Pulse laser and spectral width help

[krugertown]

A pulse 300ns long is made using a continuous wave laser and a very(very) fast shutter. What is (approx.) the minimum spectral width of the pulse?


I have no idea where to start. For starters what is the spectral width? and how would i go about solving this problem. Not looking for a solution just an idea of how to get it!

 

[bir720flip]

PHSI 231 that question is hard dog

 

[nlightner]

The spectral width refers to the range of wavelengths present in the pulse of light. To calculate the minimum spectral width of the pulse, we can use the formula:

Δλ = c/Δt

Where Δλ is the spectral width, c is the speed of light, and Δt is the pulse duration. In this case, we are given that the pulse duration is 300ns. We can convert this to seconds by dividing by 1 billion (since 1 ns = 1 billionth of a second). This gives us a pulse duration of 0.0000003 seconds.

Plugging this into the formula, we get:

Δλ = (3x10^8 m/s) / (0.0000003 s) = 1x10^15 m

This means that the minimum spectral width of the pulse is approximately 1 picometer (1x10^-12 meters). This is a very narrow range of wavelengths and indicates that the pulse is highly monochromatic, or composed of a single wavelength. This is possible with the use of a continuous wave laser and a very fast shutter, which allows for precise control over the duration of the pulse.