Q-switched partially coherent lasers with controllable spatial coherence

IF 0.7 4区物理与天体物理 Q4 OPTICS

Optica Applicata Pub Date : 2021-01-01 DOI:10.37190/oa210208

Yushuang Wang, Xuanxuan Ji, Ziyang Chen, Jixiong Pu

引用次数: 2

Abstract

We develop a Q-switched degenerate laser, delivering a partially coherent light pulse of duration about 16 ns. The spatial coherence of the output laser pulse can be varied by tuning the spatial filter inside the laser resonator, and the oscillating transverse mode structure can be determined by measuring the degree of coherence of the output laser pulse. It is shown that the larger is the diameter of the spatial filter, the more are the oscillating transverse modes, and the lower is the degree of coherence. Based on coherent-mode representation for the partially coherent source, we can estimate the transverse mode contribution to the output partially coherent laser. The experimental results on suppressing speckle demonstrate that the generated partially coherent light possesses the characteristics of rapid reduction of spatial coherence, making it an ideal source for high-speed imaging and ranging applications.

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可控空间相干的调q部分相干激光器

我们开发了一种调q简并激光器，提供持续时间约16 ns的部分相干光脉冲。通过调节激光谐振腔内部的空间滤波器可以改变输出激光脉冲的空间相干性，通过测量输出激光脉冲的相干度可以确定振荡的横模结构。结果表明，空间滤波器直径越大，振荡横模越多，相干度越低。基于部分相干源的相干模式表示，我们可以估计出横向模式对输出部分相干激光的贡献。抑制散斑的实验结果表明，产生的部分相干光具有空间相干性快速降低的特点，是高速成像和测距应用的理想光源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optica Applicata 物理-光学

CiteScore

1.00

自引率

16.70%

发文量

审稿时长

4 months

期刊介绍： Acoustooptics, atmospheric and ocean optics, atomic and molecular optics, coherence and statistical optics, biooptics, colorimetry, diffraction and gratings, ellipsometry and polarimetry, fiber optics and optical communication, Fourier optics, holography, integrated optics, lasers and their applications, light detectors, light and electron beams, light sources, liquid crystals, medical optics, metamaterials, microoptics, nonlinear optics, optical and electron microscopy, optical computing, optical design and fabrication, optical imaging, optical instrumentation, optical materials, optical measurements, optical modulation, optical properties of solids and thin films, optical sensing, optical systems and their elements, optical trapping, optometry, photoelasticity, photonic crystals, photonic crystal fibers, photonic devices, physical optics, quantum optics, slow and fast light, spectroscopy, storage and processing of optical information, ultrafast optics.