Homework Help: Overall power in Nd/YAG laser

1. Nov 28, 2012

nachos1

1. The problem statement, all variables and given/known data

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

2. Relevant equations
I cant figure out how to do this problem see attempt below:

3. 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)

2. Nov 29, 2012

nachos1

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?

3. Nov 29, 2012

TSny

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.

4. Nov 29, 2012

nachos1

ah yes you are correct, it should of been P=W/s not E

5. Nov 29, 2012

TSny

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: Nov 29, 2012