのパルス励起を行う。Ｑスイッチ動作後
約２００ナノ秒後に巨大レーザパルス列が出現する。A Bockels cell 2 and a polarizer 3 are used for the Q-switch. The threshold energy is about 7 joules,
A pulse excitation of approximately 16 Joules is performed. A giant laser pulse train appears about 200 nanoseconds after the Q-switch operation.

第２図はＱスイッチ動作とパルス列の時間的関係を示す
もので、シンクロスコープの波形写真を模写したもので
ある。FIG. 2 shows the temporal relationship between the Q-switch operation and the pulse train, and is a reproduction of a waveform photograph taken with a synchroscope.

第２図で、左側の急激に立ち下が″つているのがＱスイ
ッチ動作を示す電気信号であり、中央のパルス列が得ら
れたレーザパルスである。パルス列のピークはＱスイッ
チ動作後約２００ナノ秒後に現われている。得られたレ
ーザパルス列は極めて良質でエネルギー安定度も±１パ
ーセント以下である。しかもジッターは±１０ナノ秒以
下と極めて小さい。In Figure 2, the sharply falling edge on the left is the electrical signal that indicates the Q-switch operation, and the pulse train in the center is the obtained laser pulse.The peak of the pulse train is about 200 nanometers after the Q-switch action. The laser pulse train appears after a few seconds.The resulting laser pulse train has extremely high quality and energy stability of less than ±1 percent.Moreover, the jitter is extremely small, less than ±10 nanoseconds.

Ｑスイッチ素子の光学的損失がパルス励起開始後体々に
増加するようＫすればより早く疑似定常発振状態が実現
され、より低エネルギーでＱスイッチＶ−ザ発振が実現
されるす 上述した実施例では発振開始の電気信号を発生させてか
ら３５０マイクロ秒後に、推是約１００ピコ秒の正確さ
で約１パーセントのエネルギー安定度の巨大レーザパル
スが得られた。原理的には、正確な時計さえあれば無限
に長い゛将来Ｋ１００ピコ秒の時間精度でレーザパルス
を゛発生させられる。If the optical loss of the Q-switch element increases gradually after the start of pulse excitation, a quasi-steady oscillation state can be realized more quickly, and Q-switch V-the oscillation can be realized with lower energy. Now, 350 microseconds after generating the electrical signal to start oscillation, a gigantic laser pulse with an energy stability of about 1 percent was obtained with an accuracy of approximately 100 picoseconds. In principle, as long as you have an accurate clock, you can generate laser pulses with a time precision of K100 picoseconds for an infinitely long time in the future.

また何かの現象後約２００ナノ秒後にジッターなくレー
ザパルスを得ることができる。このように極めて同期性
の高い高安定パルスは、従来のＱスイッチＶ−ザの応用
範囲を大き□く広げるものである。Furthermore, a laser pulse can be obtained without jitter approximately 200 nanoseconds after some phenomenon occurs. Such highly synchronized and highly stable pulses greatly expand the range of applications of conventional Q-switched V-zas.

以上説明したように、この発明は、単に強パルス励起を
行うという極めて簡便な方法で、同期性の極め【高い高
品質で、かつ高安定のＶ−ザパルスを得ることができる
利点があ木。As explained above, the present invention has the advantage of being able to obtain a V-the-pulse with extremely high synchronicity (high quality and high stability) by simply performing strong pulse excitation, which is an extremely simple method.

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

第１図はこの発明の一実施例の構成を示す模式図、第２
図はＱスイッチと出現レーザパルス列の時間的関係を示
す図である。 図中、１．８は反射鏡、２はポッケルス・セル、３は俳
尭子、４はＹＡＧ−ラド、５はピンホール、６はエタロ
ン、７は音響光学素子である。FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a diagram showing the temporal relationship between the Q-switch and the appearing laser pulse train. In the figure, 1.8 is a reflecting mirror, 2 is a Pockels cell, 3 is a filter, 4 is a YAG-rad, 5 is a pinhole, 6 is an etalon, and 7 is an acousto-optic element.

Claims (2)

【特許請求の範囲】[Claims] （１）共振缶内ＫＱスイッチ、素子を配置したレーザ発
振器において、前記レーザ発振器の発振しきい値エネル
ギーより十分大き、く擬似的な定常発振を行わせるエネ
ルギーのパルス励起を行う手段を具備せしめたことを特
徴とするＱスイッチＶ−ザ発振器。(1) A laser oscillator in which a resonant in-can KQ switch and an element are arranged is provided with a means for exciting a pulse of energy that is sufficiently larger than the oscillation threshold energy of the laser oscillator and causes pseudo steady oscillation. A Q-switched V-the oscillator characterized by: （２）Ｑスイッチ素子は、パルス励起開始後徐々に光学
的損失を増大させるものである特許請求の範囲第（１）
項記載のＱスイッチレーザ発振器。(2) The Q-switch element gradually increases optical loss after the start of pulse excitation. Claim (1)
Q-switched laser oscillator described in section.
JP58025883A 1983-02-18 1983-02-18 Laser oscillator for q switch Granted JPS59151482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58025883A JPS59151482A (en) 1983-02-18 1983-02-18 Laser oscillator for q switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58025883A JPS59151482A (en) 1983-02-18 1983-02-18 Laser oscillator for q switch

Publications (2)

Publication Number Publication Date
JPS59151482A true JPS59151482A (en) 1984-08-29
JPS6232635B2 JPS6232635B2 (en) 1987-07-15

Family

ID=12178175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58025883A Granted JPS59151482A (en) 1983-02-18 1983-02-18 Laser oscillator for q switch

Country Status (1)

Country Link
JP (1) JPS59151482A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62189783A (en) * 1985-12-19 1987-08-19 スペクトラ−フイジツクス・インコ−ポレイテツド Laser diode pumping solid state laser
EP0515083A1 (en) * 1991-05-13 1992-11-25 Litton Systems, Inc. Single frequency laser system emitting pulses followed by a long tail
WO1999060677A1 (en) * 1998-05-15 1999-11-25 United States Of America As Represented By The Administrator Of The National Aeronotics And Space Administration Fiber grating coupled light source capable of tunable, single frequency operation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62189783A (en) * 1985-12-19 1987-08-19 スペクトラ−フイジツクス・インコ−ポレイテツド Laser diode pumping solid state laser
EP0515083A1 (en) * 1991-05-13 1992-11-25 Litton Systems, Inc. Single frequency laser system emitting pulses followed by a long tail
US6188705B1 (en) 1997-05-16 2001-02-13 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Fiber grating coupled light source capable of tunable, single frequency operation
WO1999060677A1 (en) * 1998-05-15 1999-11-25 United States Of America As Represented By The Administrator Of The National Aeronotics And Space Administration Fiber grating coupled light source capable of tunable, single frequency operation

Also Published As

Publication number Publication date
JPS6232635B2 (en) 1987-07-15

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