2.1 $\unicode{x3bc}$ m, high-energy dissipative soliton resonance from a holmium-doped fiber laser system

IF 5.2 1区物理与天体物理 Q1 OPTICS

High Power Laser Science and Engineering Pub Date : 2023-01-17 DOI:10.1017/hpl.2023.3

D. Zhao, Bin Zhang, Xiran Zhu, Shuailin Liu, Li Jiang, Zhiyuan Dou, Linyong Yang, J. Hou

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引用次数: 0

Abstract

Abstract We propose a 2.1 μm high-energy dissipative soliton resonant (DSR) fiber laser system based on a mode-locked seed laser and dual-stage amplifiers. In the seed laser, the nonlinear amplifying loop mirror technique is employed to realize mode-locking. The utilization of an in-band pump scheme and long gain fiber enables effectively exciting 2.1 μm pulses. A section of ultra-high numerical aperture fiber (UHNAF) with normal dispersion and high nonlinearity and an output coupler with a large coupling ratio are used to achieve a high-energy DSR system. By optimizing the UHNAF length to 55 m, a 2103.7 nm, 88.1 nJ DSR laser with a 3-dB spectral bandwidth of 0.48 nm and a pulse width of 17.1 ns is obtained under a proper intracavity polarization state and pump power. The output power and conversion efficiency are 0.233 W and 4.57%, respectively, both an order of magnitude higher than those of previously reported holmium-doped DSR seed lasers. Thanks to the high output power and nanosecond pulse width of the seed laser, the average power of the DSR laser is linearly scaled up to 50.4 W via a dual-stage master oscillator power amplifier system. The 3-dB spectral bandwidth broadens slightly to 0.52 nm, and no distortion occurs in the amplified pulse waveform. The corresponding pulse energy reaches 19.1 μJ, which is the highest pulse energy in a holmium-doped mode-locked fiber laser system to the best of our knowledge. Such a 2.1 μm, high-energy DSR laser with relatively wide pulse width has prospective applications in mid-infrared nonlinear frequency conversion.

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2.1 $\unicode{x3bc}$ m，掺钬光纤激光系统的高能耗散孤子共振

提出了一种基于锁模种子激光器和双级放大器的2.1 μm高能耗散孤子谐振(DSR)光纤激光系统。在种子激光器中，采用非线性放大环镜技术实现锁模。利用带内泵浦方案和长增益光纤可以有效地激发2.1 μm脉冲。采用一段正常色散、高非线性的超高数值孔径光纤和大耦合比的输出耦合器实现了高能DSR系统。通过优化UHNAF长度为55 m，在适当的腔内极化状态和泵浦功率下，获得了2103.7 nm、88.1 nJ、3db频谱带宽0.48 nm、脉宽17.1 ns的DSR激光器。输出功率为0.233 W，转换效率为4.57%，均比以往报道的掺钬DSR种子激光器提高了一个数量级。由于种子激光器的高输出功率和纳秒级脉冲宽度，通过双级主振荡器功率放大系统，DSR激光器的平均功率线性放大到50.4 W。3db频谱带宽略微变宽至0.52 nm，放大后的脉冲波形没有失真。相应的脉冲能量达到19.1 μJ，是目前所知的掺钬锁模光纤激光系统的最高脉冲能量。这种2.1 μm、脉冲宽度较宽的高能DSR激光器在中红外非线性变频中具有广阔的应用前景。

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来源期刊

High Power Laser Science and Engineering Physics and Astronomy-Nuclear and High Energy Physics

CiteScore

7.10

自引率

4.20%

发文量

401

审稿时长

21 weeks

期刊介绍： High Power Laser Science and Engineering (HPLaser) is an international, peer-reviewed open access journal which focuses on all aspects of high power laser science and engineering. HPLaser publishes research that seeks to uncover the underlying science and engineering in the fields of high energy density physics, high power lasers, advanced laser technology and applications and laser components. Topics covered include laser-plasma interaction, ultra-intense ultra-short pulse laser interaction with matter, attosecond physics, laser design, modelling and optimization, laser amplifiers, nonlinear optics, laser engineering, optical materials, optical devices, fiber lasers, diode-pumped solid state lasers and excimer lasers.