Organic waveguide laser by a surface-relief holographic grating formed by photoisomerization

光致异构化形成的表面浮雕全息光栅有机波导激光器

基本信息

批准号：
16560031
负责人：
OMATSU Takashige
金额：
$ 2.3万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560031/
关键词：
Organic Laser Waveguide photoisomerization

项目摘要

Diffraction gratings have been important elements in integrated optics for many applications such as spectral filtering, optical feedback, and coupling light into and out of optical waveguides. Recently, several re-searchers have reported that a light-induced surface relief hologram can be formed on azo-benzene containing polymers by trans-cis photoisomerization in a one step process at room temperature. This method involves exposing the polymer to a simple two- beam interference pattern, and can allow quick fabrication of large area gratings having small periods, with good control over the grating parameters.In this research, we present a laser oscillation of a poly-mer waveguide with distributed feedback based on a light-induced surface relief hologram.The polymer thin-film fabricated by spin-coating technique was composed of azo-benzene containing polymer Poly-Orange-Tom-1 film. Its thickness was approximately 1 μm. Distributed-feedback gratings (DFB gratings) based on surface relie … More f hologram were formed by the interferential irradiation system.A diode-pumped, continuous-wave Nd:YAG green laser used for a recording light source was collimated, and passed through the film. Its intensity on the film was 100mW/cm^2. The polarization of the recording laser was perpendicular to the grating vector of the relief hologram. The film and the tuning mirror were fixed on the rotational mount. And the grating period formed on the film was controlled by varying a rotational angle of the mount. The holographic recording was typically conducted for 2000s at any grating periods. After 2000s, the diffraction efficiency almost reached up to the maximum level. And then, a height of the relief gratings was 〜25 nm with a period of 370 nm. A height of the relief gratings was 〜60 nm with a period of 550 nm.In order to fabricate the waveguide laser, a laser dye (DCM) doped PVK film was over-coated onto the azo-benzene polymer film with DFB gratings by the spin-coating technique. This device was pumped by a mode-locked Q-switched di-ode-pumped Nd:YAG green laser (λ=532 nm) with a pulse duration of 20ps at a repetition rate of 10 Hz. The device with the grating period of 370nm lased at 630nm, and then, the lasing threshold was 20mJ/cm^2. Less

对于许多应用，衍射光栅一直是诸如光谱滤波，光学反馈和耦合光进入和从光学波导中的耦合光的重要元素。最近，一些重新搜索者报告说，可以在室温下在一个步骤中通过反式cis光异构化在含有聚合物的偶氮 - 苯苄烯上形成光诱导的表面浮雕全息图。该方法涉及将聚合物暴露于简单的两光束干扰模式中，并可以快速制造具有少量时期的大面积，并对光栅参数进行了良好的控制。在这项研究中，我们提出了基于光诱导的薄膜塑料的分布式反馈的多晶状体振荡，并呈现了带有分布式反馈的polymer。包含聚合物聚橙-TOM-1膜。约1μm。基于表面填充的分布式反馈光栅（DFB光栅）……由干扰辐照系统形成更多的全息图。二极管泵浦，连续的波 - 波：yag绿色激光用于录音光源，并通过了电影。它在胶片上的强度为100MW/cm^2。记录激光的极化垂直于浮雕全息图的光向载体。胶片和调音镜固定在旋转架上。通过改变座的旋转角度来控制膜上形成的光栅周期。全息记录通常在任何光栅期间进行2000年代。 2000年代后，衍射效率几乎达到了最大水平。然后，浮雕光栅的高度约为25 nm，周期为370 nm。浮雕光栅的高度约为60 nm，为了制造波导激光的时间为550 nm。激光染料（DCM）掺杂的PVK膜被过度涂覆在偶氮苯苯聚合物膜上，并通过自旋涂层技术用DFB胶片。该设备是通过模式锁定的Q开关DI-ED-PUMP型ND：YAG绿色激光器（λ= 532 nm）的脉冲持续时间为20PS，重复速率为10 Hz。光栅周期为370nm的设备在630nm处为630nm，然后，激光阈值为20MJ/cm^2。较少的