Bismuth nanosheets based saturable-absorption passively Q-switching mid-infrared single-crystal fiber laser
文献类型：期刊论文
| 作者 | Hao, QQ; Zong, MY; Zhang, Z; Huang, H; Zhang, F; Liu, J; Liu, DH; Su, LB; Zhang, H |
| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2020-09-20 |
| 期号 | 18 |
| ISSN号 | 1000-3290 |
| DOI | 10.7498/aps.69.20200337 |
| 文献子类 | Article |
| 英文摘要 | As a new two-dimensional material, bismuth nanosheet is an effective modulator for realizing a mid-infrared pulsed laser, which benefits from its suitable band gap, higher carrier mobility and better room temperature stability, as well as its excellent electrical and optical properties. The mid-infrared single-crystal fiber is a preferable gain medium for high-power laser because of its advantages of both crystal and fiber. In this paper, a bismuth nanosheet saturable absorber is successfully prepared by the ultrasonic method and used for the first time in a diode-pumped Er:CaF2 single-crystal fiber mid-infrared passively Q-switching pulsed laser. A compact concave planar linear resonator is designed to study the Q-switching Er:CaF2 single-crystal fiber laser with bismuth nanosheets serving as saturable absorbers. The pump source is a fiber-coupled semiconductor laser with a core diameter of 105 mu m, a numerical aperture of 0.22, and a central emission wavelength of 976 nm. The pump light is focused onto the front end of the gain medium through a coupled collimating system with a coupling ratio of 1:2. The gain medium is a 4 at.% Er3+:CaF2 single-crystal fiber grown by the temperature gradient method, and this fiber has two polished but not coated ends, a diameter of 1.9 mm, and a length of 10 mm. To reduce the thermal effect, the single-crystal fiber is tightly wrapped with indium foil and mounted on a copper block with a constant temperature of 12 degrees C. The input mirror has a high reflection coating at 2.7-2.95 mu m and an antireflection coating at 974 nm, with a curvature radius of 100 mm. A group of partially transmitting plane mirrors are used as output couplers, respectively, with transmittances of 1%, 3%, and 5% at 2.7-2.95 mu m. The total length of the resonant cavity is 26 mm. By inserting the bismuth nanosheet into the resonator and carefully adjusting its position and angle, a stable mid-infrared Q-switching laser is obtained. At the absorbed pump power of 1.52 W, a pulsed laser with an average output power of 190 mW is obtained for an output mirror with a transmittance of 3%. The shortest pulse width is 607 ns, the repetition frequency is 58.51 kHz, and the corresponding single pulse energy and peak power are 3.25 mu J and 5.35 W, respectively. |
| WOS关键词 | OPTICAL MODULATORS ; ABSORBER ; WAVE |
| WOS研究方向 | Physics |
| 语种 | 中文 |
| 出版者 | CHINESE PHYSICAL SOC |
| 源URL | [http://ir.sic.ac.cn/handle/331005/27743]  |
| 专题 | 中国科学院上海硅酸盐研究所 |
| 推荐引用方式 GB/T 7714 | Hao, QQ,Zong, MY,Zhang, Z,et al. Bismuth nanosheets based saturable-absorption passively Q-switching mid-infrared single-crystal fiber laser[J]. ACTA PHYSICA SINICA,2020(18). |
| APA | Hao, QQ.,Zong, MY.,Zhang, Z.,Huang, H.,Zhang, F.,...&Zhang, H.(2020).Bismuth nanosheets based saturable-absorption passively Q-switching mid-infrared single-crystal fiber laser.ACTA PHYSICA SINICA(18). |
| MLA | Hao, QQ,et al."Bismuth nanosheets based saturable-absorption passively Q-switching mid-infrared single-crystal fiber laser".ACTA PHYSICA SINICA .18(2020). |
入库方式： OAI收割
来源：上海硅酸盐研究所
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