中红外片上非线性激光器研究进展(特邀)  

Research progress of on-chip nonlinear mid-infrared lasers(invited)

作　　者：张敦祥 胡波 杨雪梅[1] 吴函 梁厚昆 ZHANG Dunxiang;HU Bo;YANG Xuemei;WU Han;LIANG Houkun(School of Electronic Information,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《红外与激光工程》2024年第7期21-40,共20页Infrared and Laser Engineering

摘　　要：中红外(Mid Infrared,MIR)波段在生物医学、环境监测以及强场物理等众多领域具有非常重要的应用。小型化高效率MIR激光器是近些年中红外领域的研究重点,其在MIR光谱探测和环境实时监测等应用领域具有重大的研究意义。尽管量子级联激光器(Quantum Cascade Laser,QCL)可直接产生MIR输出,但受限于辐射带宽和锁模机制。因此,非线性频率下转换技术仍然是片上宽带超快MIR脉冲生成的首选方案。基于非线性频率变换的片上MIR激光器具有结构紧凑、调谐光谱范围宽、稳定性高等优势,近年来得到了快速发展和广泛应用。首先介绍了基于二阶非线性频率变换的片上MIR激光器的研究现状,然后对四种主要的片上三阶非线性MIR激光器的研究进展进行了综述总结,包括受激拉曼-斯托克斯散射(StimulatedRamanStokesScattering,SRSS)、四波混频(FourWave Mixing,FWM)、频率梳(Frequency Comb,FC)和超连续谱产生(Supercontinuum Spectrum Generation,SCG)。Significance The mid-infrared(MIR) spectral range generally spans from 2 μm to 20 μm(500-5 000 cm-1),which includes numerous vibrational absorption lines of various atoms and molecules, and encompasses several atmospheric windows. Therefore, MIR lasers hold significant application value and potential in the fields such as remote sensing communication, spectroscopic detection, medical applications, and military uses. Miniaturized onchip integrated devices, which offer substantial advantages in size, power consumption, and large-scale production deployment, are particularly important. Thus, leveraging these characteristics to achieve miniaturized MIR photonic integrated devices is of outstanding significance. In recent years, MIR photonic integrated chips,which possess enormous potential in spectral measurement and biosensing, have become a research hotspot in integrated optics. Various MIR photonic integrated systems, which have been realized using materials such as silicon, germanium, indium phosphide(InP), and chalcogenide glass, demonstrate this potential. Among these systems, MIR light sources, which are crucial components, make the realization of on-chip integrated MIR lasers one of the pressing issues in MIR photonic integration.Progress Despite recent significant breakthroughs in the direct generation of broadband MIR pulses in quantum cascade lasers(QCL), their performance remains incompatible with some high-power applications, and the spectral bandwidth of these QCL combs is still quite narrow. Therefore, nonlinear frequency conversion techniques, which can achieve ultra-broadband spectra and ultrashort pulse outputs, are considered one of the most promising solutions for realizing miniaturized MIR lasers aside from QCL. Based on the order of nonlinear effects, they can mainly be divided into second-order nonlinear and third-order nonlinear effects. Second-order nonlinear effects include optical parametric generation(OPG), optical parametric amplification(OPA), difference frequency generation(DFG), and

关 键 词：中红外激光 片上集成 非线性光学 光梳 超连续谱 

分 类 号：O437[机械工程—光学工程]