波导准光谐振器中高阶横模的控制

Q4 Physics and Astronomy
A. Degtyarеv, M. Dubinin, O. Gurin, V. Maslov, K. Muntean, V. Ryabykh, V. Senyuta, O. Svystunov
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引用次数: 1

摘要

主题和目的。本文研究了基于波导的介质激光器中高阶模的选择和聚焦问题。目的是澄清的行为,并允许控制,连续太赫兹频率激光束的各种空间偏振的物理基础。方法和方法论。采用矩阵法计算了非均匀相位阶跃镜波导激光谐振腔的模态参数。利用矢量瑞利-索默菲尔德理论分析了准光谐振器的波模在不同衍射区激发的激光束的传播和聚焦。相关的实验研究使用已知的测量方法适用于太赫兹频率范围。结果。提出了一种选择太赫兹激光谐振腔高阶eh12q模式的方法,并对其进行了理论验证和实验验证。它设想放置一个额外的元件来控制系统的模态结构,即在一个谐振镜表面上的(2.3…2.8)λ宽的凹槽。这一措施会显著增加所有不希望出现的模式的损耗。同时,较高eh12q模式的损耗几乎保持不变,这为其主导激励创造了条件。本文对介电波导谐振器不同空间极化的高阶模在自由空间的适度聚焦和“锐”聚焦进行了理论和实验研究。结论。结果表明,所提出的带凹槽的相位阶跃反射镜可以有效地选择所需的高阶横向模态。线偏振eh12q模式在所用透镜的焦点区域具有最大的场强度。对于方向偏振的TE02q-和te03q -模式,中心叶明显偏离透镜焦点,具有场最大值。在径向极化TM02q-和tm03q模式的场分布中,通过“锐”聚焦观察到轴向强度的增加。在这种情况下,它们的中央叶,就像那些更高的te0nq模式一样,明显地偏离了透镜焦点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CONTROL OVER HIGHER-ORDER TRANSVERSE MODES IN A WAVEGUIDE-BASED QUASI-OPTICAL RESONATOR
Subject and Purpose. The problems under consideration concern selection and focusing of higher-order modes in a waveguide-based dielectric laser. The purpose is to clarify the physics underlying the behavior of, and permitting control over, continuous terahertz-frequency laser beams of various spatial polarizations. Methods and Methodology. The mode parameters of the waveguide-based laser resonator involving an inhomogeneous phase-stepped mirror were calculated in a matrix technique. To analyze the propagation and focusing of the laser beams that can be excited in a variety of diffraction zones by the wave modes of a waveguide-based quasi-optical resonator, a vectorial Rayleigh–Sommerfeld theory was used. The pertinent experimental studies were performed with the use of known measurement methods suitable for the terahertz frequency range. Results. A method for selecting the higher-order EH12q-mode of a terahertz-range laser resonator has been suggested, substantiated theoretically and approbated in experiment. It envisages placing an additional element to perform control over the system’s modal structure, namely a (2.3…2.8) λ-wide groove on the surface of one of the resonator mirrors. This measure can significantly increase losses for all undesirable modes. At the same time, the losses for the higher EH12q-mode remain practically unchanged, which creates conditions for its predominant excitation. Theoretical and experimental studies of moderate and ‘sharp’ focusing in free space of higher-order modes with different spatial polarizations of a dielectric waveguide-based resonator have been carried out. Conclusion. As has been shown, the proposed phase-stepped mirror with a groove can effectively select the higher-order transverse modes that may be required. The linearly polarized EH12q-mode has maximum field intensity in the focal region of the lens employed. For azimuthally polarized TE02q- and TE03q-modes the central lobes, noticeably shifted from the focus of the lens, have a field maximum. An increase in the axial intensity is observed upon ‘sharp’ focusing in the field distribution of the radially polarized TM02q- and TM03q-modes. In this case their central lobes, like those of the higher TE0nq-modes, are noticeably shifted from the lens focus.
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来源期刊
Radio Physics and Radio Astronomy
Radio Physics and Radio Astronomy Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
0.60
自引率
0.00%
发文量
18
审稿时长
8 weeks
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