【摘 要】
：
Modal decomposition technology is an effective method to study the mode characteristics of laser beam in few-mode fi-bers.However,certain types of eigenmodes in the fiber can cause focal shift and affect the accuracy of modal decompo-sition.This article f
【机 构】
：
State Key Laboratory of Laser Interaction with Matter,Changchun Institute of Optics,Fine Mechanics a
论文部分内容阅读
Modal decomposition technology is an effective method to study the mode characteristics of laser beam in few-mode fi-bers.However,certain types of eigenmodes in the fiber can cause focal shift and affect the accuracy of modal decompo-sition.This article focuses on the influence of the focal shift of Laguerre-Gaussian mode and Linear Polarization mode on modal decomposition,and the research is based on correlation filter and the optimization algorithm of focal shift.The two-step ABCD algorithm is used to simulate and analyze the focal shift phenomenon of the two kinds of eigenmodes and the error influence of focal shift on the mode decomposition;Meanwhile,an iterative algorithm based on Fresnel diffraction is proposed to numerically calculate the light field distribution in focal plane to avoid the influence of focal shift errors.The focal shift analysis and its optimization algorithm make the modal decomposition technology be appli-cable to engineering applications.
其他文献
The present study reports the titanium dioxide(TiO2)films synthesized from TiCl3 precursor on ITO glass substrates using two electrochemical techniques,namely direct electro-deposition(DE)and pulse electro-deposition(PE).The synthesis potential during the
We propose and demonstrate a simple method to accomplish arbitrary free spectral range (FSR) control of optical fre-quency combs (OFC).The approach is based on the combination of an optical tapped delay line (OTDL) structure and a phase modulator (PM).The
We propose a novel refractive index sensor based on Michelson interferometer by using double-core microfiber.Through the reflection of the end and taper of double-core fiber (DCF),the Michelson interference spectrum is formed.Owing to the structure charac
A coherent detection Doppler wind lidar(CDWL)system simulation for both ground-based and space-based platforms is established in this study by using the PcModwin and BACKSCAT software to construct an atmospheric model in autumn and winter.Based on the lig
A dual-lens-integrated distributed feedback (DFB) laser based on hybrid integration for single-mode transmitter opti-cal subassembly (TOSAs) is discussed in this paper.The alignment and fixing of the lenses are simple to manipulate and highly accurate,mak
In order to obtain excellent slow-light performance,we propose a photonic crystal waveguide (PCW) that introduces extrinsic defect rods in the center row of a complete square lattice rotated 45° counterclockwise and the second row adjacent to it.The conti
A conduction cooled high peak power,narrow linewidth,and sub-nanosecond multi-beam laser as an excellent candi-date for non-scanning lidar is demonstrated.This laser is based on master oscillator power amplifier (MOPA) scheme which consists of a pulse pum
The visible light communication (VLC) system employs large viewing divergence angle light-emitting diode (LED) to realize illumination and communication simultaneously,so the geometric loss of optical power may reach tens of decibels,moreover,considering
Tantalum pentoxide (Ta2O5) and ultraviolet reflective (UVR) multilayer films were deposited on quartz glass sub-strates by an electron beam evaporation system equipped with a hall ion source,respectively.The optical properties of Ta2O5 film and the UVR fi
In this paper,we have successfully demonstrated a Q-switched pulse generation utilizing lutetium oxide (Lu2O3) thin film based saturable absorber (SA) in all-fiber erbium-doped fiber laser (EDFL) cavity with a bidirectional pumping.The Lu2O3 powder is mix