上海理工大学 光电信息与计算机工程学院, 上海 200093
针对激光切片技术缺少重频可调激光光源, 设计了一种脉冲平均功率35.4W, 脉宽12ps, 重复频率300kHz~1MHz可调的高功率掺镱光纤皮秒脉冲激光器。激光器采用全光纤振荡器及预放大系统, 配合基于棒状光子晶体光纤的主放大系统, 并通过在级联放大中加入声光调制器（AOM）调控重复频率, 从而实现重复频率可调的高功率皮秒脉冲输出。激光器振荡器及预放大部分的全光纤设计, 相较于空间耦合放大具有光路结构简单、环境稳定性高等特点, 有望推动高能量飞秒光纤激光工业化进程, 提升其在复杂使用环境的适应性。
光纤光学 超短脉冲 高功率激光 光子晶体光纤 棒状光纤 optical fiber1 ultrashort pulse2 high power laser3 photonic crystal fiber4 rod fiber5
上海理工大学光电信息与计算机工程学院，上海 200093
高重复频率光纤激光器因其光斑质量好、集成化程度高、光光转化率高等优势在光学频率梳、工业加工、超高速光学采样等领域有着举足轻重的作用。利用非线性偏振旋转（NPR）的锁模机理，设计并搭建了一款基础重复频率为163 MHz的“十字腔”型孤子锁模光纤飞秒激光器。该激光器锁模后在450 mW的泵浦功率下可以输出200 mW的最大功率，光谱半高宽为30 nm，输出脉宽为786 fs。通过进一步分析激光器泵浦功率与输出功率之间的关系，得到泵浦功率处于400～500 mW时，激光器处于最佳锁模状态，并且可以实现自启动锁模。所设计的激光器由于其更加紧密的光学频率梳齿、更好的成像质量和更快的成像速度，在精密光谱、天文探测等领域具有应用意义。
光纤激光器 非线性偏振旋转 高重复频率 fiber laser nonlinear polarization rotation high repetition frequency
Author Affiliations
Abstract
1 State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084
2 Optoelectronics Research Center, Department of Electronic Engineer, City University of Hong Kong, Hong Kong
A four-channel 400-GHz spacing flat focal field arrayed waveguide grating (AWG) demultiplexer is designed based on polymeric optical waveguide. The waveguide core-layer material is a newly developed negative tone epoxy Novolak resin (ENR) polymer with ultravoilet (UV) cured resin Norland optical adhesive 61 (NOA61) as the cladding layer. The device is fabricated using electron-beam direct writing, which has less processing steps than the reported polymeric AWGs. The experimental result is presented.
250.5460 polymer waveguides-fibers 060.1810 couplers switches and multiplexers 130.3120 integrated optics devices Chinese Optics Letters
2004, 2(6): 06362
Author Affiliations
Abstract
State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084
A novel integrated dense wavelength division multiplexing interleaver scheme is presented based on phased-array (PHASAR) wavelength demultiplexer with multimode interference (MMI) couplers. MMI-PHASAR interleaver with simple structure and compact size can realize narrow channel spacing through simple design procedure. And it is convenient for integration with integrated planar waveguide multiplexer/demultiplexers. A 25/50-GHz MMI-PHASAR interleaver is designed and the transmission characteristic is investigated by beam propagation method.
060.1810 couplers switches and multiplexers 130.3120 integrated optics devices Chinese Optics Letters
2004, 2(6): 06314
State Key Lab. of Precis. Measur. Technol. and Instrum., Dept. of Precis. Instrum., Tsinghua University, Beijing 100084, CHN
清华大学精密测试技术及仪器国家重点实验室, 北京 100084
提出了一种基于平板光学的新型DVD/CD-R兼容型集成光盘头。在此系统中, 光线沿着Ζ型在平板玻璃 基底中传播。通过集成的平板合分束器、消色差波片、分色光栅等器件完成双波长光束的合光、偏振态旋转、分光等 功能u经测试,此系统具有足够的能量利用率和集成度以及较小的体积和重量。
微光学 衍射光学 平板光学 集成光盘头
