Hello,
I am using the Opolette mid-IR tunable laser source. When I'm using it to tune wavelength (from 3um to 3.4 um), for each wavelength I am getting a pulse. It means the laser is not sending continuous wave, instead it is sending bursts at each wavelength. I am using oscilloscope to see the pulse since I don't have spectrometer in that wavelength range. So in the oscilloscope, I can see a time varying voltage pulse for each wavelength. When the laser light passes through my device, I am supposed to see a change in the output voltage observed in the oscilloscope. However, only the duration of the pulse changes, not the voltage magnitude. My final goal is to get the output voltage versus wavelength.
Has anyone used the laser source before or does anyone have any idea how do I get output spectrum vs wavelength?
For convenience, below I have attached the pulse I can see in oscilloscope for a single wavelength (x-axis is time in sec. and y-axis is voltage in Volts).
Thanks in advance.
Thanks for your valuable suggestion. I am using a photodetector. Actually I have used an aperture. Even though the detector is not saturating now, I am not observing any change in the voltage magnitude.
Hello,
For extracting any dependence of the photodetector signal on the wavelength, you need to have either a non-flat response of the detector, or a not-flat output power dependence, both vs. the wavelength. (In the unlike case both the dependencies might compensate each other, so the measured signal will be flat again.)
Also the proper power stability of the laser should be present.
Once you're sure the detector is not saturated (which seem to took place for the picture shown above), no change in the voltage magnitude corresponds to one of the three described situations.
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