Laser pulse calculation - a quick bit of help appreciated

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Homework Help Overview

The discussion revolves around calculating the pulse power of a Nd:YAG laser in two scenarios: first, in free-running operation and second, when Q-switched. The original poster presents specific values for average power and pulse duration, seeking assistance with the calculations.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants inquire about the original poster's progress in calculations and suggest showing work done. The original poster attempts to clarify their reasoning for the first part of the problem, defining variables related to power and energy. They express uncertainty about their results and seek confirmation. For the second part, there is a suggestion that additional information may be necessary to proceed.

Discussion Status

The discussion is active, with participants prompting the original poster to share their calculations. Some progress has been made in understanding the first part of the problem, but there is a recognition of potential gaps in information for the second part, indicating a productive exploration of the topic.

Contextual Notes

There is an indication that the original poster may have misunderstood aspects of the calculations, particularly for the first part. The second part of the problem is noted to potentially require more information to resolve.

T7
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Hi,

a. A free-running, flashlamp-pumped Nd:YAG laser produced pulses having a duration of 500 microseconds at a repetition frequency of l00Hz. Deduce the pulse power in this type of operation if the average power of the laser is 5W. (100W)​

b. This laser is then Q-switched and the average power is reduced to 4W. Deduce the peak power of the Q-switched power (2MW)​

I'm sure this is simple, but I don't seem to be getting the answer I'm supposed to. Anyone care to show how it ought to be done? :smile:

Cheers.

T7
 
Last edited:
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Can you show us how far you have come in your calculations?
 
Mattara said:
Can you show us how far you have come in your calculations?

Yup. I think I've just realized what I was doing wrong as far as part a is concerned.

Let Pa denote average power
Let Pp denote power of one pulse
Let Ep denote energy of one pulse
Let t denote time of one pulse

If Pa = 5W, and f = 100Hz, then

Ep x 100 = 5 => Ep = 0.05
Pp = Ep / t = 0.05 / (500 x 10^-6) = 100W

I think that's right. (Hope so).
 
Last edited:
Mattara said:
Can you show us how far you have come in your calculations?

I would apply a similar sort of working to the second part. I don't see how it can be done without more information.
 

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