A Gaussian beam is a type of laser beam that has a bell-shaped intensity profile. It is characterized by a narrow central peak, called the waist, surrounded by gradually decreasing intensity.
A 2-lens system is a setup that consists of two lenses placed in succession. The first lens focuses the incoming Gaussian beam, while the second lens further manipulates the beam's properties.
When passing through a 2-lens system, a Gaussian beam undergoes changes in its intensity profile, beam width, and direction. These changes are determined by the lenses' properties, such as their focal lengths and positions.
The purpose of using a 2-lens system with a Gaussian beam is to manipulate the beam's properties to meet specific experimental or practical needs. For example, the system can be used to focus the beam to a smaller spot size or to collimate the beam to travel in a straight line.
The output of a Gaussian beam passing through a 2-lens system is influenced by several factors, including the properties of the lenses, the distance between the lenses, and the initial properties of the beam, such as its waist size and wavelength.