785nm便携式光栅外腔可调谐半导体激光器的研制和输出特性

发布时间：2018-01-20 23:07

本文关键词： 便携式光栅外腔半导体激光器波长调谐电动调谐拉曼光谱　出处：《光谱学与光谱分析》2017年02期 　论文类型：期刊论文

【摘要】：针对移频激发拉曼光谱测试系统的小型化需求,在Littrow结构中,采用商用的785nm大功率激光二极管作为增益器件,构建了一款便携式光栅外腔可调谐半导体激光器。该激光器通过采用一种新型的波长调谐方法,即以改变半导体增益器件相对于准直透镜的水平位置来实现波长的连续调谐,实现了尺寸为140mm×65mm×50mm的小型化结构设计。相比于传统的旋转衍射光栅改变光线在光栅上的入射角来实现波长调谐的方式,该方法有效地缩减了增益器件的平移距离,从而有利于便携式外腔激光器波长的快速宽带调谐。实验结果表明,该激光器具有较宽的波长调谐范围,在340~900mA注入电流下均可实现10nm以上的波长调谐,尤其在900mA大注入电流下,其波长调谐覆盖779.40~791.07nm,调谐范围可达11.67nm,且激射线宽小于0.2nm,单波长输出功率最高可达280mW,放大的自发辐射抑制比大于25dB,呈现出较优异的输出性能,满足移频激发拉曼光谱检测系统对光源的基本要求。此外,该激光器可采用一微型压电陶瓷驱动器来实现波长的电动调谐,实验获得了1.35nm的波长调谐范围,证实了所制785nm便携式光栅外腔可调谐半导体激光器适合作为便携式移频激发拉曼光谱检测系统的光源用于减除原始拉曼光谱中的荧光背景。
[Abstract]:To meet the need of miniaturization of frequency-shifted excited Raman spectroscopy measurement system, a commercial 785 nm high power laser diode is used as gain device in Littrow structure. A portable grating external cavity tunable semiconductor laser is constructed by adopting a new wavelength tuning method. The continuous wavelength tuning is realized by changing the horizontal position of the semiconductor gain device relative to the collimating lens. The miniaturization structure design of 140mm 脳 65mm 脳 50mm is realized. Compared with the traditional rotating diffraction grating, the wavelength tuning is realized by changing the incident angle of light on the grating. This method can effectively reduce the translation distance of the gain device, which is beneficial to the fast broadband tuning of the wavelength of the portable external cavity laser. The experimental results show that the laser has a wide wavelength tuning range. Wavelength tuning can be achieved at more than 10nm at 340 Ma 900mA injection current, especially at 779.40mA 791.07nm, especially at 900mA large injection current. The tuning range is 11.67 nm, and the line width is less than 0.2 nm, the maximum output power of single wavelength is 280 MW, and the amplified spontaneous emission suppression ratio is more than 25 dB. The laser has excellent output performance and meets the basic requirements of the frequency-shifted excited Raman spectrum detection system. In addition, the laser can use a micro piezoelectric ceramic driver to realize the electric tuning of the wavelength. The wavelength tuning range of 1.35 nm has been obtained. It is proved that the tunable diode laser with 785 nm external cavity of grating is suitable to be used as the light source of the portable frequency-shifted excited Raman spectrum detection system to eliminate the fluorescence background in the original Raman spectrum.
【作者单位】：厦门大学萨本栋微米纳米科学技术研究院;厦门理工学院光电与通信工程学院;
【基金】：国家自然科学基金项目(61306087,21303143,61574119) 福建省自然科学基金计划项目(2013J05096)资助
【分类号】：TN248.4
【正文快照】： 移频激发法就是使用两束波长相近的激光分别激发样品得到引　言两组散射谱,由于荧光光谱不随波长的微小改变而发生移动,而拉曼信号却会发生明显偏移,所以在两组散射谱相减　　伴随着拉曼检测技术的不断成熟及其应用领域的迅速扩得到的差分光谱中,荧光的光谱信号几乎被完全消除

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