Calculating Overall Power in Nd/YAG Laser

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Homework Help Overview

The discussion revolves around calculating the overall power of a Nd/YAG laser operating at a specific repetition rate and energy per pulse. The subject area includes concepts of power, energy, and frequency in the context of laser physics.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the relationship between energy, power, and time, with attempts to apply relevant equations. Questions arise regarding the correct use of symbols and units, particularly distinguishing between energy and power.

Discussion Status

Some participants have made progress in their calculations and are verifying their understanding of the relationships between the variables. There is an acknowledgment of potential confusion regarding the notation used for energy and power, indicating a productive dialogue on clarifying these concepts.

Contextual Notes

Participants are working within the constraints of a homework assignment, which may limit the information available for discussion. There is an emphasis on ensuring correct unit usage and understanding of fundamental definitions in the context of the problem.

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Homework Statement



In the units of watts (J/s) calculate the overall power of the laser light generated by Nd/YAG laser operating with a 10 Hz repetition rate in the third harmonic (355nm) at 150mJ per pulse

Homework Equations


I can't figure out how to do this problem see attempt below:


The Attempt at a Solution


I know the following:
Power= E/t=J/s=watt
E=hc/wavelength
E=(Hz)(6.626E-34 J/s)
 
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ok so I think i figured it out

f=10Hz
t=1/f
t=0.1 sec

E=150mJ/0.1 sec
E=1.5 J/s

is that correct?
 
I think so, but note that you used E for energy in the statement of the problem and now you're using E for power.
 
ah yes you are correct, it should of been P=W/s not E
 
nachos1 said:
ah yes you are correct, it should of been P=W/s not E

Yes, P for power. But now your units aren't correct if W is watts. 1W = 1 J/s. (or is W for "work"?)
 
Last edited:

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