Experiment: measure He-lamp spectrum

[Trinitiet]

Homework Statement

Today I did an experiment to met the light intensity, a function of the wavelength of light. I gained a theoretical model *how it should look*, which had 1 light intensity peak at lambda=1083nm.

On the other hand, I measured several peaks, 1 at ~600nm and another at ~750 and 825nm.

What could've been the source of these peaks?

The Attempt at a Solution

The first thought I had was the measurements weren't accurate, but I did the experiment over and over again and kept getting the peak.

Second thought: it's backgroundradiation. So I removed the Helium lamp and turned off the lights of the room and did the experiment again. No peaks were measured thus they can't be caused by background sources.Anyone got a thought what could cause these peaks? The line up of the experiment:

Helium lamp (with a steellike frame around it, though this can't cause the peak as it was still there when we did the background no measured peaks experimtn), then a collimator, then a lens, a glass prism, another lens and then a light sensor.

Is any additional information needed?

 

[NateD]

The source of the peaks could be caused by any variable in the experiment. It could be from the helium lamp, the collimator, the lenses, the glass prism, or the light sensor. To determine the source of the peaks, it would be necessary to take a closer look at each component of the experiment and make sure that they are all functioning properly. Additionally, it may be useful to compare the results of the experiment with the theoretical model to see if any variables are different in the experiment than what is expected.