Author Affiliations
Abstract
Department of Precision Instruments, Tsinghua University, Beijing 100084, China
We report a wavelength swept fiber laser at the 1 μm region based on an actively mode-locked dispersion-tuning technique. The ring-cavity laser uses a 70 cm ytterbium-doped fiber as a gain medium. Mode locking is achieved by the direct modulation of the amplitude modulator, and a ～1000 m single-mode fiber is used to provide the desired intracavity dispersion. By sine-modulating the modulation frequency, a wavelength swept laser with a range of ～30 nm can be achieved at a sweeping rate of 50 Hz. The characteristics of the laser, such as its single-wavelength tuning range, tuning sensitivity, static linewidth and sweeping rate, are also studied experimentally.
140.3510 Lasers, fiber 140.3600 Lasers, tunable 140.3615 Lasers, ytterbium Chinese Optics Letters
2015, 13(9): 091403
清华大学精密仪器与机械学系，精密测试技术与仪器国家重点实验室, 北京 100084
报道了一种基于色散调谐技术的宽带扫频掺铒光纤激光器。通过在主动锁模光纤激光器腔内引入较大色散，利用锯齿波电信号调制电光调制器的调制频率，可以实现激光器扫频输出。应用扫频激光器可将光纤光栅反射中心波长的变化转变为时域上信号间隔变化，适用于光纤光栅传感解调。搭建了扫频光纤激光器，利用掺铒光纤作为增益介质，研究了扫频范围的影响因素。通过优化实验参数，实验得到的扫频带宽达到43 nm，接近增益带宽，扫频速度为50 Hz。利用搭建的扫频激光器进行了光纤光栅传感解调，灵敏度约为0.68 ms/nm，验证了解调原理。
激光技术 扫频激光器 色散调谐 光纤光栅传感 时域解调 光学学报
2012, 32(11): 1114003
