技术领域technical field
本发明涉及一种采用拉伸方法实现波长调谐的随机激光器，属于光电技术领域。The invention relates to a random laser which adopts a stretching method to realize wavelength tuning, and belongs to the field of optoelectronic technology.
背景技术Background technique
1966年，前苏联N.G.Basov等人利用散射表面代替传统激光器谐振腔的一个反射镜，实现了一种可提供非谐振反馈的激光谐振腔，他们预言在无序结构中随机散射可以提供正反馈而使光放大。1968年，前苏联科学院V.S.Letokhov等人首次计算了随机增益介质中光放大和散射的光学特性，提出了随机增益介质中的激光辐射现象。随机激光器的原理如图1所示。1994年，美国布朗大学的Lawandy等人用激光束泵浦掺有含Al2O3外壳的TiO2的染料溶液，实验上观察到该系统的激光多模谐振现象，从而验证了Letokhov提出的随机增益介质中存在随机激光现象的理论，这就是最早的随机激光器。所以说，随机激光的谐振腔是多个散射颗粒，而不是传统的镜面。In 1966, NGBasov and others of the former Soviet Union realized a laser resonator that can provide non-resonant feedback by using a scattering surface instead of a mirror in a traditional laser resonator. They predicted that random scattering in a disordered structure can provide positive feedback and make Light magnifies. In 1968, the former Soviet Academy of Sciences VSLetokhov and others calculated the optical properties of light amplification and scattering in random gain media for the first time, and proposed the phenomenon of laser radiation in random gain media. The principle of a random laser is shown in Figure 1. In 1994, Lawandy et al. from Brown University in the United States used a laser beam to pump a dye solution doped with TiO2 with an Al2 O3 shell, and observed the laser multi-mode resonance phenomenon of the system experimentally, thus verifying the randomness proposed by Letokhov. The theory of random lasing phenomenon in the gain medium, which is the earliest random laser. Therefore, the resonant cavity of the random laser is a plurality of scattering particles, rather than a traditional mirror.
近年来，随机激光已经成为国际激光学界的热门研究领域。随机激光器因而无需外加谐振腔，具有稳定性好、体积小、价格低廉等优点，在显示、照明、医疗、探测、存储等诸多方面有着广泛的应用前景。In recent years, random lasers have become a hot research field in the international laser community. Therefore, random lasers do not require an external resonator, and have the advantages of good stability, small size, and low price. They have broad application prospects in display, lighting, medical treatment, detection, storage, and many other aspects.
多波长输出的激光器是在光电子技术中有着广泛的应用，因此如何提供一种便捷、快速调谐波长的随机激光器，是目前的研究热点之一。Lasers with multi-wavelength output are widely used in optoelectronic technology, so how to provide a convenient and fast wavelength-tunable random laser is one of the current research hotspots.
发明内容Contents of the invention
本发明的目的正是基于上述考虑，提出了一种通过机械拉伸方法调谐输出波长的随机激光器，该激光器具有方便快捷调谐波长的特点。Based on the above considerations, the purpose of the present invention is to propose a random laser whose output wavelength is tuned by a mechanical stretching method. The laser has the characteristics of convenient and quick wavelength tuning.
为实现上述目的，本发明采用的技术方案为一种拉伸法调谐波长的随机激光器，该激光器包括柔性基底硅胶片2.1、固化后的聚二甲基硅氧烷薄层2.2、银纳米线2.3和罗丹明2.4；所述银纳米线2.3和罗丹明2.4分散在固化后的聚二甲基硅氧烷薄层2.2中，所述固化后的聚二甲基硅氧烷薄层2.2覆盖在柔性基底硅胶片2.1上。In order to achieve the above-mentioned purpose, the technical solution adopted in the present invention is a random laser with a stretching method to tune the wavelength. The laser includes a flexible substrate silica gel sheet 2.1, a cured polydimethylsiloxane thin layer 2.2, and silver nanowires 2.3 and rhodamine 2.4; the silver nanowires 2.3 and rhodamine 2.4 are dispersed in the cured polydimethylsiloxane thin layer 2.2, and the cured polydimethylsiloxane thin layer 2.2 is covered on a flexible Base on silica gel sheet 2.1.
所述罗丹明2.4为R6G。The rhodamine 2.4 is R6G.
所述银纳米线2.3平均长度约10um，平均直径约70nm。The silver nanowires 2.3 have an average length of about 10um and an average diameter of about 70nm.
与现有技术相比，本发明具有如下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
1.采用银纳米线做为散射颗粒的同时，其表面会形成局域表面等离激元共振增强现象，进一步增强随机激光。1. When silver nanowires are used as scattering particles, localized surface plasmon resonance enhancement phenomenon will be formed on the surface to further enhance the random laser.
2.采用机械拉伸的方式，实现了随机激光器输出波长的调谐，具有快速、便捷的特点。2. The tuning of the output wavelength of the random laser is realized by means of mechanical stretching, which is fast and convenient.
附图说明Description of drawings
图1是随机激光的产生原理图；Figure 1 is a schematic diagram of random laser generation;
图2是本发明中固体随机激光器结构示意图。Fig. 2 is a schematic diagram of the structure of the solid random laser in the present invention.
图3是本发明中的随机激光器的光路图。Fig. 3 is an optical path diagram of the random laser in the present invention.
图4是本发明中的随机激光器的输出波长和拉伸量的关系。Fig. 4 is the relationship between the output wavelength and stretching amount of the random laser in the present invention.
图中，1.1、入射光，1.2、出射光，1.3、随机激光器，2.1、柔性基底硅胶片，2.2、固化后的聚二甲基硅氧烷薄层，2.3、银纳米线，2.4、罗丹明，3.1、泵浦激光器，3.2、发射激光，3.3、柔性固体激光器，3.4、光谱仪探头。In the figure, 1.1, incident light, 1.2, outgoing light, 1.3, random laser, 2.1, flexible substrate silicone film, 2.2, cured polydimethylsiloxane thin layer, 2.3, silver nanowires, 2.4, rhodamine , 3.1, pumping laser, 3.2, emitting laser, 3.3, flexible solid-state laser, 3.4, spectrometer probe.
具体实施方式Detailed ways
本发明在液态聚二甲基硅氧烷中分散罗丹明2.4和银纳米线2.3，并将混合物涂覆到硅胶片上，待聚二甲基硅氧烷固化成薄层后，便形成了柔性固体激光器3.3。罗丹明2.4作为激光增益介质的染料，银纳米线2.3充当散射颗粒和等离子激元反馈物质。如图3所示，当外界激光源泵浦激光器3.1以发射激光3.2作为泵浦光，照射到所述柔性固体激光器3.3时，罗丹明2.4分子吸收泵浦光能量，发出荧光，银纳米线2.3无序结构提供散射和反馈,从而获得随机激光输出，随机激光的输出可以用光谱仪光纤探头3.4接收。The present invention disperses rhodamine 2.4 and silver nanowire 2.3 in liquid polydimethylsiloxane, and coats the mixture on a silica gel sheet, and after the polydimethylsiloxane solidifies into a thin layer, a flexible solid is formed Lasers 3.3. Rhodamine 2.4 is used as the dye of the laser gain medium, and silver nanowires 2.3 are used as scattering particles and plasmonic feedback substances. As shown in Figure 3, when the external laser source pump laser 3.1 emits laser light 3.2 as the pump light and irradiates the flexible solid-state laser 3.3, the rhodamine 2.4 molecule absorbs the energy of the pump light and emits fluorescence, and the silver nanowire 2.3 The disordered structure provides scattering and feedback, thereby obtaining random laser output, which can be received by a spectrometer fiber optic probe 3.4.
当采用机械拉伸的方法拉伸本发明中的固体激光器样品时，原本无序排列银纳米线2.3，沿着样品的拉伸方向形成部分取向，在样品内部形成新的散射分布，从而产生新的随机激光的输出波长，并且随着拉伸量的增加，随机激光的波长发生蓝移现象，见图4.When the solid-state laser sample in the present invention is stretched by mechanical stretching, the original disordered arrangement of silver nanowires 2.3 forms partial orientation along the stretching direction of the sample, forming a new scattering distribution inside the sample, thereby generating a new The output wavelength of the random laser, and with the increase of the stretching amount, the wavelength of the random laser is blue-shifted, as shown in Figure 4.
本发明提供了一种拉伸法调谐波长的随机激光器，包括作为激光增益介质的染料，提供散射和等离子激元反馈的银纳米线，分散染料分子和银纳米线的柔性高分子材料和提供支撑作用的柔性基底。The invention provides a random laser with stretching method to tune the wavelength, including dyes as laser gain medium, silver nanowires for scattering and plasmon feedback, flexible polymer materials for dispersing dye molecules and silver nanowires and providing supports Functional flexible substrate.
聚二甲基硅氧烷(PDMS)是一种高分子有机硅化合物，具有稳定、光学透明的特点。聚二甲基硅氧烷(PDMS)在加入固化剂之前会保持一种流体状态，加热或长时间放置均不发生固化；按质量比10:1加入固化剂后，室温下固化时间约为8小时。固化后的聚二甲基硅氧烷(PDMS)具有高透光率和良好的柔性和韧性的特点。Polydimethylsiloxane (PDMS) is a high-molecular organosilicon compound that is stable and optically transparent. Polydimethylsiloxane (PDMS) will maintain a fluid state before adding the curing agent, and will not cure when heated or placed for a long time; after adding the curing agent at a mass ratio of 10:1, the curing time at room temperature is about 8 Hour. The cured polydimethylsiloxane (PDMS) has the characteristics of high light transmittance and good flexibility and toughness.
下面结合附图具体说明本发明的实施方法。The implementation method of the present invention will be described in detail below in conjunction with the accompanying drawings.
一种拉伸法调谐波长的随机激光器的制作方法，包括以下步骤：A method for fabricating a random laser tuned by a stretching method, comprising the following steps:
(1)将3mg罗丹明(R6G)加入1ml乙醇中，配制成3mg/ml的罗丹明(R6G)溶液；将浓度为0.033mol/L的银纳米线(AgNWs)乙醇分散液，取出100ul与所述罗丹明(R6G)乙醇溶液混和；取出1g液态聚二甲基硅氧烷(PDMS)，按照质量比10：1和固化剂混和，用超声波振荡的方法混和均匀；(1) Add 3 mg of rhodamine (R6G) into 1 ml of ethanol to prepare a 3 mg/ml rhodamine (R6G) solution; take out 100 ul of the silver nanowire (AgNWs) ethanol dispersion with a concentration of 0.033 mol/L Mix rhodamine (R6G) ethanol solution; take out 1g of liquid polydimethylsiloxane (PDMS), mix it with curing agent according to the mass ratio of 10:1, and mix evenly by ultrasonic oscillation;
(2)将所述罗丹明(R6G)乙醇溶液和银纳米线(AgNWs)的乙醇分散液，与所述聚二甲基硅氧烷(PDMS)混和，搅拌均匀后的混合液体，放在压强为10-1Pa的真空箱中静置1.5小时，去除混合液体中的空气和乙醇；形成混合有罗丹明(R6G)和银纳米线(AgNWs)的聚二甲基硅氧烷PDMS粘稠状液体；(2) Mix the rhodamine (R6G) ethanol solution and the ethanol dispersion of silver nanowires (AgNWs) with the polydimethylsiloxane (PDMS), stir the mixed liquid evenly, and place it under pressure Stand in a vacuum box at 10-1 Pa for 1.5 hours to remove the air and ethanol in the mixed liquid; form a viscous polydimethylsiloxane PDMS mixed with rhodamine (R6G) and silver nanowires (AgNWs) liquid;
(3)选择片状硅胶作为柔性基底(长宽分别为20mm，厚度1mm)，将混有罗丹明(R6G)和银纳米线(AgNWs)的聚二甲基硅氧烷(PDMS)粘稠状液体旋涂成约100um厚的薄层，80℃温度加热30分钟，使得混有罗丹明(R6G)和银纳米线(AgNWs)的聚二甲基硅氧烷(PDMS)完全固化；或者在室温下静置8小时，使得含有罗丹明(R6G)和银纳米线(AgNWs)的聚二甲基硅氧烷(PDMS)完全固化，在硅胶片基底上形成薄层；最终形成固体样品，其结构剖面示意图见图2；(3) Choose sheet-like silica gel as the flexible substrate (the length and width are 20 mm and the thickness is 1 mm), and polydimethylsiloxane (PDMS) mixed with rhodamine (R6G) and silver nanowires (AgNWs) is viscous The liquid is spin-coated into a thin layer about 100um thick, heated at 80°C for 30 minutes, so that the polydimethylsiloxane (PDMS) mixed with rhodamine (R6G) and silver nanowires (AgNWs) is completely cured; or at room temperature Let it stand for 8 hours, so that the polydimethylsiloxane (PDMS) containing rhodamine (R6G) and silver nanowires (AgNWs) is completely cured, and a thin layer is formed on the silica gel substrate; finally a solid sample is formed, and its structure The cross-sectional schematic diagram is shown in Figure 2;
(4)如图3，泵浦激光器，优选脉冲YAG激光器532nm光(脉宽为10ns，泵浦频率为10Hz)作为泵浦光照射固体样品；(4) As shown in Figure 3, the pump laser, preferably pulsed YAG laser 532nm light (pulse width is 10ns, pump frequency is 10Hz) is used as pump light to irradiate the solid sample;
(5)通过机械拉伸方式将样品拉伸不同比例的伸长量，实现输出随机激光波长的调谐，随机激光器的输出波长和拉伸量的关系见图4。(5) Stretch the sample by different proportions of elongation by mechanical stretching to realize the tuning of the output random laser wavelength. The relationship between the output wavelength of the random laser and the stretching amount is shown in Figure 4.
本发明提供了一种拉伸法调谐波长的随机激光器，以上显示和描述了本发明的基本原理和主要制作方法。The present invention provides a random laser with stretching method to tune the wavelength. The above shows and describes the basic principle and main manufacturing method of the present invention.
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| CN201410838289.4ACN104538828B (en) | 2014-12-29 | 2014-12-29 | A kind of solid accidental laser of pulling method tuning wavelength |
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| CN201410838289.4ACN104538828B (en) | 2014-12-29 | 2014-12-29 | A kind of solid accidental laser of pulling method tuning wavelength |
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| CN104538828Atrue CN104538828A (en) | 2015-04-22 |
| CN104538828B CN104538828B (en) | 2017-12-15 |
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| CN201410838289.4AActiveCN104538828B (en) | 2014-12-29 | 2014-12-29 | A kind of solid accidental laser of pulling method tuning wavelength |
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