Investigation on a colliding pulse mode-locking(Ce~(3 ),Nd~(3 )):YAG laser using an unstable resonator

An investigation on the characteristics of a passive colliding pulse mode-locking(Ce~(3 ),Nd~(3 )):YAG laser using an unstable resonator containing an antiresonant ring hasbeen completed.Using a Ф3×40mm active medium and the pentanethine cyanine dissolved in1,2-dichloethane as a saturable absorber,9 picosecond pulse-width and 3.2 mJ output energywere obtained.The optimum initial transmission of the absorbing cell was determined.     

An Experimental Study on the Output Properties of an Actively Mode-locked Er~(3 ) Doped Fiber Ring Laser

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Theory and Experiments of Active-Passive Colliding Pulse Mode-Locking in Solid-State Lasers

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LD端泵Nd:YAG SESAM锁模激光器的研究

本文分析了SESAM锁模与染料可饱和吸收体锁模的区别，提出了SESAM锁模机理的初步模型。根据对腔参数的分析结果，进行了一系列实验，实现了半导体端泵Nd:YAG激光器的SESAM锁模运转，这是首次利用直腔进行SESAM锁模，为进一步研究SESAM锁模奠定了基础。     

宽可调谐自起振被动锁模掺铒光纤激光器

分析了利用非线性偏振旋转效应作为等效可饱和吸收体锁模的原理,并用该方法构建起环形腔被动锁模掺铒光纤激光器,结合可调谐滤波器腔外滤波的方法实现锁模脉冲波长的连续可调谐.实验中得到自起振、平均输出功率0.313 mW,脉冲半极大全宽度(FWHM)1.5 ps,中心波长1562.3nm,重复频率13.9MHz的稳定被动锁模脉冲序列输出,滤波后输出脉冲中心波长在1553.2～1571.4 nm内连续可调,得到谱宽2.5 nm以下,脉宽小于1.8 ps的限变脉冲输出.     

亚皮秒自起振被动锁模掺铒光纤激光器

理论分析了利用非线性偏振旋转效应锁模激光器的机理。实验得到平均输出功率0．313mW、重复频率13．9MHz的自起振稳定被动锁模输出,中心波长1562．3nm,脉冲半极大全宽度(FWHM)1．5ps。利用孤子压缩效应,将输出脉冲压缩到750fs,并观察到高阶孤子的分裂现象。     

Multiwavelength Actively Mode-locked Fiber Laser with a Double-ring Configuration and Integrated Cascaded Sampled Fiber Bragg Gratings

A modified multiwavelength actively mode-locked fiber ring laser is proposed and experimentally demonstrated. In this kind of laser, stable multiwavelengths lasing is achieved by integrating cascaded sampled fiber Bragg gratings（SFBGs） into the laser cavity. To implement actively mode-locking technique, a doublering cavity configuration is used to assure that the cavity lengths for all wavelengths lasing are identical. Thus, simultaneous mode locking of all wavelengths has been successfully achieved by using the same mode-locking signal.     

同步抽运锁模的掺镱光纤激光器

同步抽运锁模是一种调制增益的锁模技术，就是调节抽运光的调制频率使之等于激光器纵模间隔的整数倍。通过对抽运光源半导体激光器的驱动电流进行正弦调制，实现了掺镱光纤激光器(YDFL)的同步抽运锁模。通过调整抽运激光器的调制频率，在相应于二次谐波锁模，4阶有理数谐波锁模条件下分别得到了较窄的脉冲输出。对重复频率625kHz的二次谐波锁模脉冲序列，脉冲宽度小于20ns，约为抽运光宽度的1／40；平均输出功率2．34mw，能量转换效率约为5％。     

基于石墨烯的被动锁模掺铒光纤孤子激光器

报道了石墨烯作为可饱和吸收体的被动锁模掺铒光纤孤子激光器。采用环形腔结构,在抽运功率为370.4mW时,产生了重复率为3.16MHz,脉宽约为1.32ps,平均输出功率为1.07mW的锁模脉冲,其单脉冲能量为0.338nJ,并观察到激光中心波长在1556.72～1558.76nm之间可调。基于Ginzburg-Landau方程进行了数值模拟,得到的结果和实验一致。     

双波长可切换飞秒锁模光纤激光器

报道了基于非线性偏振旋转技术的双波长可切换飞秒锁模光纤激光器.通过改变泵浦功率以及偏振控制器状态,激光器在波长1533.2 nm和1557.2 nm处可实现双波长锁模,两个波长的间隔为24 nm.在这两个波长之间还可实现可切换运作,对应的3 dB带宽分别为5.53 nm和4.69 nm,脉冲宽度分别为730 fs和89...