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Laser beam spot improvement for 445 nm diode laser (success – new laser beam spot)

Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)

 

 

We are trying to reduce laser beam spot with a different lens.

Standard 3 element lens

Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)

Adding additional semicilindrical lens

Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)

Original images where you can measure the actual size

The problem that existing 3 elements, G2, G7 lens only decrease laser spot in one axis but do not decrease in the other. The is why you always see a rectangle and can not make it smaller to round or square.
3 element lens

We add a new flat convex lens.
3 element lens + flat convex lens

Further experiment

We setup a flat convex lens on 80 mm range from the laser diode. Closer to the surface.

 

we added Laser Beam Corrective Cylindrical Mirro set/For High Power 450nm laser Diode
For 405nm-450nm-465nm-473nm High Power Laser Diode’s Beam Collimation and correction.
With AR Coating.
Size: 8mm(L)x7mm(W)x2.5mm(thickness)
Width reduction´╝Ü~2 times

45×77 microns (uM) final beam spot vs. initial 85×130 microns (uM)

About different lens: laser beam spot, focal range.

this means that the density of the laser spot will be 400*600 / 200*350 = 3.4 times more, therefore, Endurance lasers can be ~3-3.4 times more efficient compared to standard 3 element

New laser lens developing scetch

new lens for Endurance lasers
Alternative laser lens focusing sketch

New experiments with decreasing a laser beam spot

using of a cylindrical flat convex lens + aspherical lens.
Laser beam spot improvement for 445 nm diode laser (success - new laser beam spot)

Measuring the laser beam angles (fast / slow axes). Checking proportions

original laser beam spot for NICHIA diodes NUBM44 / NDB7A75
decreasing a horizontal laser beam spot with a semi-cylindrical lens

Final result and a live demo of the improved laser lens system

New improved laser beam spot

0.03 mm laser line width
0.05 mm laser line width
Sevela laser lines with calibration grid

As a result, laser beam density will increase 4-5 times.

The initial laser beam spot is 85*130 = 11050
while the laser beam spot now is in the range 30-50 uM and it is a square it means that a final laser beam area is:
30*30 = 900 | 40*40 = 1600 | 50*50 = 2500
that means that a new laser beam area is at least 4-5 times less than it was before.

 

 

Price

495$ for an entire laser lens focusing system

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Endurance lasers special deal

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