By Haiyin Sun
This e-book deals the reader a pragmatic consultant to the regulate and characterization of laser diode beams. Laser diodes are the main standard lasers, accounting for fifty% of the worldwide laser marketplace. right dealing with of laser diode beams is the most important to the profitable use of laser diodes, and this calls for an in-depth knowing in their special properties.
Following a quick creation to the operating ideas of laser diodes, the e-book 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 e-book 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 publication covers beam characterization equipment, describing the size of spatial and spectral homes, together with wavelength and linewidth size strategies.
The e-book is a considerably revised and extended model of the name Laser Diode Beam fundamentals, Manipulations and Characterizations via an analogous writer. New issues 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 publication methods the topic in a pragmatic means with mathematical content material stored to the minimal point required, making the ebook a handy reference for laser diode clients.
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Extra info for A Practical Guide to Handling Laser Diode Beams
1, the active layer is one rectangular shaped waveguide or several rectangular shaped waveguides in parallel. TE modes of such active layers are not exactly Gaussian modes. The gain inside the active layer and the loss outside the active layer will also affect the mode shapes. There are many different active layer structures. The TE modes from these active layers are slightly different. There is no single mathematical model that can accurately describe all these modes and no commonly accepted relationship linking laser diode types to the shapes of their TE modes.
1 ABCD Matrix Method A geometric ray propagating through optical elements can be conveniently analyzed by ABCD matrix method . Below we consider a simple example. As shown in Fig. 13a, a ray propagates from a medium with index n1 to another medium with index n2. The interface of these two media is planar. The input ray can be described by its height x1 when it hits the optics surface and its angle θ1 to the optical axis. Similarly, the output ray can be described by its height x2 when it leaves the optics surface and its angle θ2 to the optical axis.
4 zR/f = 1 m 5 0 −1 0 3 o/f the beam is relayed. From Eq. 14) we can see that w0′/w0 = 1 can appear for various combinations of o/f and zR/f. It can be seen that for zR/f → 0, the Gaussian beam reduces to a point source and Eq. 14) reduces to Eq. 9). 14) is plotted in Fig. 11 with zR/f being a parameter. We can see from Fig. 11 that for any zR/f values, m peaks at o/f = 1. For o/f = 1, m is larger for smaller zR/f, since this is a collimation situation, a smaller waist size incident beam means larger divergence and larger waist size of collimated beam.