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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 >>>
Some pictures of the laser diode. Measuring sizes.
Structure of the laser diode
Endurance has made a measurement of the emitting area and we got results in microns (Height X Width): 35+-5% x 250+-5% uM.
The diode with weak light. Corrupted (damaged) crystal.
Connecting wires to the crystal (top view)
3 layers: laser diode structure
Wires to the crystal were burned
Sizes of the laser diode.
Size of the emitting laser spot.
Inside a NICHIA NUBM47 (next model after NUBM44) laser 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
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.
The photo shows the resulting spot and its size along the slow axis. Measured with a caliper. It turned out 31.53mm
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
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
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).
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!