By Haiyin Sun
This e-book deals the reader a realistic consultant to the keep watch over and characterization of laser diode beams. Laser diodes are the main generic lasers, accounting for fifty% of the worldwide laser marketplace. right dealing with of laser diode beams is the most important to the winning use of laser diodes, and this calls for an in-depth realizing in their detailed properties.
Following a brief creation to the operating ideas of laser diodes, the publication describes the fundamentals of laser diode beams and beam propagation, together with Zemax modeling of a Gaussian beam propagating via a lens. The middle of the ebook is anxious with laser diode beam manipulations: collimating and focusing, circularization and astigmatism correction, coupling right into a unmarried mode optical fiber, diffractive optics and beam shaping, and manipulation of multi transverse mode beams. the ultimate bankruptcy of the ebook covers beam characterization tools, describing the dimension of spatial and spectral homes, together with wavelength and linewidth dimension ideas.
The ebook is a considerably revised and elevated model of the identify Laser Diode Beam fundamentals, Manipulations and Characterizations by means of a similar writer. New themes brought during this quantity contain: laser diode forms and dealing rules, non-paraxial Gaussian beam, Zemax modeling, numerical research of a laser diode beam, spectral estate characterization tools, and gear and effort characterization innovations. The e-book ways the topic in a realistic approach with mathematical content material saved to the minimal point required, making the ebook a handy reference for laser diode clients.
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Additional info for A Practical Guide to Handling Laser Diode Beams
23f depicts a real situation, where the laser diode cap is well positioned inside a module housing, but the laser diode chip is not at the focal point of the lens because of the manufacturing tolerance. The laser diode chip can be moved to the focal point of the lens by rotating the cap as shown in Fig. 23f, the ﬁnal situation is similar to that shown in Fig. 23b. Rotating laser 24 1 Laser Diode Basics diode cap in any direction can be realized by using three set screws to push the cap, or by using some type of tool.
We are more interested in measuring and correcting the astigmatism. An astigmatic beam is another undesired characteristic of single TE mode laser diodes. 5 Polarization Laser diode beams are linear polarized. The polarization ratio is high from about 50:1 to about 100:1 for single TE mode laser diode, and around 30:1 for wide stripe multi-TE modes laser diodes. The polarization is in the slow axis direction. The high polarization ratio of laser diode beams can be either an advantage or a disadvantage, depending on the type of applications.
One characteristics is the maximum and minimum focusing distance that can be found by differentiating Eq. 10) and assuming Di/Do = 0, we obtain o ¼ f Æ zR ð2:11Þ Plugging o = f + zR into Eq. 10), we can ﬁnd the maximum focusing distance to be imax ¼ f 2zR f þ 2zR f 1 ð2:12Þ Plugging o = f − zR into Eq. 10) we can ﬁnd the minimum focusing distance to be imin ¼ f 2zR f À 2zR f 1 ð2:13Þ zR/f again plays an important role here. For zR/f ) 1, Eqs. 13) reduce to imax = imin = f, which is a focusing situation.