By Haiyin Sun
This ebook bargains the reader a pragmatic advisor to the keep watch over and characterization of laser diode beams. Laser diodes are the main primary lasers, accounting for fifty% of the worldwide laser industry. 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 creation to the operating rules 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 worried 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 houses, together with wavelength and linewidth dimension suggestions.
The e-book is a considerably revised and increased model of the identify Laser Diode Beam fundamentals, Manipulations and Characterizations by means of an identical writer. New subject matters brought during this quantity comprise: laser diode varieties and dealing ideas, non-paraxial Gaussian beam, Zemax modeling, numerical research of a laser diode beam, spectral estate characterization equipment, and tool and effort characterization recommendations. The e-book techniques the topic in a pragmatic method with mathematical content material stored to the minimal point required, making the publication a handy reference for laser diode clients.
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Additional info for A Practical Guide to Handling Laser Diode Beams
Adjusting the transverse position of a laser diode cap is more complex, we explain the details in Fig. 23. The drawings in Fig. 23 are not to the right proportion for illustration purpose. 23a shows the ideal situation, with the laser diode chip at the focal point of the lens and with no boresight error. 23b shows a less ideal situation, the laser diode chip is at the focal point of the lens, but has a boresight error. It is noted the collimated beam does not have a boresight error, but has a small transverse displacement and is more truncated at one side.
5). We know that Eq. 5) itself is a paraxial approximation and we are now talking about the inaccuracy of paraxial Gaussian model. But it is still adequate to use Eq. 5) to provide a criterion for assessment. Combining Eqs. 16) to eliminate w0 and converting θ from radian to degree, we obtain two conditions in terms of degree 2h [ 21 or 2hFWHM [ 12:4 ð2:17Þ for paraxial Gaussian model deviates appreciably from the exact solution and 2h [ 42 or 2hFWHM [ 24:7 ð2:18Þ for paraxial Gaussian model considerably differs from the exact solution.
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.