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Endurance NICHIA NUBM31 / NUBM31T 85 watt laser module

85 watt DIODE laser

Endurance has started to work on a new 85 watt laser module using NICHIA NUBM31 / NUBM31T laser diode array.

 

 

Universal optical system. Compatible with all types of lens: F=30 / 40 / 50 mm.

Possibility to install 2x F=30 lens and get a double laser optical power.

 

 

Initial laser beam parameters:

Beam divergence: 15 mRad

Aperture: 30 mm

Laser beam spot: 1 mm

Focal depth: 1.5 mm

AR coating: 405-455 nm

 

Projected optical system:

Material: BK 7
Laser lens diameter: 1-2”
Laser lens focus: 30-50 mm
Luminosity: 1:1

Optical system calculations

The projected laser beam spot and a focal depth

Laser beam spot in mmMax power density: kW / Cm^2Focal depth in mm.
0.2 x 0.49119.43-20.57
0.16 x 0.3345.7-8.4
0.16 x 0.3315115.26-15.95
0.16 x 26270-0.5
0.10 x 0.2134510.15-10.45

 

Examples of pictures of spots obtained in the calculation:

Endurance NICHIA NUBM31 / NUBM31T 85 watt laser module

This is the focal spot of an ideal lens with F = 1000 mm. Frame size 50 x 50 mm. The graphs show the intensity distributions in a spot (in W / cm2) along the horizontal and vertical axes passing through the center of the spot.

When focusing with an ideal lens, the shape of the spot in focus does not change, only its size changes. For example, a spot in the focus of an ideal lens with F = 25 mm:

 

Endurance NICHIA NUBM31 / NUBM31T 85 watt laser module

Here the frame size is 1.25 x 1.25 mm.

But when focusing with a real lens, due to aberrations, the shape of the spot also changes. This is how the spot looks when focusing with a single plano-convex lens with F = 25 mm:

 

Endurance NICHIA NUBM31 / NUBM31T 85 watt laser module

The size of the frame is the same 1.25 x 1.25 mm. It can be seen that the widths of the peaks changed slightly, but the distant wings appeared. For reference: now only 42% of the power emitted by the diode gets inside the 1.25 x 1.25 mm frame, while with an ideal lens, 97% of the power falls into the same frame. True, an ideal lens is considered ideal in every sense, i.e. it is believed that it does not introduce losses into the beam, while a real lens is assumed not to be anti-coated, which means that about 8%, or a little more, is lost due to reflection on its surfaces.

Detailed research (PDF) >>>

 

 

Cooling system

(in progress)

 

Electronics and control board

(in progress)

 

 

NICHIA NUBM31 / NUBM31T  diode array system datasheet

Endurance NICHIA NUBM31 / NUBM31T 85 watt laser module

 

 

 

Other modules like NUBM36 / NUBM34 are on our watch list…

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