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Damage Threshold Test

***This is for estimation purposes only using these test conditions, using different conditions will have different results
 

 



Test conditions: 
(See Figure 1)
 

1.06µ Nd:YAG Laser, 

 

Freq. = 10pps, 

 

Aperture = 1550µ

 

Laser Pulse Width (duration) = 50 µs


 Spot diameter in focal plane  

  25µ = 2.5 x 10-3cm


Readout = Molectron #5200 power meter with PM3 detector

   
Readout integration time constant = 1.0 sec 

 

W. Blumenfeld
10/16/00

Calculations: 

Spot area = πr 2 = 3.14 x 1.25
x 1.25 x 10-6 cm2 = 4.91 x 10-6 cm2

Measured Ratio of P (Focal Plane) to P Laser Output) = 566mW / 1,280mW = 0.442

Laser Power averaged over one second.  (See fig 3).

 


Parameters:

Integrated Pulse Power (mW) = Power (F.P.) / 10

Pulse Energy (J)  =  Integrated Pulse Power (mW) / Integration time (ms)

Pulse Power (W) = Pulse Energy  (mJ) / Pulse Duration (ms)

Pulse Irradiance (W/cm2) = Pulse Power (W) / Spot Area (cm2)

Pulse Energy Density (J/cm2) = Pulse Energy (J) / Spot Area (cm2)
 
Sample  Power Power Pulse Pulse Pulse Energy
(Laser) (F.P.) Energy Power Irradiance Density
(mW) (mW) (mJ) (W) (W/cm2) (J/cm2)

0.0005” Cu
0.0002” Au coating

 89 39 3.9 78 15.9 x 106 794

0.0005”Cu
0.0002” black coating

 73 32 3.2 64 13.0 x 106 652

0.001 Molybdenum
 no coating

 60 27 2.7 54 11.0 x 106 550

0.0005” Cu
no coating

 260 115 11.5 230 46.8 x 106 2340

0.030” Ceramic
(alumna)

 405 179 17.9 358 72.9 x 106 3540

0.001” Stainless Steel
(300-series)

 46 20 2.0 40 8.15 x 106 407

 
Figure 2
Figure 2 - Optical Aperture Diagram

Figure 3 - Laser Duty Cycle Chart

 
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Glen Arm MD, 21057-9503
Call: (410) 592-3106
Fax: (410) 592-3362
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