Laser Numerical Problem No.3  Lasers and Fibre Optics  Engineering Physics 2  Summary and Q&A
TL;DR
Calculate the power per unit area (intensity) of a laser beam based on given energy and spot size.
Key Insights
 ๐ Intensity of a laser beam is calculated by dividing the power by the area.
 โ Power is obtained by dividing the given energy by the time period.
 ๐คจ The area of a circular spot can be found using the formula pi * radius^2.
 ๐ The intensity of a laser beam is expressed in watts per square meter.
 ๐ Calculation of intensity helps assess the effectiveness and potential impact of the laser beam.
 โ Understanding power, area, and intensity is essential in laser system analysis.
 ๐ Laser beams with higher intensity have greater power concentrated in a smaller area.
Transcript
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Questions & Answers
Q: What is the formula for calculating power?
The formula for power is energy divided by time. In this case, it is 5 * 10^3 Joules divided by 10^6 seconds, resulting in 5 * 10^3 watts.
Q: How do you calculate the area of the spot?
The area of the spot can be found by using the formula pi * radius^2. Given a radius of 1.44 * 10^5 meters, the area is 6.511 * 10^10 square meters.
Q: What is the formula for intensity?
Intensity is calculated by dividing the power by the area. In this case, it is 5 * 10^3 watts divided by 6.511 * 10^10 square meters, resulting in an intensity of 6.91 * 10^12 watts per square meter.
Q: What is the significance of calculating intensity in laser systems?
Calculating intensity is important in laser systems as it helps determine the power per unit area. This information is crucial in understanding the potential impact and effectiveness of the laser beam on the target.
Summary & Key Takeaways

The video explains how to calculate the intensity of a laser beam by finding the power and area.

The power is determined by dividing the given energy by the time it is emitted.

The area of the circular spot is calculated using the formula pi * radius^2, and then the intensity is found by dividing the power by the area.