Author Affiliations
Abstract
School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China
A single output Q-switched Nd:GdVO4 laser with a reflective graphene oxide (GO) saturable absorber was demonstrated. The shortest pulse duration in the Q-switched laser is 115 ns, and the output power ranges from 1.23 W at 1.71 MHz to 2.11 W at 2.50 MHz when the pump power rises from 7.40 to 10.90 W with the utilization of GO Langmuir–Blodgett (LB) films based on the convenient and low-cost LB technique. To the best of our knowledge, it is the highest output power in a Q-switched laser with a GO saturable absorber.
140.3540 Lasers, Q-switched 140.3580 Lasers, solid-state Chinese Optics Letters
2019, 17(2): 020009
陕西师范大学 物理学与信息技术学院, 陕西 西安 710119
利用WS2的可饱和吸收特性, 在激光二极管侧面抽运Nd∶YAG固体激光器Z型腔结构中分别实现了被动调Q和被动调Q锁模运转。实验表明: 当泵浦电流为9.5 A时, 开始启动调Q运转, 当泵浦电流大于9.8 A时, 调Q激光脉冲趋于稳定。当泵浦电流为12.8 A时, 被动调Q输出的最大平均功率为466 mW, 最窄脉冲宽度为3.205 μs, 对应的重复频率为71.70 kHz, 此时最大单脉冲能量为6.5 μJ。当泵浦电流达到13.4 A时, 激光器实现调Q锁模运转。调Q锁模的最高输出功率为590 mW, 调Q包络频率为71.98 kHz, 单个调Q包络内的脉冲串重复频率123.1 MHz, 每个调Q包络中包含369个脉冲, 单脉冲能量为22.2 nJ。结果表明WS2材料可以作为可饱和吸收体用于固体激光器中。
WS2可饱和吸收体 Nd∶YAG激光器 被动调Q锁模 WS2 saturable absorber Nd∶YAG lasers passive Q-switched mode locking
Author Affiliations
Abstract
1 Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
2 Institute of Data Science and Technology, Shandong Normal University, Jinan 250014, China
3 School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China
A diode-pumped Tm:YLF passively Q-switched laser at 2 μm was first demonstrated by using graphene oxide (GO) as a saturable absorber (SA). In this letter, continuous-wave (CW) laser and pulse laser performances were studied meticulously and systematically. It reasonably showed the dependence of the pulse duration, pulse energy, and pulse repetition rate on the absorbed power. A maximum repetition rate of 38.33 kHz and a single pulse energy of 9.89 μJ were obtained.
140.3380 Laser materials 140.3480 Lasers, diode-pumped 140.3540 Lasers, Q-switched Chinese Optics Letters
2018, 16(2): 020013
1 天水师范学院激光技术研究所, 甘肃 天水 741001
2 陕西师范大学物理学与信息技术学院, 陕西 西安 710062
结合特殊设计的低阈值五镜折叠腔,利用垂直生长法自制的双壁碳纳米管,并将其作为可饱和吸收体在Tm,Ho∶LLF激光器中实现了连续锁模运转。在连续激光运转下,吸收抽运阈值低至59 mW,光-光转化效率为30.09%。在腔内插入饱和吸收体后,吸收抽运阈值提高至107 mW。当吸收抽运功率大于1562 mW时,激光运转进入稳定的连续锁模状态,对应锁模脉冲的重复频率为100 MHz,脉冲宽度约为515 ps;当吸收抽运功率达到2 W时,最高输出功率为234 mW,中心波长为1895 nm,对应最大单脉冲能量为2.34 nJ。
激光器 低阈值谐振腔 双壁碳纳米管 连续锁模
1 天水师范学院激光技术研究所, 甘肃 天水 741001
2 陕西师范大学物理学与信息技术学院， 陕西 西安 710062
利用垂直生长法制备的氧化石墨烯(GO)作为可饱和吸收体，结合特殊设计的低阈值谐振腔，在Tm,Ho∶LiLuF4全固态激光器中实现了低阈值被动调Q锁模运转。出光阈值功率低至73 mW，稳定锁模阈值功率为663 mW，对应GO可饱和吸收体上功率密度为76.4 μJ·cm-2。典型的调Q脉冲包络重复频率为104.2 kHz，脉宽约为30 μs，包络下锁模脉冲序列的重复频率为178.6 MHz，调制深度接近100%。
激光器 低阈值 Ho∶LiLuF4激光器 氧化石墨烯 调Q锁模 可饱和吸收体
1 宝鸡文理学院 物理与光电技术学院, 陕西 宝鸡 721016
2 宝鸡市超快光学与新材料工程技术研究中心, 陕西 宝鸡 721016
3 中国科学院西安光学精密机械研究所 瞬态光学与光子技术国家重点实验室, 西安 710119
基于800 nm飞秒激光脉冲对标准单模光纤采用非载氢技术刻写长周期光纤光栅的机理进行了研究.搭建了水平、垂直双CCD视频监控的飞秒激光脉冲逐点刻蚀长周期光纤光栅系统, 研究了光栅长度、激光脉冲能量和光栅占空比等参数对光栅光谱特性的影响.研究结果表明, 当光栅周期长度不变, 光栅周期数和激光脉冲能量的变化使光栅谐振峰强度发生变化, 光栅透射谱是单峰的; 光栅占空比的改变导致光栅谐振峰由单峰转变为多峰.在谐振波长1 540 nm处, 得带谐振峰强度达到15 dB、带外损耗不足2 dB, 在3 dB衰减处带宽为15 nm的谐振透射谱.
长周期光纤光栅 飞秒激光 超快微加工 耦合模 峰值损耗 Long-Period Fiber Grating (LPFG) Infrared femtosecond laser Ultrafast micro processes in fibers Coupled mode Peak loss
Author Affiliations
Abstract
1 State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Physics and information Technology, Shaanxi Normal University, Xi’an 710119, China
A novel black phosphorus (BP) solution saturable absorber (SA) is fabricated by the liquid-phase-exfoliated method and successfully used for passively Q-switched (QS) Nd:YVO4 laser. Compared with a traditional solid SA, a BP solution SA possesses more excellent optical transparency and higher damage resistance. The shortest pulse duration and highest average output power are measured to be 119 ns and 1.23 W, respectively. To the best of our knowledge, both of them are the best results among QS solid-state lasers with BP-based absorbers so far. The repetition rate is in the range of 533.2 to 722 kHz. The results indicate the potential application of the BP solution SA into high-power solid-state pulse lasers.
140.3540 Lasers, Q-switched 140.3580 Lasers, solid-state 160.4330 Nonlinear optical materials Chinese Optics Letters
2017, 15(1): 011402
Author Affiliations
Abstract
1 State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China
Graphene oxide carboxylic acid (COOH), a novel two-dimensional (2D) layered material with its unique optical and electronic properties, is discovered to exhibit the saturation of optical absorption under laser illumination. Applying the liquid-phase exfoliation method, we prepare graphene oxide-COOH dispersions with deionized water and fabricate graphene oxide-COOH polyvinyl alcohol polymer composite film. We further obtain stable Q-switching pulse and mode-locked laser operation with a 22.7 MHz repetition rate and a 1.5 ps pulse duration by incorporating the graphene oxide-COOH-based saturable absorbers into the all-fiber erbium-doped fiber laser cavity. The experimental results show that the proposed graphene oxide-COOH material can act as an effective absorber for pulsed fiber lasers, which demonstrate potential applications in the area of ultrafast optics.
140.4050 Mode-locked lasers 140.3510 Lasers, fiber 140.3540 Lasers, Q-switched Chinese Optics Letters
2017, 15(10): 101402
1 天水师范学院激光技术研究所, 甘肃 天水 741000
2 陕西师范大学物理学与信息技术学院, 陕西 西安 710062
利用二维过渡金属材料WS2作为2 μm波段可饱和吸收体, 采用典型的X型四镜腔结构, 实现了Tm,Ho∶LuLiF4激光器低阈值被动调Q运转。实验结果表明, 吸收功率为260 mW时开始启动调Q运转, 吸收抽运功率大于650 mW时, 调Q激光脉冲进入稳定运转。抽运功率为2000 mW时, 在中心波长1895 nm波段输出功率为88 mW, 典型脉冲宽度为4 μs, 重复频率为16.89 kHz, 对应最大单脉冲能量为5.21 μJ。结果表明, WS2材料可以作为2 μm固体激光器的可饱和吸收体。
激光技术 WS2可饱和吸收体 被动调Q激光器 Ho∶LuLiF4激光器 低阈值激光器
中科院西安光学精密机械研究所 瞬态光学与光子技术国家重点实验室, 西安 710119
利用半导体可饱和吸收镜锁模技术, 在半导体激光侧面抽运Nd∶YAG晶体固体激光器Z型腔结构中实现了连续锁模运转, 获得输出功率356 mW、重复频率101 MHz、单脉冲能量3.49 nJ、脉冲宽度23.4 ps和中心波长1 064 nm的皮秒锁模激光输出, 测得光束质量M2因子约1.2.为了提升锁模脉冲的平均单脉冲能量, 实验研究了声光调Q开关与半导体可饱和吸收镜同时作用的调Q锁模激光器, 在提高锁模脉冲稳定性的同时, 将锁模平均单脉冲能量提高到406 nJ, 为连续锁模脉冲的116倍.
固体激光器 被动锁模 调Q锁模 半导体可饱和吸收镜 声光调Q开关 Solid state laser Passive mode-locked Q-switched and mode-locked Semiconductor Saturable Absorption Mirror(SESAM) Acousto-optic Q-switch Nd∶YAG Nd∶YAG
