Cr^(4+)∶YAG被动调Q纳秒脉冲包层抽运掺镱光纤激光器  

Cladding Pumped Nanosecond Passively Q-Switched Yb-Doped Fiber Laser with Cr^(4+)∶YAG as Saturable Absorber

作　　者：刘佳[1] 刘江[1] 王璞[1] 

机构地区：[1]北京工业大学激光工程研究院,北京100124

出　　处：《中国激光》2011年第11期8-13,共6页Chinese Journal of Lasers

基　　金：北京市自然科学基金重点项目(KZ2011100050011)资助课题

摘　　要：报道了Cr4+∶YAG晶体作为可饱和吸收体用于包层抽运掺镱光纤激光器被动调Q并得到稳定纳秒脉冲输出。采用环形腔和线形腔两种腔形,可有效抑制受激布里渊散射(SBS)的非线性效应,抑制自脉冲产生,从而得到稳定被动调Q脉冲输出。采用环形腔结构,得到稳定的1μs脉冲输出,时间抖动和振幅抖动均方根(RMS)值小于5%。线形腔中采用高反射率光纤布拉格光栅(FBG)作为输出腔镜,也实现稳定脉冲输出,重复频率9.1～30.3kHz可调谐,最窄脉宽156ns,远远小于国内报道的微秒量级脉冲宽度。虽然平均输出功率只有几百毫瓦,因采用光纤输出,此类脉冲激光器可作为种子源,进而与光纤放大器相匹配,经光纤放大器放大输出功率可达到几十瓦,从而满足实际工业应用需求。A cladding pumped passively Q-switched Yb-doped fiber laser with Cr4＋ .＇YAG saturable absorber is reported and stable nanosecond pulse trains is gotten. Two laser configurations of linear cavity and ring cavity are set up, and both of them can effectively restrain the generation of stimulated Brillouin scattering （SBS） and the generation of self-pulse. A ring cavity with Cr4＋ ：YAG inside the cavity to obtain stable 1 μs pulse trains is established. The amplitude fluctuation and timing jitter are below 5 % （RMS）. Further more, stable pulse trains by using a high reflective fiber Bragg grating （FBG） as a resonator mirror in a linear cavity is reached. The tunable pulse repetition rate is from 9.1 kHz to 30.3 kHz and the minimum pulse duration is 156 ns which is much less than microsecond pulses reported before. Although the average output power is only hundreds milli-watts now, it is convinient to boost the power with a stage of fiber amplifier because the laser uses a fiber coupler as the output of pulse trains. This kind of pulse laser can be used as a seed source and amplified to tens of watts for practical applications in the future.

关 键 词：激光器 光纤激光器 被动调Q Cr4+∶YAG晶体 纳秒脉冲 时间抖动 

分 类 号：TN248.1[电子电信—物理电子学]