Properties and Uses of LASER - Talha's Physics Academy

Talha's Physics Academy

Properties and Uses of LASER

Video Lecture: Properties and Uses of Laser

Watch the complete physics lecture breaking down the fundamental characteristics of laser radiation and its vital real-world applications:

Monochromatic: Laser light consists of a single color or specific wavelength ($\text{Mono} = \text{one}$, $\text{chromatic} = \text{color}$). Unlike ordinary light sources that emit a broad spectrum of wavelengths, laser light exhibits extreme spectral purity with one precise wavelength.
High Intensity: Intensity is defined as the power emitted per unit area per unit solid angle. Due to its coherence and directionality, laser beam energy remains concentrated rather than dispersing. For example, a $1\text{ mW}$ Helium-Neon laser beam can appear more intense locally than sunlight because sunlight disperses widely across all directions.
Coherence: Two or more waves are coherent if they maintain a constant phase difference and a predictable correlation of amplitude and phase over distance and time (all wave crests and troughs align perfectly in phase).
Directionality & Low Divergence: Laser light travels in a highly collimated, single direction with minimal spreading. For instance, an ordinary flashlight beam spreads significantly over a distance of $1\text{ km}$, whereas a laser beam spreads only a few centimeters over the same distance.

Precision cutting tools for metals and materials that are simple to automate.
Robot-guided lasers used in apparel industries to cut precision pieces of cloth.
Surgical applications including repair of a detached retina and vaporization of kidney stones.

Barcode scanners in retail stores to convert printed barcodes into digital numbers and pricing data.
Semiconductor lasers in CD/DVD drives to read microscopic pits and lands, converting optical data into digital numbers.
High-capacity optical fiber communications transmitting data over long distances at high speeds.

Holography enables true three-dimensional image recording and reconstruction on photographic film or digital media using laser interference principles.