新型可见光—近红外超快光源研究

发布时间：2018-01-20 12:44

本文关键词： 掺镱正硅酸盐晶体全固态超短脉冲激光器双波长同步锁模同步泵浦的飞秒光参量振荡器高重频运转　出处：《西安电子科技大学》2016年博士论文　论文类型：学位论文

【摘要】：超短脉冲激光在科学前沿、先进制造、微纳加工、生物医疗、宽带通信以及军事等众多领域有着广泛的应用。针对不同的实际应用对不同波长的超短脉冲激光的需求,本文重点开展了可见光-近红外波段新型超快光源包括采用新型超快激光介质(掺镱正硅酸盐晶体)的全固态超短脉冲激光器以及同步泵浦的高功率飞秒光参量振荡器的实验研究。本人在博士期间的主要工作包括以下内容：1.针对两种晶体具有多峰的发射光谱特性,上首次实现了Yb:YSO/Yb:LSO振荡器的双波长同步锁模运转。采用3 mm长、掺杂5 at.%Yb3+的Yb:YSO晶体,同时获得了中心波长1059.2 nm和1081.2nm的双波长锁模脉冲,平均功率为164 mW。利用两个波长脉冲在时域上的拍频,产生了重频为1.4 THz、脉宽为169 fs的脉冲序列；利用3 nm长、掺杂5 at.%Yb34的Yb:LSO晶体,也获得了中心波长1060.3 nm和1084.2 nm的双波长同步锁模脉冲,得到了225 mW平均功率,两个不同波长的脉冲拍频产生的脉冲序列的重复频率和脉宽分别是0.85 THz和590 fs。此外,利用全正色散腔型结构,我们也首次观察到了Yb:YSO/Yb:LSO振荡器的耗散孤子锁模运转。2.首次实现了Yb:LYSO、Yb:GSO和Yb:LSO振荡器的飞秒克尔透镜锁模运转。通过合理的色散补偿,利用3 mm长、5 at.%掺杂的Yb:LYSO、Yb:GSO和Yb:LSO晶体,分别实现了61 fs、72fs和54fs的超短脉冲输出,比之前报道的SESAM被动锁模结果相应的缩短了10、5、5倍,实验结果证明了掺镱正硅酸盐晶体在超短脉冲产生方面巨大的潜力。此外,基于SESAM被动锁模的Yb:LYSO振荡器,我们分别在1035 nm和1042 nm中心波长获得了3W平均功率的稳定锁模脉冲,相应的脉冲宽度为297 fs和214 fs。亚百飞秒脉冲的产生以及稳定的高功率锁模运转证明掺镱正硅酸盐晶体是一种同时兼备高功率和窄脉宽输出能力的优质超快激光介质。3.利用自建的高功率SESAM锁模Yb:LYSO振荡器作为泵浦源,在国内首次实现了Yb全固态激光器泵浦的飞秒MgO:PPLN-OPO,获得了波长哎1428 nm-1763 nm范围连续可调谐的信号光脉冲,进一步通过腔内倍频,将近红外飞秒脉冲波长拓展到了768-874nm波段。4.利用2.5nm长的LBO晶体,对商用的Yb:KGW飞秒振荡器进行倍频得到了平均功率4.1 W的高光束质量飞秒绿光,倍频效率达57.5%。并首次实现了飞秒绿光泵浦的BIBO-OPO,得到了波长在660-1057 nm范围连续可调谐的可见光-近红外信号光脉冲,最大输出功率达1.1 W。经过腔外压缩后,信号光最窄脉宽为71 fs。同时我们还得到1150-1900 nm波长范围的空闲光脉冲,最大输出功率为414 mW,其相应的脉冲宽度在94-223 fs之间。5.利用飞秒绿光泵浦的LBO-OPO,得到了波长在660-1030 nm范围连续可调的信号光。信号光的最大输出功率达1.9 W,对应52.7%的光光转换效率,是迄今国际上同类研究所见报道的最高效率。6.首次利用谐频泵浦方式实现了高重频的绿光泵浦飞秒OPO运行。通过设计紧凑的环形腔结构,以飞秒绿光作为泵浦源,实现了755 MHz重复频率的飞秒BIBO-OPO运转,得到了平均功率为581 mW、脉冲宽度为166 fs的712 nm信号光。7.建成迄今国际上最高重频的飞秒OPO。采用线性腔结构,以高功率的Yb:KGW振荡器为泵浦源,得到了从7.7GHz-37.3GHz不同重复频率的飞秒MgO:PPLN-OPO运转,其信号光波长为通信波段的1515nm。其中37.3 GHz为目前己知的飞秒OPO的最高运转重复频率,此时的信号光输出功率为90mW,脉冲宽度为163 fs。
[Abstract]:Ultrashort pulse laser advanced at the forefront of science, manufacturing, biomedical, micro nano processing, broadband communication and military and other fields has been widely used. According to the different applications of ultrashort pulse laser with different wavelength requirements, this thesis focuses on the visible light and near infrared band light source includes a novel ultrafast using novel ultrafast laser medium (Yb3 + - doped silicate crystal is) solid-state ultrashort pulse laser and experimental study on high power femtosecond optical parametric oscillator synchronous pump. I work in during the doctoral period includes the following contents: 1. according to the emission spectrum of the two crystals have many peaks, for the first time to achieve a dual wavelength mode-locked oscillator synchronous Yb:YSO/Yb:LSO operation. By 3 mm long, Yb:YSO crystal doped with 5 at.%Yb3+, and obtain the center wavelength of 1059.2 nm and dual wavelength mode-locked pulses of 1081.2nm, average power For 164 mW. using two wavelength pulse in the time domain of the beat frequency, the frequency is 1.4 THz, pulse width is 169 FS sequence; using 3 nm long, Yb:LSO crystal doped with 5 at.%Yb34, also received a dual wavelength center wavelength of 1060.3 nm and 1084.2 nm synchronous mode-locked pulse, 225 mW the average power is obtained, two pulse sequence of beat frequency pulse generated by different wavelength repetition frequency and pulse width were 0.85 THz and 590 fs. in addition, use of all normal dispersion cavity type structure, we first observed the dissipative soliton mode-locked oscillator Yb:YSO/Yb:LSO.2. first Yb:LYSO, Yb:GSO and femtosecond Kerr lens Yb:LSO oscillator mode locking operation. Through the reasonable use of dispersion compensation, 3 mm long, 5 at.% doped Yb:LYSO, Yb:GSO and Yb:LSO crystals, there are 61 FS, 72fs and 54fs ultrashort pulse output, than previously reported passively mode-locked SESAM node If the corresponding shortened 10,5,5 times, experimental results show that the doped silicate crystals are produced great potential in ultrashort pulse. In addition, the Yb:LYSO oscillator based on SESAM passive mode locking, we are at 1035 nm and 1042 nm wavelength was 3W the average power of the pulses, the pulse width corresponding to 297 FS and 214 fs. sub hundred femtosecond pulse generation and stable high power mode-locked Yb3 + - doped silicate crystal is that is a high power quality SESAM ultrafast laser medium.3. a combination of both high power and narrow pulse width output capacity by using self mode-locked Yb:LYSO oscillator as the pump source, for the first time in China to achieve femtosecond MgO:PPLN-OPO Yb laser diode pumped solid-state laser, the signal wavelength is obtained 1428 nm-1763 nm well range tunable optical pulse, further by intracavity frequency doubling, near infrared femtosecond pulse wavelength extension To the development of 768-874nm band.4. by 2.5nm LBO long Yb:KGW crystal, the frequency of commercial femtosecond oscillator obtained high beam quality femtosecond laser with average power of 4.1 W green light, the frequency doubling efficiency reached 57.5%. and the first to achieve the green femtosecond pumped BIBO-OPO, the wavelength tunable continuous in the 660-1057 nm range of visible and near infrared the signal pulse, the maximum output power of 1.1 W. after extracavity compression, signal light with the pulse width of 71 fs. at the same time, we also get the 1150-1900 nm wavelength range of free light pulse, maximum output power is 414 mW, the pulse width and the corresponding in 94-223 between FS and.5. using femtosecond pump power of LBO-OPO, the the signal wavelength can be continuously adjusted in the range of 660-1030 nm. The maximum output power of the signal light is 1.9 W, corresponding to the 52.7% optical conversion efficiency, is so far the international similar Research Institute reported the highest The pump power of femtosecond OPO efficiency by.6. for the first time harmonic pump realizes high repetition frequency. Through ring cavity structure design is compact, with femtosecond green as the pump source, the femtosecond BIBO-OPO repetition rate of 755 MHz operation, the average power is 581 mW, the pulse width of 712 nm signal light.7. 166 FS built so far international highest repetition frequency femtosecond OPO. using linear cavity structure, with high power Yb:KGW oscillator as pump source, has been running from MgO:PPLN-OPO 7.7GHz-37.3GHz femtosecond laser with different repetition frequency, the signal wavelength for the communication band 1515nm. which is currently running 37.3 GHz highest known femtosecond OPO repetition frequency at the output signal power is 90mW, the pulse width of 163 fs.

【学位授予单位】：西安电子科技大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN248;TN752

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