Laser Focusing Lens Lasers generate a series of high intensity pulses. Each pulse contains 460mJ of energy and lasts 20ns?
The laser fires 10 such pulses per second. What is the average power output of the laser? The average power is the total energy delived per second. A lens focuses the laser beam to a 15 diameter circle on the target. During a pulse, what is the light intensity on the target? The intensity of sunlight at midday is about 1100 . What is the ratio of the laser intensity on the target to the intensity of the midday sun?
so the intensity of each pulse is 460*10^-3J during 20*10^-9 seconds
so the power output for that small length of time is
460E-3/20E-9=2.3*10^7 watts
now, the intensity of light is in units of watts/meter^2
Unfortunately, you did not give units to the diameter, but I'll try to work with it any way, so if it has a diameter of 15 units, then it has a radius of 7.5 units and a total area of 56.25pi units^2
so the total intensity is 2.3*10^7watts/56.25pi units^2
=1.30X10^5 Watts/Units^2
now, just convert the "units" to meters and you'll have the answer and be able to compare it to the 1100 watts/m^2 that sunlight exerts
I hope this helps!
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ADVANCED FOCUS SYSTEM(TM) WITH ONE-HANDED SPEED FOCUS(TM) ALLOWS USERS TO ADJUST FROM A BROAD FLOOD BEAM TO A FOCUSED SPOT BEAM WITH JUST ONE HAND BY SLIDING THE HEAD OF THE LIGHT FORWARD & BACK; 3-STEP QUICK-CYCLE SWITCH(TM) FUNCTION - PRESS FOR MAXIMUM LIGHT, CLICK FOR HIGH LIGHT & CLICK AGAIN FOR LOW LIGHT; LIGHTWEIGHT & DURABLE ALUMINUM BODY; OUTPUT: 200 LUMENS; EFFECTIVE RANGE: 689 FT; BATTERY LIFE: 64 HOURS; INCLUDES NYLON SHEATH & 4 AAA BATTERIES
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image Type 1/2.5" CMOS 5 MP
Effective pixels Approx.5.0 Mega Pixels(2560X1920)
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Lens Focal length Lens=3.315mm
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Thinning Hair & Laser Hair Therapy Bringing Weak, Limp Hair Back To Life
Thinning Hair… as we grow older, it seems our hair starts to loose that luster and vigor of youth. But is thinning hair inevitable?
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About the Author
Nancy Marsh in was born in london.He studied in chambridge university and doing research in laser hair treatment disease and learn more about laser hair treatment,laser hair therapy, please visit http://www.hairlaser.co.uk/
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