In optics, a Gaussian beam is an idealized beam of electromagnetic radiation whose amplitude envelope in the transverse plane is given by a Gaussian function; this also implies a Gaussian intensity (irradiance) profile.

A small beam waist (more precisely, a beam waist with small waist radius), also called a tight beam focus, can be obtained by focusing a laser beam with a lens which has a short focal length and most importantly a high numerical aperture, and making sure that the lens aperture is largely filled by the input beam.

本计算器可根据透镜处的光束直径、波长和您输入的其他参数，为您提供激光光斑尺寸和激光束腰值。

通过一个数值孔径较大的透镜聚焦可以获得较小的束腰半径。 对于不是圆形的光束，对于不同截向方向来说束腰的位置是不一样的，这个被称为像散效应。

通过一个数值孔径较大的透镜聚焦可以获得较小的束腰半径。 对于不是圆形的光束，对于不同截向方向来说束腰的位置是不一样的，这个被称为像散效应。

Due to diffraction, a Gaussian beam will converge and diverge from an area called the beam waist (w 0), which is where the beam diameter reaches a minimum value. The beam converges and diverges equally on both sides of the beam waist by the divergence angle θ (Figure 2).

2007年7月11日 · Terms like “beam size”, “waist size”, “beam width” and alike are suitable only for qualitative statements like “The beam size sharply increases as the resonator length approaches the stability limit”. But nobody knows for sure whether some “size” or “width” refers to beam diameter or beam radius.

The plane z =0 marks the location of a Gaussian waist, or a place where the wavefront is flat, and w 0 is called the beam waist radius. The irradiance distribution of the Gaussian TEM 00 beam, namely, where w = w(z) and P is the total power in the beam, is …

3 天之前 · 束腰（Beam Waist）是光束传播过程中最小波束半径的位置，这个概念在激光技术中尤为重要。随着激光技术的发展，人们对光束的控制需求越来越高，束腰的概念应运而生。

Understanding the beam waist is fundamental for designing and optimizing laser systems. By grasping the concepts of beam waist, Rayleigh range, and divergence, and knowing how to calculate and measure these parameters, one can ensure the optimal performance of laser systems in various applications.