DOI: https://doi.org/10.36347/sjpms.2025.v12i04.003

Pages: 97-106

This study examines the laser and its uses in medicine. It refers to light amplification by stimulated emission of radiation (SEER). This is electromagnetic radiation whose photons are equal in frequency and phase, and whose wavelengths interfere constructively, transforming into a light pulse. The history of laser development, which began in the mid-nineteenth century, is also studied. Lasers have evolved and their use in many fields has expanded. The components of the laser, including the active medium, the excited source, and the resonator, are also studied. The conditions for lasing are defined by three points: the presence of the active medium, the achievement of inverse rehabilitation. The laser's operating principle is also studied, which is based on three types of interactions: absorption, stimulated emission, and spontaneous emission. The characteristics of the laser are also studied, as its beam has four characteristics: monochromaticity, coherence, directivity, and brightness. The types of lasers, including solid-state lasers (such as ruby lasers), liquid lasers, chemical lasers, and others, are explained in detail in this research. Lasers have a wide range of practical applications. They are used in medicine, industry, mining, communications, and for measuring distances with extreme precision, among many other fields. In general, lasers are highly advanced and play a significant role in human life because they are linked to human health and medicine. Doctors will be able to use them more widely in the future to treat diseases using lasers.