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
Optical system calculations
The projected laser beam spot and a focal depth
|Laser beam spot in mm||Max power density: kW / Cm^2||Focal depth in mm.|
|0.2 x 0.4||91||19.43-20.57|
|0.16 x 0.3||34||5.7-8.4|
|0.16 x 0.33||151||15.26-15.95|
|0.16 x 26||27||0-0.5|
|0.10 x 0.21||345||10.15-10.45|
Examples of pictures of spots obtained in the calculation:
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:
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:
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) >>>
Electronics and control board
NICHIA NUBM31 / NUBM31T diode array system datasheet
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