Calculate Laser Pulse Intensity (Optics)

  • Thread starter mecarey
  • Start date
  • #1
1
0
A laser pulse has a duration of 50 fs (50E-15 s) and an energy of 1 mJ. The laser is focused to an area of 50 micrometers square. What is the peak intensity and peak electric field at the focus?


I previously tried to do this problem with normal intensity equations using

intensity = power / area
and
power = joules/second

but I got a ludicrous answer in the range of 10^20 watts/meter square. My professor told me that my answer is wrong because it is a laser PULSE, not just a laser. Any help? I'm not too sure where to go now and my Optics book doesn't seem to cover laser pulses.

Thanks in advance - Matt
 

Answers and Replies

  • #2
Hi,

Hope this will help

Av Power = E/T

Peak Power = E/t

Intensity = Av Power/area

where,

E = energy of the pulse (i.e.1 mJ)
T = 1/f (f is the freq of laser pulse)
t = Duration of the pulse
area = 50 micrometers square.
 

Related Threads on Calculate Laser Pulse Intensity (Optics)

  • Last Post
Replies
4
Views
15K
  • Last Post
Replies
1
Views
738
  • Last Post
Replies
0
Views
6K
Replies
0
Views
2K
Replies
4
Views
5K
Replies
0
Views
2K
Replies
3
Views
5K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
7
Views
1K
Replies
1
Views
4K
Top