Recent content by MiddleVision

Does the filter effective index in the equation above have to be corrected then when that filter is not used in air? https://en.wikipedia.org/wiki/Interference_filter

I had to refresh my memory about this topic, now it makes sense. Thanks a lot for your replies :)

My questions is about the conversion of a range of wavelengths in Hz, such as for an optical filter, in a medium different from air. Since the refractive index n is higher than 1, (let's say n=1.5) and than the value of c is almost 2x108 m/s, also the equation in the link below has to be...

I thought that the 2.11 is valid only far away from the beam waist. After which value do you think it's "sensible" to use the far field approximation? I have plotted the beam radii propagation for the X and Y axis and after a distance of about 4 meter the two curves are overlapping each other...

I have used the following equation (2.8) to simulate the width at a given distance, using the beam width clip as w0. How do I include the angular divergence in the simulation of w(z)? Thanks Source: Sun, Haiyin. Laser diode beam basics, manipulations and characterizations. Springer Science &...

Thanks for your prompt reply. About the radius of the beam, how large would be the laser spot after, let's say, 1m or 50m?

Hi all, I am interested in finding the power of a laser diode as function of the distance z, assuming a free space propagation. I think to have enough information to work it out but I am stacked at the moment. Given: the initial power, P0 = 1mW beam width clip (e-2 = 13.5%), wx = 3μm, wy =...