CN107306006A - 一种同向偏振双端抽运1.9 1μm Tm:YLF激光器 - Google Patents

一种同向偏振双端抽运1.9 1μm Tm:YLF激光器 Download PDF

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CN107306006A
CN107306006A CN201610242803.7A CN201610242803A CN107306006A CN 107306006 A CN107306006 A CN 107306006A CN 201610242803 A CN201610242803 A CN 201610242803A CN 107306006 A CN107306006 A CN 107306006A
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laser
pumping
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ylf
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金光勇
李玥
刘景良
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Changchun University of Science and Technology
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • H01S3/091Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08Construction or shape of optical resonators or components thereof
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08Construction or shape of optical resonators or components thereof
    • H01S3/08059Constructional details of the reflector, e.g. shape

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

同向偏振双端抽运1.9 1μm Tm:YLF激光器涉及一种固体激光器。它解决了现有的1.91μm Tm:YLF激光器难以实现的高功率激光输出的问题。该激光器采用45°偏振分光器将泵浦光分成π、σ两束相互垂直的偏振光,其中一束σ偏振光经聚焦透镜入射至Tm:YLF激光晶体的前端面,另一束π偏振光经激光偏振转换器转换成同向偏振的σ偏振光后再通过聚焦透镜入射至Tm:YLF激光晶体的后端面,从而实现对Tm:YLF激光晶体的同向偏振双端抽运,抽运光经1.91μm激光耦合镜耦合输出。本发明适用于提供高输出功率、高光束质量的1.91μm Tm:YLF的激光。

Description

一种同向偏振双端抽运1.9 1μm Tm:YLF激光器
技术领域 本发明属于固体激光技术领域,涉及一种双端抽运激光器,尤其是涉及一种同向偏振双端抽运1.9 1μm Tm:YLF激光器。
背景技术 2um固体激光器处于人眼安全波段,又是产生3-5μm、8-12μm中红外激光的基础,近-中红外可调谐激光是光电对抗、激光雷达等领域的理想干扰源,受到许多激光器件研究者的关注。2um波长的激光在激光测距、激光遥感、激光成像、激光医学、科学仪器、材料处理、光学信号处理等领域已显示出越来越广泛的应用前景。Tm:YLF(掺铥氟化钇锂)激光器是一种重要的中红外激光光源,Tm:YLF激光器体积小,重量轻、供电简单、结构紧凑、和便于携带、便于维护和操作等优点。低温条件下工作的Tm固体激光器是获得2μm波段大功率激光输出的有效途径之一。Tm:YLF激光器发射1.91μm波长的中红外激光正好位于Ho(钬)激光材料的吸收峰,因而被广泛用作Ho激光器泵源以产生2um人眼安全激光。
国内外学者对于Tm:YLF激光器抽运技术进行了大量的理论和实验研究,其激光器的主要的抽运方式有:单端抽运、单LD双端抽运及双LD双端抽运,这些抽运技术都没有采用同向偏振技术,也都没有有效的解决激光Tm:YLF激光晶体热效应。由于Tm:YLF激光晶体的偏振吸收特性,不能使有效的偏振抽运光转化为激光辐射,还有相当一部分抽运光在Tm:YLF激光晶体内转化成废热,从而影响激光输出特性。为此,采用同向偏振双端抽运技术对Tm:YLF激光晶体注入有效的偏振光且有效地增强了抽运光的均匀性,使Tm:YLF激光晶体充分吸收有效的偏振光产生较少的热效应,有效的降低Tm:YLF激光晶体的热效应,提高了抽运效率及激光输出特性。
发明内容 本发明是为了解决现有1.9 1μm Tm:YLF激光器抗光损伤阈值低,热效应难管理的问题,从而提出一种获取高输出功率、高光束质量的1.91μm Tm:YLF激光器。
本发明的同向偏振双端抽运1.9 1μm Tm:YLF激光器,它包括激光二极管抽运源、一号平凸透镜、二号平凸透镜、三号平凸透镜、45°偏振分光器、激光全反镜、Tm:YLF激光 晶体、一号抽运光全反镜、二号抽运光全反镜、三号抽运光全反镜、激光偏振转换器、45°激光全反镜、1.91μm激光输出耦合镜。
系统入射的激光二极管抽运光经一号平凸透镜聚焦透射至45°偏振分光器,抽运光被45°偏振分光器分成π、σ两束相互垂直的偏振光,σ偏振光经二号平凸透镜聚焦透射至激光全反镜,σ偏振光经激光全反镜透射入射至Tm:YLF激光晶体的前端面,π偏振光经一号抽运光全反镜反射至激光偏振转换器,π偏振光经激光偏振转换器转变为σ偏振光,所述σ偏振光经二号抽运光全反镜反射至三号抽运光全反镜,经三号抽运光全反镜反射至三号平凸透镜,经三号平凸透镜透射至45°激光全反镜,经45°激光全反镜透射入射至Tm:YLF激光晶体的后端面,Tm:YLF激光晶体吸收同向偏振抽运光产生1.91μm激光辐射,经所述1.91μm激光输出耦合镜耦合输出。
本发明采用同向偏振双端抽运的装置结构,对Tm:YLF激光晶体注入有效的偏振光且有效地增强了抽运光的均匀性,使Tm:YLF激光晶体充分吸收有效的偏振光产生较少的热效应,降低Tm:YLF激光晶体热效应,使Tm:YLF激光器获得1.91μm高输出功率、高光束质量的激光输出。
附图说明 图1是本发明的一种同向偏振双端抽运1.9 1μm Tm:YLF激光器装置示意图。
具体实施方式 结合图1说明本具体实施方式。本发明的同向偏振双端抽运1.9 1μm Tm:YLF激光器,它包括激光二极管抽运源1、一号平凸透镜2、45°偏振分光器3、二号平凸透镜4、激光全反镜5、Tm:YLF激光晶体6、45°激光全反镜7、三号平凸透镜8、三号抽运光全反镜9、二号抽运光全反镜10、激光偏振转换器11、一号抽运光全反镜12、1.91μm激光输出耦合镜13。
中心波长为792nm激光二极管1输出792nm抽运光,抽运光入射至焦距为35mm,两面均镀有792nm(R<0.5%)抗反射膜的一号平凸透镜2聚焦透射至镀有792nm偏振膜的45°偏振分光器3,抽运光被45°偏振分光器3分成π、σ两束相互垂直的偏振光,σ偏振光经焦距为75mm,两面也均镀有792nm(R<0.5%)抗反射膜的二号平凸透镜4聚焦透射至镀有的1.91μm(R>99.5%)增透膜和792nm(R<0.5%)抗反射膜的激光全反镜5,σ偏振光经激光全反镜5透射入射至激光晶体尺寸为1.5mm×12mm×20mm,激光晶体掺杂浓度为3%, 激光晶体两端面均镀有792nm及1.91μm增透膜的Tm:YLF激光晶体6的前端面,π偏振光经镀有792nm(R>99.5%)高反膜的一号抽运光全反镜12反射至792nm激光偏振转换器11,π偏振光经激光偏振转换器11转变为σ偏振光,所述σ偏振光经镀有792nm(R>99.5%)高反膜的二号抽运光全反镜10反射至镀有792nm(R>99.5%)高反膜的三号抽运光全反镜9,经三号抽运光全反镜9反射至焦距为75mm,两面均镀有792nm(R<0.5%)抗反射膜的三号平凸透镜8,经三号平凸透镜8透射至两面分别镀有1.91μm高反膜(R>99.5%)及792nm高透(T>95%)膜的45°激光全反镜7,经45°激光全反镜7透射入射至激光晶体尺寸为1.5mm×12mm×20mm,激光晶体掺杂浓度为3%,激光晶体两端面均镀有792nm及1.91μm增透膜的Tm:YLF激光晶体6的后端面,Tm:YLF激光晶体6吸收同向偏振抽运光产生1.91μm激光辐射,经所述1.91μm激光输出耦合镜耦合输出。
在此激光器装置中,由于利用了同向偏振双端抽运技术,它有效地增强了抽运激光的抽运均匀性及Tm:YLF激光晶体的有效吸收,进而减小了Tm:YLF激光晶体的热效应,增强了抽运光的吸收效率。采用上述装置,用W的792nm激光二极管同向偏振双端抽运Tm;YLF可以获得W的激光的高效率、高光束质量输出。

Claims (10)

1.同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:激光二极管抽运源(1)、一号平凸透镜(2)、45°偏振分光器(3)、二号平凸透镜(4)、激光全反镜(5)、Tm:YLF激光晶体(6)、45°激光全反镜(7)、三号平凸透镜(8)、三号抽运光全反镜(9)、二号抽运光全反镜(10)、激光偏振转换器(11)、一号抽运光全反镜(12)、1.91μm激光输出耦合镜(13)。
利用45°偏振分光器将激光二极管输出的中心波长为792nm抽运光分成π、σ两束相互垂直的偏振光,σ偏振光经45°偏振分光镜聚焦透镜入射至Tm:YLF激光晶体前端面,π偏振光经激光偏振转换器转换成σ偏振光后再聚焦透镜入射至Tm:YLF激光晶体的后端面。两束同向偏振抽运光被Tm:YLF激光晶体吸收后在激光谐振腔内振荡放大经1.91μm激光耦合镜耦合输出。
2.根据权利要求1所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:所述的激光二极管抽运光的输出波长为792nm。
3.根据权利要求2所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:45°分光镜镀792nm偏振膜,将抽运光分成相互垂直的两束偏振光。
4.根据权利要求3所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:一号平凸透镜、二号平凸透镜、三号平凸透镜均镀有792nm(R<0.5%)抗反射膜。
5.根据权利要求4所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:一号平凸透镜、二号平凸透镜、三号平凸透镜的直径20mm、厚3mm。
6.根据权利要求5所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:激光晶体尺寸为1.5mm×12mm×20mm,掺杂浓度为%,激光晶体两端面均镀有792nm及1.91μm增透膜。
7.根据权利要求6所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:45°激光全反镜镀有1.91μm高反膜(R>99.5%)及792nm高透(T>95%)膜的。
8.根据权利要求7所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:一号抽运光全反镜、二号抽运光全反镜、三号抽运光全反镜镀有792nm(R>99.5%)高反膜。
9.根据权利要求8所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:一号抽运光全反镜、二号抽运光全反镜、三号抽运光全反镜均为直径为20mm,厚3mm的平面镜。
10.根据权利要求9所述的同向偏振双端抽运1.9 1μm Tm:YLF激光器,其特征是:直径为20mm,曲率半径为150mm,1.91μm增透膜的激光输出耦合镜为平凹镜。
CN201610242803.7A 2016-04-18 2016-04-18 一种同向偏振双端抽运1.9 1μm Tm:YLF激光器 Pending CN107306006A (zh)

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Application publication date: 20171031