By Haiyin Sun
This ebook deals the reader a realistic consultant to the keep watch over and characterization of laser diode beams. Laser diodes are the main usual 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 detailed properties.
Following a brief creation to the operating ideas of laser diodes, the booklet 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 e-book covers beam characterization equipment, describing the dimension of spatial and spectral homes, together with wavelength and linewidth dimension options.
The booklet is a considerably revised and improved model of the name Laser Diode Beam fundamentals, Manipulations and Characterizations via an analogous writer. New subject matters brought during this quantity comprise: laser diode forms and dealing ideas, non-paraxial Gaussian beam, Zemax modeling, numerical research of a laser diode beam, spectral estate characterization tools, and tool 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 booklet a handy reference for laser diode clients.
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Additional info for A Practical Guide to Handling Laser Diode Beams
13 a A geometric ray propagates through an optical surface. 21) shows that an optical surface can be described by a 2 × 2 matrix. 13b shows a more general case, a ray propagates through a lens, then x2 is not necessary equal to x1. If a geometric ray propagates through n optical elements, the height and angle of the output ray can be calculated by " xn hn # A1 ¼ C1 B1 A ... n D1 Cn Bn Dn " x1 h1 # ð2:22Þ Each matrix in Eq. 22) describes one optical surface. The process of solving Eq. 22) is much simpler than the process of exhaustively tracing the ray through every optical surface.
7 plots Eq. 3) for a laser beam with Gaussian intensity distribution in an arbitrary cross section perpendicular to the propagation direction of the beam, where I0(z) is normalized to 1. Beam radius is usually deﬁned at either 1/e2 intensity level or at FWHM level. We can ﬁnd from Eq. 59w(z). 7. The percentage of laser energy encircled inside the 1/e2 intensity radius can be calculated by R wðzÞ R0 1 0 eÀ2r 2 =wðzÞ2 rdr 2 eÀ2r2 =wðzÞ rdr Fig. 3 Laser Diode Beam Propagation 35 where r is the radial variable.
Because the beam divergence is larger in the vertical direction, this direction is often called the “fast axis” direction. Then, the horizontal direction is called “slow axis” direction, as shown in Fig. 1. As the beam propagates, the beam size in the fast axis direction will surpass the beam size in the slow axis direction, because the beam divergence is larger in the fast axis direction. The beam shape will become vertically elliptical, as shown in Fig. 1. This phenomenon is unique to laser diode beams.