JPH01128484A - High-efficiency second harmonic generating laser oscillator - Google Patents

High-efficiency second harmonic generating laser oscillator

Info

Publication number
JPH01128484A
JPH01128484A JP28588487A JP28588487A JPH01128484A JP H01128484 A JPH01128484 A JP H01128484A JP 28588487 A JP28588487 A JP 28588487A JP 28588487 A JP28588487 A JP 28588487A JP H01128484 A JPH01128484 A JP H01128484A
Authority
JP
Japan
Prior art keywords
optical crystal
laser beam
laser
linear optical
nonlinear optical
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
JP28588487A
Other languages
Japanese (ja)
Inventor
Hirotoshi Soma
相馬　弘年
Isamu Shindo
勇 進藤
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.)
ASUKARU KK
Original Assignee
ASUKARU KK
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 ASUKARU KK filed Critical ASUKARU KK
Priority to JP28588487A priority Critical patent/JPH01128484A/en
Publication of JPH01128484A publication Critical patent/JPH01128484A/en
Pending legal-status Critical Current

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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
    • H01S3/106—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
    • H01S3/108—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 non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation

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

Abstract

PURPOSE:To enable a high conversion efficiency and an improved laser beam to be obtained by providing an angular phase conformity type non-linear optical crystal as the second harmonic generating element and by providing an adjusting system of the diameter of laser beam and the length of non-linear optical crystal. CONSTITUTION:By allowing a laser beam generated from an oscillator to incide the second harmonic generating element formed from a non-linear optical crystal body, a laser beam wavelength is converted. In this case, an angular phase conformity type crystal is used as a non-linear optical crystal body. A crystal such as KTiOPO4 and beta-BaB2O4 can be used. By using a non-linear optical crystal body of angular phase conformity type to adjust the length of laser beam diameter and that of this crystal body, the second higher harmonic of higher efficiency can be generated. A laser oscillator has for example a laser oscillating element 1, an output mirror 2, and a plain all-reflection mirror 3 and a collimater lens for collecting light 4 and the second higher harmonic generating element 5 using a non-linear optical crystal are provided between this output mirror 2 and the plane total-reflection mirror 3.

Description

【発明の詳細な説明】 （技術分野） この発明は、高効率第二高調波発生レーザ発振器に関す
るものである。さらに詳しくは、この発明は、基本レー
ザ光を効率良く第二高調波に変換し、半分の波長を有す
るレーザ光を発振させる装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a highly efficient second harmonic generation laser oscillator. More specifically, the present invention relates to a device that efficiently converts a fundamental laser beam into a second harmonic and oscillates a laser beam having half the wavelength.

（背景技術） 近年、レーザ光の各種分野への応用は、ますよす盛んに
なっており、この応用の拡大にともなりて、レーザ光の
波長を変換しようとする試みが活発になされている。た
とえば、代表的な固体レーザ発振装置であるＹＡＧレー
ザ装置の場合にも、加工用として使用する場合には、波
長が短い程、加工精度が上がるため、第二高調波発生素
子を使用して、その波長を半分にして使用する場合が多
くなっている。このＹＡＧレーザ光の波長の変換に用い
る第二高調波発生素子としては、Ｌｉ　　Ｉ　Ｏ、ＫＴ
ｉ　ＯＰ　Ｏ，ｉ　　（ＫＴＰ　）等が知られており、
すでにこれらの素子を使用した装置も市販されている。(Background Art) In recent years, the application of laser light to various fields has become more and more popular, and with the expansion of this application, attempts have been made to convert the wavelength of laser light. . For example, when using a YAG laser device, which is a typical solid-state laser oscillation device, for processing, the shorter the wavelength, the higher the processing accuracy, so a second harmonic generation element is used. In many cases, the wavelength is halved and used. The second harmonic generation element used for converting the wavelength of this YAG laser beam includes Li I O, KT
i OP O,i (KTP) etc. are known,
Devices using these elements are already commercially available.

一般に、このような第二高調波発生素子の変換動作効率
は、入射レーザ光の強度に比例して高くなる性質がある
ため、この変換効率を高めるためには、レーザ光の出力
レベルを高くしなければならないことになる。このため
、従来より、Ｑスイッチを使用して、レーザ光のピーク
出力を上げたり、焦点距離の短いレンズを用いてレーザ
光を強力に集光させたりした後で、第二高調波発生素子
に入射させ、変換されて出てくるレーザ光の出力を上げ
るようにしている。Generally, the conversion efficiency of such a second harmonic generation element increases in proportion to the intensity of the incident laser beam, so in order to increase the conversion efficiency, it is necessary to increase the output level of the laser beam. It will have to be done. For this reason, conventionally, a Q-switch is used to increase the peak output of the laser beam, or a lens with a short focal length is used to focus the laser beam strongly, and then the second harmonic generation element is The output of the laser light that is converted and output is increased.

しかしながら、Ｑスイッチを使用したパルス出力のレー
ザ発振器の場合のように、レーザ光のピーク出力が大き
い場合には比較的容易に高い変換効率を得ることも可能
であるが、連続波発振のレーザ発振器の場合には、出力
レベルがパルスレーザに比べて′Ｉｆ！端に低いので、
高い変換効率は得られないことが知られている。However, when the peak output of laser light is large, as in the case of a pulse output laser oscillator using a Q switch, it is possible to obtain high conversion efficiency relatively easily, but continuous wave oscillation laser oscillators In the case of 'If!', the output level is 'If!' compared to the pulsed laser. Because it is low at the end,
It is known that high conversion efficiency cannot be obtained.

このような問題に対処するために、非線型光学素子を共
発振器の内部に設置し、基本波を繰り返し非線型光学素
子中を通過させて変換効率を上昇させる試みがなされて
きている。たとえば、非線型光学素子としてＢＮＮ　（
Ｂａ　２Ｎａ　Ｎｂ　５０１５）を使用して、変換効率
として　１００％の高い効率も得られている。In order to deal with such problems, attempts have been made to increase the conversion efficiency by installing a nonlinear optical element inside the resonator and repeatedly passing the fundamental wave through the nonlinear optical element. For example, BNN (
A high conversion efficiency of 100% has also been obtained using Ba 2Na Nb 5015).

しかしながら、このような試みにも限界があった。この
ＢＮＮの場合には、いわゆる９０度位相整合と呼ばれる
方式を採用しており、高い変換効率が得られているが、
角度位相整合の方式による場合には、いわゆるウオーク
オフ効果と呼ばれる要因のなめに変換効率が高くならず
、従来はせいぜい２Ｏ％程度の変換効率しか得られてい
なかった。角度位相整合による方式は、実用的にも極め
て重要な方式であることからも、この方式による高い変
換効率でのレーザ光の波長変換の実現が望まれていた。However, such attempts also had limitations. In the case of this BNN, a method called so-called 90 degree phase matching is adopted, and high conversion efficiency is obtained.
In the case of using the angular phase matching method, the conversion efficiency cannot be increased due to a factor called the so-called walk-off effect, and conventionally, a conversion efficiency of about 20% at most has been obtained. Since the method using angular phase matching is a very important method from a practical standpoint, it has been desired to achieve wavelength conversion of laser light with high conversion efficiency using this method.

（発明の目的） この発明は、以上の通りの事情を踏まえてなされたもの
であり、従来法の欠点を改善し、高い変換効率を得るこ
とができるとともに、良質なレーザビームを得ることの
できる第二高調波発生素子を備えてなるレーザ発振装置
を提供することを目的としている。(Purpose of the invention) This invention was made based on the above-mentioned circumstances, and it is possible to improve the drawbacks of the conventional method, obtain high conversion efficiency, and obtain a high-quality laser beam. It is an object of the present invention to provide a laser oscillation device including a second harmonic generation element.

（発明の開示） この発明は、上記の目的を実現するために、共振器内部
に非線型光学結晶体から形成される第二高調波発生素子
を設けて基本波の半分の波長を有するレーザ光を発生さ
せるレーザ発振器において、第二高調波発生素子として
角度位相整き型非線型光学結晶を備え、レーザ光の径と
非線型光学結晶の長さとの調整系を設けてなることを特
徴とする角度位相整合方式による高効率第二高調波発生
レーザ発振器を提供する。(Disclosure of the Invention) In order to achieve the above object, the present invention provides a second harmonic generation element formed from a nonlinear optical crystal inside a resonator to generate a laser beam having a wavelength half that of the fundamental wave. A laser oscillator that generates an angularly phased nonlinear optical crystal as a second harmonic generating element, and an adjustment system for adjusting the diameter of the laser beam and the length of the nonlinear optical crystal. A highly efficient second harmonic generation laser oscillator using an angular phase matching method is provided.

この発明のレーザ発振器においては、共振器から発生さ
せたレーザ光を非線型光学結晶体から形成した第二高調
波発生素子に入射させてレーザ光の波長を変換するが、
この際の非線型光学結晶体としては、角度位相整合型の
結晶を用いる。このような結晶としては、たとえば、Ｋ
Ｔｉ　ＯＰＯ４（ＫＴＰ）、β−Ｂａ　Ｂ２Ｏ４　（Ｂ
ＢＯ）、さらにはＫＤＰ、ＫＤ”Ｐ、ＡＤＰ、ＲＤＰな
どの結晶を用いることができる。In the laser oscillator of the present invention, the wavelength of the laser light is converted by making the laser light generated from the resonator enter the second harmonic generation element formed from a nonlinear optical crystal.
As the nonlinear optical crystal in this case, an angular phase matching crystal is used. Such crystals include, for example, K
Ti OPO4 (KTP), β-Ba B2O4 (B
Crystals such as BO), KDP, KD''P, ADP, and RDP can be used.

角度位相整合型の非線型光学結晶体を用いて、レーザ光
のビーム径とこの結晶体との長さを調整することにより
、高効率の第二高調波発生を実現するが、この場合、従
来の９０度位相整合の場合とは異って、いわゆるウオー
クオフ効果による作用を考慮することが必要となる。Highly efficient second harmonic generation is achieved by adjusting the beam diameter of the laser beam and the length of this crystal using an angular phase matching type nonlinear optical crystal. Unlike the case of 90 degree phase matching, it is necessary to take into consideration the so-called walk-off effect.

すなわち、非線型光学結晶は複屈折性結晶であるが、こ
のような結晶中においては、一般に等位相波面の進行方
向とエネルギーの伝播する光線方向とが一致せず、ずれ
が生じる。これをウオークオフ効果と呼ぶが、この効果
が生ずると、非線型光学結晶のある規定された長さ部分
しか作用効果がなく、長い単結晶を非線型光学素子とし
て使用しても効率は良くならない。That is, a nonlinear optical crystal is a birefringent crystal, but in such a crystal, the traveling direction of an equiphase wavefront generally does not match the direction of a light beam in which energy propagates, and a shift occurs. This is called the walk-off effect, and when this effect occurs, the nonlinear optical crystal will only have an effect over a certain specified length, and the efficiency will not improve even if a long single crystal is used as a nonlinear optical element. .

この発明においては、このようなウオークオフ効果をも
考慮して、最も高い変換効率を得るように、レーザ光の
径と、角度位相整合型非線型結晶の長さとを調整する。In the present invention, the diameter of the laser beam and the length of the angle phase matching type nonlinear crystal are adjusted in consideration of such a walk-off effect so as to obtain the highest conversion efficiency.

より具体的には、たとえば集光用コリメートレンズ系等
を用いて調整する。More specifically, the adjustment is performed using, for example, a collimating lens system for condensing light.

この場合、次式（ａ） Ａ：レーザ装置規定定数 ρ：ニラオークオフ ｄ：非線型光学結晶の非線型光学定数 ｎ：非線型光学結晶中の屈折率 の関係を満たすように、レーザ媒体中のレーザ光の直径
りが得られるようにする。なお、Ａはレーザ発振器固有
の定数で、たとえば、ＹＡＧレーザの場合２．８ｘｌＯ
’、アルゴンレーザで２．９ｘｌＯ’程度である。また
、このような条件下において、次式（ｂ） の関係に沿って、非線型光学結晶の長さしと、非線型光
学結晶中のレーザ光の直径り。とを調整することができ
る。In this case, the following formula (a) is applied. Make sure you get the right diameter of light. Note that A is a constant specific to the laser oscillator, for example, 2.8xlO in the case of a YAG laser.
', and about 2.9xlO' with an argon laser. Under these conditions, the length of the nonlinear optical crystal and the diameter of the laser beam in the nonlinear optical crystal are determined according to the relationship expressed by the following equation (b). and can be adjusted.

上記式（ａ）（ｂ）に関連して、ρ（ウオークオフ角）
、ｄ（非線型定数）、ｎ（屈折率）について例示すると
、次の表のようになる。In relation to the above formulas (a) and (b), ρ (walk-off angle)
, d (nonlinear constant), and n (refractive index) are shown in the following table.

この発明のレーザ発振器は、添けした図面の第１図に示
したような構成とすることができる。たとえば、この第
１図に示したように、レーザ発振素子（１）、出力ミラ
ー（２）および平面全反射ミラー（３）を有し、この出
力ミラー（２）と平面全反射ミラー（３）との間に、集
光用コリメートレンズ（４）および非線型光学結晶を用
いた第二高調波発生素子（５）を設けることができる。The laser oscillator of the present invention can have a configuration as shown in FIG. 1 of the attached drawings. For example, as shown in FIG. 1, it has a laser oscillation element (1), an output mirror (2), and a flat total reflection mirror (3), and this output mirror (2) and the flat total reflection mirror (3) A condensing collimating lens (4) and a second harmonic generation element (5) using a nonlinear optical crystal can be provided between the two.

なお、コリメート用のレンズ系として第２図（ａ）（ｂ
）（ｃ）に示したようなものを用いることもできる。す
なわち、 （ａ）　　出力ミラーの前に、凸レンズおよび凹レンズ
を配する。In addition, as a collimating lens system, Fig. 2 (a) (b)
) (c) can also be used. That is, (a) a convex lens and a concave lens are placed in front of the output mirror.

＜ｂ＞　　出力ミラーの前に、凸レンズを配する。<b> A convex lens is placed in front of the output mirror.

（ｃ）　　出力ミラーの前に、二つの凹面鏡を配する。(c) Place two concave mirrors in front of the output mirror.

次に、第１図を参照しつつ、この発明のレーザ発振器に
ついて、実施例を示す。Next, an embodiment of the laser oscillator of the present invention will be described with reference to FIG.

実施例　１ 第１図に示した装置の構成において、第二高調波発生素
子としてＢＢＯを用い、ＹＡＧロッドをレーザ発振素子
とした。Example 1 In the configuration of the apparatus shown in FIG. 1, a BBO was used as the second harmonic generation element, and a YAG rod was used as the laser oscillation element.

このＹＡＧロッド中のレーザビームの径（Ｄ＞は、装置
の定数（Ａ）を２．８ｘ　１０　’とすると、Ｄ≧９．
２關となる。この条件下で、最も高い変換効率を得るた
めには、前述の式（ｂ）に従って、Ｌ＝１５２Ｄｏ／Ｄ
の関係を満足すればよい。The diameter (D>) of the laser beam in this YAG rod is D≧9, assuming that the constant (A) of the device is 2.8x 10'.
It becomes the second issue. Under this condition, in order to obtain the highest conversion efficiency, L=152Do/D according to equation (b) above.
It is sufficient to satisfy the relationship.

このため、このＬ＝１５２Ｄｏ／Ｄに沿って、非線型光
学結晶の長さ（Ｌ）と、非線型光学結晶中のレーザ光の
径（Ｄｏ）とをコリメートレンズを用いて調整した。変
換効率は、１００％であった。Therefore, along this L=152Do/D, the length (L) of the nonlinear optical crystal and the diameter (Do) of the laser beam in the nonlinear optical crystal were adjusted using a collimating lens. Conversion efficiency was 100%.

実施例　２ 非線型光学結晶として、ＫＴＰを用いた。実施例１と同
様にして、ＹＡＧロッド中のレーザ光の径（Ｄ）は、Ｄ
≧Ｏ，，４４ｎ＋ｎとなる。Example 2 KTP was used as a nonlinear optical crystal. Similarly to Example 1, the diameter (D) of the laser beam in the YAG rod is D
≧O, 44n+n.

この条ｆ士下で最も高い変換効率を得るための条件は、
Ｌ＝２２．３Ｄｏ／Ｄとなる。The conditions for obtaining the highest conversion efficiency under this article are as follows:
L=22.3Do/D.

非線型光学結晶の長さ（Ｌ）とこの結晶中のレーザ光の
径（Ｄ。）とを、この関係に沿ってコリメートレンズを
用いて！ｌ整した。８０％を越える高い変換効率が得ら
れた。この効率は、従来のものの５１３にも達する高い
効率である。Using a collimating lens, set the length (L) of the nonlinear optical crystal and the diameter (D.) of the laser beam in this crystal according to this relationship! I've adjusted it. A high conversion efficiency of over 80% was obtained. This efficiency is as high as 513 compared to the conventional one.

（発明の効果） この発明により、以上詳しく説明したように、共振？利
の内部に角度位相整合型非線型光学結晶からなる素子を
設け、レーザ光の径と非線型光学結晶の長さを調整する
ことにより、高い変換効率によって第二高調波が実現さ
れる。(Effects of the Invention) With this invention, as explained in detail above, resonance? By providing an element made of an angle phase matching type nonlinear optical crystal inside the laser beam and adjusting the diameter of the laser beam and the length of the nonlinear optical crystal, the second harmonic can be realized with high conversion efficiency.

このようなレーザ発振装置は、学術界においては、生物
学、化学等の分野で主として用いられるスペクトロスコ
ピーや、光化学反応等の光源として、また、産業界にお
いては、精密加工用光源あるいは精密計測用光源として
極めて有用なものである。In the academic world, such laser oscillation devices are used as light sources for spectroscopy and photochemical reactions, which are mainly used in fields such as biology and chemistry, and in the industrial world, they are used as light sources for precision processing and precision measurement. It is extremely useful as a light source.

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

第１図は、この発明の装置の構成例を示したブロック図
である。 第２図（ａ）（ｂ）（ｃ）は、各々、コリメート用レン
ズ系の例を示した配置図である。 １・・・レーザ発振素子 ２・・・出力ミラー ３・・・平面全反射ミラー ４・・・集光用コリメートレンズ ５・・・第二高調波発生素子 代理人弁理士　　西　　澤　　利　　大筒　　２　　図FIG. 1 is a block diagram showing an example of the configuration of an apparatus according to the present invention. FIGS. 2(a), 2(b), and 2(c) are layout diagrams each showing an example of a collimating lens system. 1...Laser oscillation element 2...Output mirror 3...Flat total reflection mirror 4...Collimating lens for focusing 5...Second harmonic generation element Patent attorney Toshi Nishizawa Otsutsu 2 Figure

Claims (3)

【特許請求の範囲】[Claims] （１）共振器内部に非線型光学結晶体から形成される第
二高調波発生素子を設けて基本波の半分の波長を有する
レーザ光を発生させるレーザ発振器において、第二高調
波発生素子として角度位相整合型非線型光学結晶を備え
、レーザ光の径と非線型光学結晶の長さとの調整系を設
けてなることを特徴とする角度位相整合方式による高効
率第二高調波発生レーザ発振器。(1) In a laser oscillator in which a second harmonic generating element formed of a nonlinear optical crystal is provided inside a resonator to generate laser light having a wavelength half that of the fundamental wave, the second harmonic generating element is A highly efficient second harmonic generation laser oscillator using an angular phase matching method, comprising a phase matching nonlinear optical crystal and an adjustment system for adjusting the diameter of the laser beam and the length of the nonlinear optical crystal. （２）非線型光学結晶として、 β−ＢａＢ＿２Ｏ＿４またはＫＴｉＯＰＯ＿４結晶を用
いる特許請求の範囲第（１）項記載の高効率第二高調波
発生レーザ発振器。(2) A highly efficient second harmonic generation laser oscillator according to claim (1), which uses β-BaB_2O_4 or KTiOPO_4 crystal as the nonlinear optical crystal. （３）集光用コリメートレンズを用いる特許請求の範囲
第（１）項記載の高効率第二高調波発生レーザ発振器。(3) A highly efficient second harmonic generation laser oscillator according to claim (1), which uses a collimating lens for condensing light.
JP28588487A 1987-11-12 1987-11-12 High-efficiency second harmonic generating laser oscillator Pending JPH01128484A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28588487A JPH01128484A (en) 1987-11-12 1987-11-12 High-efficiency second harmonic generating laser oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28588487A JPH01128484A (en) 1987-11-12 1987-11-12 High-efficiency second harmonic generating laser oscillator

Publications (1)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004214674A (en) * 2003-01-06 2004-07-29 Unitek Miyachi Internatl Ltd Optical harmonics generation apparatus and method
JP2007133445A (en) * 2007-02-23 2007-05-31 Sony Corp Wavelength conversion device
US20120012759A1 (en) * 2007-12-07 2012-01-19 Hiroyuki Furuya Wavelength conversion laser light source, laser light source device and two-dimensional image display device adopting the same, and method of setting temperature of wavelength conversion element
CN102485361A (en) * 2010-12-01 2012-06-06 东港市低压电器附件厂 Food waste environment friendly disposer
CN103782458A (en) * 2011-07-22 2014-05-07 科磊股份有限公司 Laser with high quality, stable output beam, and long life high conversion efficiency non-linear crystal
JP2014517514A (en) * 2011-05-09 2014-07-17 トルンプフ レーザー マーキング システムズ アクチエンゲゼルシャフト Laser resonator for forming a frequency converted laser beam

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62104092A (en) * 1985-04-17 1987-05-14 クワントロニツクス　コ−ポレ−シヨン Frequency doubling laser
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62104092A (en) * 1985-04-17 1987-05-14 クワントロニツクス　コ−ポレ−シヨン Frequency doubling laser
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

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004214674A (en) * 2003-01-06 2004-07-29 Unitek Miyachi Internatl Ltd Optical harmonics generation apparatus and method
JP2007133445A (en) * 2007-02-23 2007-05-31 Sony Corp Wavelength conversion device
US20120012759A1 (en) * 2007-12-07 2012-01-19 Hiroyuki Furuya Wavelength conversion laser light source, laser light source device and two-dimensional image display device adopting the same, and method of setting temperature of wavelength conversion element
US8411714B2 (en) * 2007-12-07 2013-04-02 Panasonic Corporation Wavelength conversion laser light source, laser light source device and two-dimensional image display device adopting the same, and method of setting temperature of wavelength conversion element
CN102485361A (en) * 2010-12-01 2012-06-06 东港市低压电器附件厂 Food waste environment friendly disposer
JP2014517514A (en) * 2011-05-09 2014-07-17 トルンプフ レーザー マーキング システムズ アクチエンゲゼルシャフト Laser resonator for forming a frequency converted laser beam
CN103782458A (en) * 2011-07-22 2014-05-07 科磊股份有限公司 Laser with high quality, stable output beam, and long life high conversion efficiency non-linear crystal

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