Abstract
A new type of laser system, known as a digital laser, was proposed in 2013. Many well-known laser beams with known analytical forms have been successfully generated in digital lasers. However, for a light field that does not have an analytical form, such as a multi-point light field or a light field with an arbitrary lateral distribution, how to generate such a light field from a digital laser has not been explored. The goal of this study was to experimentally explore how to generate an on-demand lateral laser field in a digital laser. In this study, a multi-point Gaussian laser beam was successfully generated in a digital laser by both controlling the range of the laser gain and the modulation of the phase boundary of the end of the cavity. This study then generated laser beams with an on-demand lateral field distribution by generating a superimposed multi-point laser field in a digital laser. Examples of triangles, rectangles, and letter T-shaped light fields produced by digital lasers were experimentally demonstrated. In summary, this study experimentally showed that a laser beam with an on-demand lateral field distribution could be generated in a digital laser by generating a superimposed multi-point laser field in a digital laser, in which a laser gain region covering the entire intra-cavity multi-point light field and the projected SLM (spatial light modulator) modulation function adopting a mimic amplitude mask are both used.
Highlights
Structural beams, which are light beams with a specific transverse field distribution, have been widely used in areas such as lithography [1,2,3], photopolymerization [4,5,6,7,8,9,10], optical tweezers [11,12,13], and other applications
Most of the optical elements used for intra-cavity beam shaping must be specially designed for the specified lasering light field
This study experimentally shows that a laser beam of on-demand lateral field distribution can be generated in digital laser by generating a superimposed multi-point laser field in digital laser, in which a laser gain region covering the entire intra-cavity multi-point light field and the projected SLM modulation function adopting an amplitude mask are both used in the digital laser system
Summary
Structural beams, which are light beams with a specific transverse field distribution, have been widely used in areas such as lithography [1,2,3], photopolymerization [4,5,6,7,8,9,10], optical tweezers [11,12,13], and other applications. Intra-cavity laser beam shaping is mainly accomplished by placing refractive/diffractive optical elements in the laser cavity, so as to modulate either the phase and/or the amplitude of the oscillating light field in the laser cavity [20,21,22,23,24,25,26]. Most of the optical elements used for intra-cavity beam shaping must be specially designed for the specified lasering light field. This is not as good as an SLM (spatial light modulator) or DMD (digital mirror device), which are commonly used in external cavity beam shaping to dynamically control the lasering light field.
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