By Haiyin Sun
This publication bargains the reader a realistic advisor to the regulate and characterization of laser diode beams. Laser diodes are the main established 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 realizing in their exact properties.
Following a brief advent to the operating ideas of laser diodes, the ebook describes the fundamentals of laser diode beams and beam propagation, together with Zemax modeling of a Gaussian beam propagating via a lens. The center of the publication 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 tools, describing the dimension of spatial and spectral homes, together with wavelength and linewidth size thoughts.
The publication is a considerably revised and improved model of the identify Laser Diode Beam fundamentals, Manipulations and Characterizations by way of a similar writer. New subject matters 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 equipment, and gear and effort characterization concepts. The ebook techniques the topic in a realistic approach with mathematical content material stored to the minimal point required, making the booklet a handy reference for laser diode clients.
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Extra info for A Practical Guide to Handling Laser Diode Beams
6 plots Eq. 2) for two laser beams same as the two beams in Fig. 5. It can be seen from Eq. 2) and Fig. 5mm zR2 Asymptote 2 Beam waist 1 θ2 0 0 2 θ1 Wavefronts 4 6 8 10 z (m) Fig. 635 µm and M2 = 1 34 2 Laser Diode Beam Basics Fig. 5mm 1 1 10 10 3 100 10 4 10 5 z (mm) plane wavefront with radius R(0) approaching inﬁnity. As the beam propagates, R (z) gradually decreases. The minimum R(z) appears at z = zR. As the beam continues propagating, the beam wavefront gradually becomes spherical, then R(z) becomes proportional to z.
This means the active layer thickness cannot be increased. Then, the straightforward way to increase the laser power is to increase the active layer width. For laser diodes with power higher than 100 mW or so (depending on the laser diode type and wavelength), the active layer widths are tens of microns or even up to a few hundred microns. Such laser diodes are often called wide stripe laser diodes or broad area laser diodes. The beam emitted from a wide stripe active layer contains multiple TE modes as depicted in Fig.
2. Every TE mode is a quasi-Gaussian mode. All these modes combine to form a multi-TE mode beam. As the beam Fast axis Slow axis a Wide stripe active layer Multi TE mode beam Fig. 2 Multi-transverse Mode Laser Diode Beams 31 Fig. 3 The solid curves are for the spatial intensity distributions of ﬁve TE modes at three propagations distances. a At or near the diode facet. b At ten microns or so from the laser diode facet. c At tens of microns or beyond. The dashed curves are the spatial intensity distribution of ﬁve modes combined.