Planar Waveguides and other Confined Geometries by Gerd Marowsky
Author:Gerd Marowsky
Language: eng
Format: epub
Publisher: Springer New York, New York, NY
At high repetition rates, this nonsymmetrical issue disappears, thanks to the isotropic heat diffusion out of the focal volume [25–27]. In fact, a circular symmetry of the waveguide cross section is achievable due to heat accumulation, which makes the waveguide larger than the focal point. Typically, the waveguide diameter increases with the repetition rate of the laser and can be up to ten times the focal diameter 2ω0 of the laser,
(6.1)
where λ is the wavelength of the laser, F is the focal length, and D is the beam diameter before the lens, as shown in Fig. 6.7.
Fig. 6.7Laser-focusing parameters
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