2.05μm掺铥光纤激光器研究
发布时间：2018-12-14 01:53
【摘要】：近年来,工作在人眼安全波段2μm波段的掺铥光纤激光器得到广泛关注。其中2.05μm的激光位于大气窗口,在大气遥感,激光通讯领域有较大的应用前景。另外,该波长位于ZGP(ZnGeP2)晶体的低吸收波段,所以在中红外光学参量振荡器中也有着广泛应用。本文主要开展了2.05μm波段高功率掺铥光纤激光器的研究,利用锁模、声光调制、增益开关等方法得到ps及ns级的种子源,并利用主振荡功率放大系统分别获得了高功率的ps、ns脉冲输出和单频连续及脉冲输出。论文的主要内容包括:1、介绍了2.05μm光纤激光器的研究背景,根据输出特性的不同,分别综述了连续激光、超短脉冲、纳秒脉冲输出的光纤激光器的研究现状。2、设计并实现了全光纤结构2050 nm高功率单频连续及脉冲激光输出的掺铥光纤激光器(TDFL)。使用分布式反馈(DFB)激光器作为整个系统的种子源,直接放大可以获得最高75 W的单频连续光输出。对DFB放大后再用声光调制器(AOM)进行调制可以获得重复频率脉宽均可调谐的单频脉冲。以此为种子源经过放大后,最高可以获得峰值功率大于0.6 kW的脉冲输出,接近受激布里渊散射(SBS)阈值。3、设计并实现了全光纤结构2050 nm高峰值功率皮秒脉冲TDFL。自行搭建基于半导体饱和吸收镜(SESAM)的锁模激光器作为种子源,输出脉宽约31.9 ps,重复频率13.68 MHz。经过主振荡功率放大(MOPA)系统的两级放大器,平均功率被提升至23.5 W,对应峰值功率约为54 kW。4、设计并实现了全光纤结构2050 nm高能量纳秒脉冲TDFL。实验中采用增益开关技术搭建种子激光器,利用1550 nm脉冲激光做为泵浦源,直接获得重复频率可调、脉冲宽度可控的纳秒脉冲输出。通过MOPA系统对纳秒脉冲进行放大,并对放大器进行细节上的优化,首次在全光纤结构中实现单个脉冲能量1 mJ,峰值功率10 kW的纳秒脉冲输出。实验中还研究了不同重复频率的1550 nm激光泵浦时,增益开关激光器的输出特性。结果表明,泵浦光重复频率越高,激光器的平均功率阈值越高,且输出脉冲宽度越窄。
[Abstract]:In recent years, thulium doped fiber lasers working in the 2 渭 m band of human eye safety have received wide attention. The 2.05 渭 m laser is located in the atmospheric window, which has a great application prospect in the field of atmospheric remote sensing and laser communication. In addition, the wavelength is located in the low absorption band of ZGP (ZnGeP2) crystal, so it is widely used in the middle infrared optical parametric oscillator. In this paper, the research of 2.05 渭 m high power thulium doped fiber laser is carried out. The seed sources of ps and ns are obtained by mode-locking, acousto-optic modulation and gain switch, respectively, and the high power ps, is obtained by using the main oscillatory power amplifier system. Ns pulse output and single frequency continuous and pulse output. The main contents of this paper are as follows: 1. The research background of 2.05 渭 m fiber laser is introduced. According to the different output characteristics, the research status of fiber laser with continuous laser, ultrashort pulse and nanosecond pulse is summarized respectively. An all-fiber structure 2050 nm high power single frequency CW and pulse laser output thulium doped fiber laser (TDFL). Is designed and implemented. The distributed feedback (DFB) laser is used as the seed source of the whole system, and the single frequency CW output of 75 W can be obtained by direct amplification. The single frequency pulse with tunable pulse width can be obtained by modulating the DFB with the acoustooptic modulator (AOM). When the seed source is amplified, the pulse output with peak power greater than 0.6 kW can be obtained, which is close to the stimulated Brillouin scattering (SBS) threshold. 3. An all-fiber structure of 2050 nm high peak power picosecond pulse TDFL. is designed and implemented. A mode-locked laser based on semiconductor saturable absorption mirror (SESAM) was built as seed source. The output pulse width is about 31.9 ps, repetition rate 13.68 MHz.. Through a two-stage amplifier of (MOPA) system with main oscillatory power amplifier, the average power is raised to 23.5 W, and the corresponding peak power is about 54 kW.4,. An all-fiber structure of 2050 nm high energy nanosecond pulse TDFL. is designed and realized. In the experiment, the gain switch technique is used to construct the seed laser, and the 1550 nm pulse laser is used as the pumping source. The nanosecond pulse output with adjustable repetition rate and controllable pulse width is obtained directly. The nanosecond pulse is amplified by the MOPA system, and the amplifier is optimized in detail. It is the first time to realize the nanosecond pulse output of a single pulse energy of 1 mJ, peak power of 10 kW in the all-fiber structure. The output characteristics of the gain-switched laser pumped by 1550 nm laser with different repetition rate are also studied. The results show that the higher the pump repetition rate, the higher the average power threshold and the narrower the output pulse width.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
本文编号：2377690
[Abstract]:In recent years, thulium doped fiber lasers working in the 2 渭 m band of human eye safety have received wide attention. The 2.05 渭 m laser is located in the atmospheric window, which has a great application prospect in the field of atmospheric remote sensing and laser communication. In addition, the wavelength is located in the low absorption band of ZGP (ZnGeP2) crystal, so it is widely used in the middle infrared optical parametric oscillator. In this paper, the research of 2.05 渭 m high power thulium doped fiber laser is carried out. The seed sources of ps and ns are obtained by mode-locking, acousto-optic modulation and gain switch, respectively, and the high power ps, is obtained by using the main oscillatory power amplifier system. Ns pulse output and single frequency continuous and pulse output. The main contents of this paper are as follows: 1. The research background of 2.05 渭 m fiber laser is introduced. According to the different output characteristics, the research status of fiber laser with continuous laser, ultrashort pulse and nanosecond pulse is summarized respectively. An all-fiber structure 2050 nm high power single frequency CW and pulse laser output thulium doped fiber laser (TDFL). Is designed and implemented. The distributed feedback (DFB) laser is used as the seed source of the whole system, and the single frequency CW output of 75 W can be obtained by direct amplification. The single frequency pulse with tunable pulse width can be obtained by modulating the DFB with the acoustooptic modulator (AOM). When the seed source is amplified, the pulse output with peak power greater than 0.6 kW can be obtained, which is close to the stimulated Brillouin scattering (SBS) threshold. 3. An all-fiber structure of 2050 nm high peak power picosecond pulse TDFL. is designed and implemented. A mode-locked laser based on semiconductor saturable absorption mirror (SESAM) was built as seed source. The output pulse width is about 31.9 ps, repetition rate 13.68 MHz.. Through a two-stage amplifier of (MOPA) system with main oscillatory power amplifier, the average power is raised to 23.5 W, and the corresponding peak power is about 54 kW.4,. An all-fiber structure of 2050 nm high energy nanosecond pulse TDFL. is designed and realized. In the experiment, the gain switch technique is used to construct the seed laser, and the 1550 nm pulse laser is used as the pumping source. The nanosecond pulse output with adjustable repetition rate and controllable pulse width is obtained directly. The nanosecond pulse is amplified by the MOPA system, and the amplifier is optimized in detail. It is the first time to realize the nanosecond pulse output of a single pulse energy of 1 mJ, peak power of 10 kW in the all-fiber structure. The output characteristics of the gain-switched laser pumped by 1550 nm laser with different repetition rate are also studied. The results show that the higher the pump repetition rate, the higher the average power threshold and the narrower the output pulse width.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
【参考文献】
相关期刊论文 前1条
1 韩隆;苑利钢;陈国;候天禹;魏磊;何利杰;王克强;;26W中波红外固体激光器[J];中国激光;2015年03期
，本文编号：2377690
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