Particularly for short resonators with large modes, severe problems can result from too weak diffraction effects. However, the depth of focus of an optical system at visible wavelengths is: This is true for planoconcave lenses as well, but because the surface is reversed, the focal length is negative. In fluorescence lifetime measurement, the ratio of the excitation pulse width to the fluorescence time should be photonics rule thumb A change in repetition rate alone usually has the simple effect of linearly rescaling the processing time, assuming that photonics rule thumb workpiece fully recovers between subsequent pulses.
The Photonics Spotlight
This discussion shows that a thorough understanding of diffraction effects and their consequences brings important insight into issues of resonator designin particular into typical physical limitations and the principles of common solutions. As a simple example, consider a linear resonator consisting of a flat and a concave focusing laser mirror. Want to Read saving… Error rating book. For focus shift, p to v is 3. This can be very useful in cases where the photonics rule thumb rate needs to be changed all the time, or some finite pulse trains are needed with larger temporal gaps in between, and each pulse including the first one in each burst needs to have well controlled parameters.
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Rules of Thumb
Of course, to some extent one can solve these by arranging for a tight focus somewhere insight the cavity. Particularly for short resonators with large modes, severe problems can result from too weak diffraction effects. Please login or register, for FREE, to post comments:
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