WO2016026377A1 - 具有冷却功能的光学元件 - Google Patents

具有冷却功能的光学元件 Download PDF

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Publication number
WO2016026377A1
WO2016026377A1 PCT/CN2015/085634 CN2015085634W WO2016026377A1 WO 2016026377 A1 WO2016026377 A1 WO 2016026377A1 CN 2015085634 W CN2015085634 W CN 2015085634W WO 2016026377 A1 WO2016026377 A1 WO 2016026377A1
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optical
cooling function
function according
optical element
liquid
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PCT/CN2015/085634
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English (en)
French (fr)
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方强
方笑尘
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方强
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    • 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
    • H01S3/02—Constructional details
    • H01S3/04—Arrangements for thermal management

Definitions

  • the present invention relates to an optical component, and more particularly to an optical component having a cooling function, which can be widely used in a high power laser system.
  • the light emitted by the laser is transmitted to the operating point via the optical system, and the optical components that make up the optical system cause thermal lensing due to the heat introduced by the intense light.
  • a cooling device is usually added around the periphery of the optical element.
  • this cooling method does not fundamentally solve the thermal lensing effect. To compensate for the effects of thermal lensing, it is necessary to increase system complexity or reduce system performance.
  • An optical element having a cooling function consisting of at least two optical elements and a fluid, wherein: the fluid flows between two adjacent optical elements.
  • At least one of the optical elements is a lens.
  • At least one of the optical elements is an optical thin film device.
  • At least one of the optical elements is a crystalline element.
  • At least one of the optical elements is an optically active element.
  • the fluid is either a liquid or a gas.
  • the liquid is either water or a liquid organic.
  • the gas is either dry air, either nitrogen or an inert gas.
  • the optical thin film device is either a mirror, or an inverting mirror, or a polarizer, or a dichroic mirror, or a beam splitter.
  • the effect of the invention is that the photothermographic lens effect of the optical component can be greatly reduced, the system complexity is reduced, and the system performance is improved.
  • FIG. 1 is a schematic structural view of an optical element having a cooling function according to the present invention.
  • FIG. 2 is a schematic view showing the structure of a lens element having a cooling function according to the present invention.
  • FIG. 3 is a schematic view showing the structure of a lens element and an optical film element having a cooling function according to the present invention.
  • FIG. 4 is a schematic view showing the structure of a lens element, a crystal element, and an optical film element of the optical element having a cooling function according to the present invention.
  • FIG. 5 is a junction of an optical film element and an optical element having a cooling function according to the present invention. Schematic diagram.
  • OEN respectively represent optical elements
  • OL1 and OL2 respectively represent optical lenses
  • L1, L2 and L(N-1) respectively represent fluids
  • OT1 and OT2 respectively represent thin film optics Element
  • OC1 represents a crystal element
  • OS1 represents an optical element.
  • N is a schematic structural view of an optical element having a cooling function according to the present invention, wherein N (N is greater than or equal to 2) optical elements OE1, OE2, ..., OE(N-1), OEN, and N-1 fluids L1. L2, ..., L(N-1), the fluid is located between two adjacent optical elements.
  • the fluid may be a liquid or a gas, and its function is to quickly carry the heat in the device, thereby eliminating or greatly reducing the thermal lens effect.
  • the liquid can be water or a transparent liquid organic such as glycerin.
  • the gas may be dry air, nitrogen or an inert gas or the like.
  • the optical element may be a lens constituting a lens device for collimation, focusing or imaging of a strong laser beam.
  • the optical fiber component may be a thin film optical component, and depending on the function of the thin film, a reflective device, a transmissive device, a spectroscopic device, a polarizing device, a dichroic mirror, and the like may be formed.
  • the optical element can also be a crystal element, and can perform functions such as conversion, offset, and optical rotation of the optical polarization state in the optical path.
  • the optical element can also be an optically active element for effecting isolation of the returning beam in the optical path.
  • FIG. 2 is a schematic view showing the structure of a lens element having a cooling function according to the present invention.
  • the element consists of two optical lenses OL1, OL2 and a fluid L1 between the two lenses.
  • OL1, OL2 optical lenses
  • L1 fluid between the two lenses.
  • This lens is suitable for use in laser systems with large beam quality parameters, ensuring high quality beam delivery compared to conventional single lenses.
  • FIG. 3 is a schematic view showing the structure of a lens element and an optical film element having a cooling function according to the present invention.
  • This element consists of an optical lens OL1, an optical film element OT1 and a fluid L1 between the elements.
  • the optical film element OT1 is a transmissive device, the element can be regarded as an optical lens with a protective glass, which can be used in a laser processing system.
  • the optical film element OT1 is a dichroic mirror, the element can be used in a fiber laser system as a laser cavity mirror and can also be used in a wavelength division multiplexing system.
  • the optical film element OT1 is a full mirror, the device can be used as a cavity mirror in a fiber laser system.
  • FIG. 4 is a schematic view showing the structure of a lens element, a crystal element, and an optical film element of the optical element having a cooling function according to the present invention.
  • the element consists of an optical lens OL1, a crystal element OC1, an optical film element OT1 and fluids L1, L2 between the elements.
  • the optical power is small, a flowing gas can be used, and when the power is large, a fluid liquid is required.
  • the crystal element OC1 is a quarter-wave plate
  • the optical film element OT1 is a transmissive device, and the device has a function of converting linearly polarized light into circularly polarized light, which can be used in a laser cutting system. Used as a focusing lens.
  • FIG. 5 is a schematic structural view of an optical film element and an optical rotatory element having a cooling function according to the present invention.
  • This element consists of an optical film element OT1, an optical element OS1 and a fluid L1 between the elements.
  • a flowing gas can be used, and when the power is large, a fluid liquid is required.
  • the optical film element OT1 is a polarizing device and the optical rotator OS1 is a 45-degree rotator, the device has a function of isolating light and can be used in a laser nuclear fusion system.
  • the optical element with cooling function proposed by the invention can eliminate the photothermal effect in the glare system, simplify the system design and reduce the cost.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

一种具有冷却功能的光学元件，由至少两个光学元件（OE1、OE2）和流体（L1）组成，流体（L1）在两个相邻的光学元件（OE1、OE2）间流动。具有冷却功能的光学元件可广泛应用于大功率激光系统中，可以大幅降低光学元件的光致热透镜效应，降低系统复杂度，提升系统性能。

Description

具有冷却功能的光学元件 技术领域
本发明涉及一种光学元件，特别是一种具有冷却功能的光学元件，可广泛应用于大功率激光系统中。
背景技术
在大功率激光系统中，激光器发出的光要经光学系统传输到工作点，组成光学系统的光学元件在强光引入的热量的作用下会导致热透镜效应。目前，为了减少光致热效应的影响，通常在光学元件的周边加有冷却装置。但是，由于玻璃的导热率低，这种冷却方式无法从根本上解决热透镜效应。为了补偿热透镜效应的影响，就需增加系统复杂度，或降低系统的性能。
本发明的目的是提供一种具有冷却功能的光学元件，可以大幅降低大功率激光应用中光致热效应的影响，降低光学系统的复杂度并提升光学系统的性能。
发明内容
本发明的技术方案概括如下：
一种具有冷却功能的光学元件，由至少两个光学元件和流体组成，其中：流体在两个相邻的光学元件间流动。
所述光学元件中至少一个是透镜。
所述光学元件中至少一个是光学薄膜器件。
所述光学元件中至少一个是晶体元件。
所述光学元件中至少一个是旋光元件。
所述流体或者是液体，或者是气体。
所述液体或者是水，或者是液态有机物。
所述气体或者是干燥空气、或者是氮气，或者是惰性气体。
所述光学薄膜器件或者是反射镜，或者是减反镜，或者是偏振镜，或者是二向色镜，或者是分光镜。
本发明的效果在于：可以大幅降低光学元件的光致热透镜效应，降低系统复杂度，提升系统性能。
附图说明
图1为本发明提出的具有冷却功能的光学元件的结构示意图。
图2为本发明提出的具有冷却功能的光学元件的一种包含透镜元件的结构示意图。
图3为本发明提出的具有冷却功能的光学元件的一种包含透镜元件和光学薄膜元件的结构示意图。
图4为本发明提出的具有冷却功能的光学元件的一种包含透镜元件、晶体元件和光学薄膜元件的结构示意图。
图5为本发明提出的具有冷却功能的光学元件的一种包含光学薄膜元件和旋光元件的结 构示意图。
其中：OE1、OE2、…、OE(N-1)、OEN分别表示光学元件；OL1和OL2分别表示光学透镜；L1、L2和L(N-1)分别表示流体；OT1和OT2分别表示薄膜光学元件；OC1表示晶体元件；OS1表示旋光元件。
具体实施方式
下面结合附图和实施例详细说明本发明提出的具有冷却功能的光学元件。
图1为本发明提出的具有冷却功能的光学元件的结构示意图，由N(N大于等于2)个光学元件OE1、OE2、…、OE(N-1)、OEN和N-1个流体L1、L2、…、L(N-1)组成，流体位于两相邻光学元件间。
在该具有冷却功能的光学元件中，流体可以是液体，也可以是气体，其功能是将器件中的热量快速携带出来，从而消除或大幅降低热透镜效应。液体可以是水，也可以是透明的液态有机物，如甘油。气体可以是干燥空气、氮气或惰性气体等。
在该具有冷却功能的光学元件中，光学元件可以是透镜，组成透镜器件，用于强激光光束的准直、聚焦或成像。光纤元件可以是薄膜光学元件，根据薄膜的功能，可以形成反射器件、透射器件、分光器件、偏振器件和二向色镜等。光学元件也可以是晶体元件，可以在光路中进行光学偏振态的转换、偏移及旋光等功能。光学元件还可以是旋光元件，用于在光路中实现回向光束的隔离。
图2为本发明提出的具有冷却功能的光学元件的一种包含透镜元件的结构示意图。该元件由两个光学透镜OL1、OL2和在两透镜间的流体L1组成。当光功率较小时，可以用流动气体，当功率较大时，就需要流体的液体。这种透镜适合应用于光束质量参数较大的激光系统中，与传统的单透镜相比，可以保证高质量的光束传递。
图3为本发明提出的具有冷却功能的光学元件的一种包含透镜元件和光学薄膜元件的结构示意图。该元件由光学透镜OL1、光学薄膜元件OT1和在元件间的流体L1组成。当光功率较小时，可以用流动气体，当功率较大时，就需要流体的液体。在该元件中，如果光学薄膜元件OT1是一个透射器件，该元件可以看成是带有保护玻璃的光学透镜，可以用在激光加工系统中。如果光学薄膜元件OT1是一二向色镜，该元件可以用在光纤激光系统中，作为激光腔镜用，还可以用在波分复用系统中。如果光学薄膜元件OT1是一全反镜，该器件可以用在光纤激光系统中作为腔镜。
图4为本发明提出的具有冷却功能的光学元件的一种包含透镜元件、晶体元件和光学薄膜元件的结构示意图。该元件由光学透镜OL1、晶体元件OC1、光学薄膜元件OT1和在元件间的流体L1、L2组成。当光功率较小时，可以用流动气体，当功率较大时，就需要流体的液体。在该元件中，如果晶体元件OC1是一个四分之一波片，光学薄膜元件OT1是一个透射器件，该器件就具有将线偏振光转换成园偏振光的功能，可以用在激光切割系统中，作为聚焦透镜使用。
图5为本发明提出的具有冷却功能的光学元件的一种包含光学薄膜元件和旋光元件的结构示意图。该元件由光学薄膜元件OT1、旋光元件OS1和在元件间的流体L1组成。当光功率较小时，可以用流动气体，当功率较大时，就需要流体的液体。在该元件中，如果光学薄膜元件OT1是一个偏振器件，旋光器件OS1是一个45度旋光器，该器件就具有将光隔离功能，可以用在激光核聚变系统中。
本发明提出的具有冷却功能的光学元件，可以消除强光系统中的光致热效应，简化系统设计，降低成本。

Claims (9)

  1. 一种具有冷却功能的光学元件，其特征是：由至少两个光学元件和流体组成，流体在两个相邻的光学元件间流动。
  2. 根据权利要求1所述的具有冷却功能的光学元件，其特征是：所述光学元件中至少一个是透镜。
  3. 根据权利要求1所述的具有冷却功能的光学元件，其特征是：所述光学元件中至少一个是光学薄膜器件。
  4. 根据权利要求1所述的具有冷却功能的光学元件，其特征是：所述光学元件中至少一个是晶体元件。
  5. 根据权利要求1所述的具有冷却功能的光学元件，其特征是：所述光学元件中至少一个是旋光元件。
  6. 根据权利要求1所述的具有冷却功能的光学元件，其特征是：所述流体或者是液体，或者是气体。
  7. 根据权利要求6所述的具有冷却功能的光学元件，其特征是：所述液体或者是水，或者是液态有机物。
  8. 根据权利要求6所述的具有冷却功能的光学元件，其特征是：所述气体或者是干燥空气、或者是氮气，或者是惰性气体。
  9. 根据权利要求3所述的具有冷却功能的光学元件，其特征是：所述光学薄膜器件或者是反射镜，或者是减反镜，或者是偏振镜，或者是二向色镜，或者是分光镜。
PCT/CN2015/085634 2014-08-21 2015-07-30 具有冷却功能的光学元件 WO2016026377A1 (zh)

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