By Haiyin Sun
This ebook bargains the reader a pragmatic advisor to the keep an eye on 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 main to the profitable use of laser diodes, and this calls for an in-depth figuring out 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 booklet 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 equipment, describing the dimension of spatial and spectral houses, together with wavelength and linewidth dimension suggestions.
The publication is a considerably revised and multiplied model of the identify Laser Diode Beam fundamentals, Manipulations and Characterizations via an identical writer. New themes brought during this quantity contain: laser diode kinds and dealing ideas, non-paraxial Gaussian beam, Zemax modeling, numerical research of a laser diode beam, spectral estate characterization equipment, and gear and effort characterization ideas. The publication ways the topic in a realistic method 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
001, Eq. 12) reduces to imax ≈ f2/2zR ≈ 500f * 1 m, and Eq. 13) reduces to imin ≈ −f2/2zR ≈ −500f * −1 m. The negative value of imin indicates that 38 2 Laser Diode Beam Basics the laser beam outgoing from the lens has an imaginary waist on the left-hand side of the collimation lens. The waist of a collimated laser diode beam is a few millimeters, the zR of such a collimated beam is several meters. When this collimated laser diode beam is focused by a lens with a focal length of several millimeters, we have zR/f * 1000, Eqs.
It is difﬁcult to ﬁnd the mode structure details in these beams, since the unavoidable measurement errors often lead to inconclusive results. A practical way of handling such laser beams is to neglect the mode structure details, assume the beams still have Gaussian intensity distributions, and introduce a M2 factor to the beams [6, 7]. By deﬁnition, M2 = 1 means the beam is a perfect basic mode Gaussian beam. M2 ≥ 1 means the beam deviates from a basic mode Gaussian beam. 9 plot Eqs. 2, respectively.
ZR/f is an important parameter in Eq. 10). For zR/f → 0, Eq. 10) reduces to Eq. 8), which means such a laser beam can be treated as geometric rays emitted by a point source. For zR/f → ∞, Eq. 10) leads to i = f, the laser beam is focused at the focal point of the lens. 10) has some interesting characteristics that are different from those of Eq. 8). 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.
A Practical Guide to Handling Laser Diode Beams by Haiyin Sun