中红外-近红外频谱转换是实现诸多中红外波段应用的重要技术,转换效率和调谐范围通常由于泵浦-信号频率失谐量大而受限。提出一种新型As2Se3硫系光波导,通过色散调控对波导结构进行优化设计,使光波导在2 μm波长附近具有正常群速度色散及负的四阶色散,达到泵浦-信号频率失谐量大的四波混频过程的相位匹配。研究了该波导的中红外-近红外频谱转换性能。结果表明,当泵浦光波长位于靠近零色散点的正常色散波长区时,可以实现宽范围可调谐的高效率频谱转换。通过调节泵浦光波长在(1955±30) nm范围内变化,实现了2.7~6.2 μm中红外光波的频谱转换及参量放大,可调谐范围达到3.5 μm。该波导有望应用于宽可调谐中红外激光产生及中红外信号的高灵敏度探测。
非线性光学器件 集成光学器件 群速度色散 四波混频 激光与光电子学进展
2022, 59(3): 0323003
1 上海大学特种光纤与光接入网省部共建国家重点实验室培育基地,上海 200072
2 苏莱曼尼耶大学物理系,库尔德斯坦
3 穆桑纳理工学院工程系,314 阿曼苏丹
4 阿斯顿光子技术研究所,阿斯顿大学,伯明翰 英国B4 7ET
5 纳米科学实验室,阿斯顿大学,伯明翰 英国B4 7ET
作为超快光纤激光器核心部件的可饱和吸收体近年来在纳米科学发展的带动下取得了很多突破性的进展,尤其是以碳纳米管材料为代表的光纤型可饱和吸收体受到了国际上的广泛关注。超快光纤激光器的应用不断扩展,包括精细加工、光谱特性探测、无损成像、光频率梳产生、材料的超快动力学研究等。针对近年来基于碳纳米管的超快光纤激光器的工作做一部分综述工作。对碳纳米管的原理、制备、非线性光学特性,尤其是在超快光纤激光器中的应用做出总结。
超快光纤激光器 锁模激光器 碳纳米管 非线性光学器件
1 上海大学特种光纤与光接入网省部共建国家重点实验室培育基地, 上海, 200072
2 苏莱曼尼耶大学物理系, 库尔德斯坦
3 穆桑纳理工学院工程系, 314, 阿曼苏丹
4 阿斯顿光子技术研究所, 阿斯顿大学, 伯明翰, 英国B4 7ET
5 纳米科学实验室, 阿斯顿大学, 伯明翰, 英国B4 7ET
作为超快光纤激光器核心部件的可饱和吸收体近年来在纳米科学发展的带动下取得了很多突破性的进展, 尤其是以碳纳米管材料为代表的光纤型可饱和吸收体受到了国际上的广泛关注。超快光纤激光器的应用不断扩展, 包括精细加工、光谱特性探测、无损成像、光频率梳产生、材料的超快动力学研究等。针对近年来基于碳纳米管的超快光纤激光器的工作做一部分综述工作。对碳纳米管的原理、制备、非线性光学特性, 尤其是在超快光纤激光器中的应用做出总结。
超快光纤激光器 锁模激光器 碳纳米管 非线性光学器件 ultrafast fiber laser mode-locked laser carbon nanotube nonlinear optical device
Author Affiliations
Abstract
1 Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
2 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China
The conversion efficiency on the sixth harmonic of 1064 nm in KBe2BO3F2 (KBBF) at different gas pressures in two kinds of gases, helium and nitrogen, is measured and compared. In the both gases, maximum conversion efficiency on the sixth harmonic of 1064 nm in high vacuum is nearly 10% of 355 nm, which is almost four times higher than that in low vacuum. The maximum average output power at 177.3 nm is 670 \muW with the repetition rate of 10 Hz and the duration of 20 ps in high vacuum. It indicates that the sixth harmonic generation in high vacuum is more preferable than that in low vacuum.
深紫外 非线性光学 非线性光学材料 非线性光学器件 000.2690 General physics 190.4360 Nonlinear optics, devices 190.4400 Nonlinear optics, materials 190.4160 Multiharmonic generation Chinese Optics Letters
2009, 7(7): 07621
Author Affiliations
Abstract
Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana IL, 61801, USA
Slow and fast light in quantum-well (QW) and quantum-dot (QD) semiconductor optical amplifiers (SOAs) using nonlinear quantum optical effects are presented. We demonstrate electrical and optical controls of fast light using the coherent population oscillation (CPO) and four wave mixing (FWM) in the gain regime of QW SOAs. We then consider the dependence on the wavelength and modal gain of the pump in QW SOAs. To enhance the tunable photonic delay of a single QW SOA, we explore a serial cascade of multiple amplifiers. A model for the number of QW SOAs in series with variable optical attenuation is developed and matched to the experimental data. We demonstrate the scaling law and the bandwidth control by using the serial cascade of multiple QW SOAs. Experimentally, we achieve a phase change of 160° and a scaling factor of four at 1 GHz using the cascade of four QW SOAs. Finally, we investigate CPO and FWM slow and fast light of QD SOAs. The experiment shows that the bandwidth of the time delay as a function of the modulation frequency changes in the absorption and gain regimes due to the carrier-lifetime variation. The tunable phase shift in QD SOA is compared between the ground- and first excited-state transitions with different modal gains.
非线性光学器件 相干光学效应 量子阱、量子点光学器件 半导体光放大器 230.4320 Nonlinear optical devices 270.1670 Coherent optical effects 250.5980 Semiconductor optical amplifiers Chinese Optics Letters
2008, 6(10): 736
Author Affiliations
Abstract
College of Science, Harbin Engineering University, Harbin 150001
Nonlinear optical properties of stimulated Brillouin scattering (SBS) to signal detection in water are analyzed. With the threshold characteristics, SBS only occurs when the high power laser is focused in the SBS cell. When there is an object present in front of the focus, it leads to lower incident intensity and then SBS does not occur. The backward SBS signal depends on the focusing location. The nonlinear optical properties of SBS process in the focusing regime are analyzed theoretically. With the object coming near to the focusing center, the backward Stokes signal rises up from zero to a maximum, and then grows to saturation. The delay time of the echo signal to pump signal can give the object location. In experiment, the peak position of varying rate of energy can give object location.
激光雷达 非线性光学器件 受激散射 可见光激光 010.3640 Lidar 190.5890 Scattering, stimulated 140.3580 Lasers, solid-state 140.7300 Visible lasers Chinese Optics Letters
2008, 6(2): 02137