I have some lasers bought from Aliexpress for my experiments. the attached technical parameters are provided by the manufacturer. I need to calculate the uncertainty or the linewidth of the laser. Only the center wavelength is given.
Any help is highly appreciated. Thank you.
From the given paramters you can't calculate the line width. You will need to measure it.
The line width (and the spectrum in general), will in detail depend on the
- quality and parameters of the resonator
- the laser material, the width of its gain spectrum and its "natural line width"
- stabilization, temperature and its power
And probably many more little factors.
Depending on the resonator and laser material the laser might not even run on a single line, but actually many laser lines spaced by the free spectral range of the resonator. The central power peak might even jump around between different of these lines.
When you measure it, keep it mind you might actually be limited by your spectrometer, i.e. its limits.
Dear Hiran Gunawardana,
thank you for the question. We simply measure the linewidth by self-heterodyne method. See for example V.J. Urick et al. "Fundamentals of microwave photonics," Wiley, 2015, Fig. 3.17 (c).
Best regards.
Mikhail E. Belkin
MIREA - Russian Technological University
These lasers are probably diode lasers, so the output wavelength may vary quite a bit with operating temperature. This may or may not effect your usage.
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