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Inside the laser diode (NICHIA NUBM44 / NUBM47)

Inside the alser diode
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Live video journey inside the laser diode with 100 x optical zoom


I know that many of you dreamed to look inside the laser diode.

Today I made a few images of that.


This is NICHIA NUBM44 / NUBM47.

We use 1000X digital zoom with this digital microscope >>>

Using a digital microscope for laser beam focusing


Some pictures of the laser diode. Measuring sizes.

NUBM44 laser diode
NUBM44 laser diode
NUBM44 laser diode

Structure of the laser diode

A structure of the laser diode
Laser diode - structure

Endurance has made a measurement of the emitting area and we got results in microns (Height X Width): 35+-5% x 250+-5% uM.


Laser beam parameters for NICHIA NUBM44 / NUBM47 laser diodes


The diode with weak light. Corrupted (damaged) crystal.

NUBM47 laser diode
Anode wiring

NUBM47 laser diode
NUBM47 laser diode
NUBM47 laser diode
NUBM47 laser diode
Connecting wires to the crystal (top view)

NUBM47 laser diode
Inside laser diode
3 layers: laser diode structure

Inside laser diode

Wires to the crystal were burned

Inside laser diode

Sizes of the laser diode.

Inside laser diode - size

Size of emitting spot of the laser diode
Size of the emitting laser spot.

Emitter size 0.692x0.189 mm
Emitter size 0.692×0.189 mm

Inside a NICHIA NUBM47 (next model after NUBM44) laser diode

Good diode

Burned diode (burnt threads)


If you have a problem with the laser. It stopped cutting or engraving – remove the lens and explore the laser beam.

A detailed video showing good vs. bad laser beam spot (unfocused)


Excellent diode picture

Damaged diode



Another example of a burned (dead) diode (collapsed laser beam form – unfocused)

The rectangle is no longer distinguished.


The rectangle has some damages inside (could happen when the dust hits the exit mirror on the diode and burns on its surface)


Laser power loss on 2 feet range


Measuring a laser beam spot of NUBM44/47 laser diode

25 mm (1”)


50 mm (2”)


100 mm (4″)


100 mm (4″) with G2 lens



The divergence along the “fast” axis corresponds to a numerical aperture of approximately 0.39 (if taken at the 90% power level) and 0.47 (at the 95% power level).


The numerical aperture for the “slow” axis is 0.157 for 25+13=38 mm, 0.158 for 50+13=63 mm and 1.61 for 100+13=113 mm, i.e. on average at the level of 0.16. This is quite typical for diodes of this type, with a strip width of 100…400 µm.


Slow axis measurement

The photo shows the resulting spot and its size along the slow axis. Measured with a caliper. It turned out 31.53mm

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Distance from lens body to screen 2719.4mm
The lens is recessed into the body by 7.7mm
In total, it turns out that the distance from the lens to the screen is 2727.1mm

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Lens body length 10.9mm
Outside, the lens body protrudes from the diode sleeve by 6.22mm
So the lens is screwed into the diode sleeve by 4.68mm
Sleeve depth to laser diode 7.2mm
Distance from the emitter to the outer border of the laser diode housing 0.9mm
In total, it turns out that the distance from the emitter to the lens is 3.42mm

According to the formula: 31.53 / 2727.1 * 3.42 = 0.0395 mm


G2 laser lens
G2 laser lens

The lens is plano-convex (I attach a photo). Diameter 6.36 mm, height of the cylindrical part 1.5 mm, total height 3.33 mm.
The lens was placed with the convex side facing the emitter. The distance was measured to the convex edge of the lens (that is, to the point of the lens closest to the emitter).


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If you have any more questions about laser diodes, laser beam quality, and laser power – you may ask us in a Livechat and we will be happy to assist you!

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