A Practical Guide to Handling Laser Diode Beams by Haiyin Sun

By Haiyin Sun

This booklet deals the reader a realistic advisor to the keep watch over and characterization of laser diode beams. Laser diodes are the main regular lasers, accounting for fifty% of the worldwide laser industry. right dealing with of laser diode beams is the major to the winning use of laser diodes, and this calls for an in-depth knowing in their distinctive properties.

Following a quick creation to the operating rules 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 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 houses, together with wavelength and linewidth size recommendations.

The booklet is a considerably revised and extended model of the name Laser Diode Beam fundamentals, Manipulations and Characterizations by way of an identical writer. New themes brought during this quantity contain: laser diode forms and dealing ideas, non-paraxial Gaussian beam, Zemax modeling, numerical research of a laser diode beam, spectral estate characterization tools, and gear and effort characterization recommendations. The booklet methods the topic in a pragmatic method with mathematical content material stored to the minimal point required, making the e-book a handy reference for laser diode clients.

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2) are rewritten here for readers’ convenience.   2 0 1=2 M kz w0 ðzÞ ¼ w0 0 1 þ pw0 02 ð2:1Þ    pw0 02 R0 ðzÞ ¼ z0 1 þ M 2 kz0 ð2:2Þ Taking the square of both sides of Eq. 1) and dividing the result by Eq. 3 Laser Diode Beam Propagation 45 Taking the (M2λz′)2/(π w0 02 )2 term out of the parenthesis in the numerator of Eq. 29) and canceling the same terms in the numerator and denominator, Eq. 29) becomes 2   02 2  pw0 1þ M 2 kz0    02 2 pw0 z0 1 þ M 2 kz0  w0 ðzÞ2 ¼ R0 ðzÞ z0 w0 02 2 0 kz w0 02 M pw0 02  2 z0 M 2 k ¼ 02 or p w0 w0 ðzÞ2  p 2 ¼ 0 R ðzÞ M 2 k ð2:30Þ Inserting Eq.

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. 017 mm, which is trivial. The situation shown in Fig. 23b is the most common and the collimated beam is still of good quality. The laser diode chip shown in Fig. 23c–e has transverse position errors that will result in boresight errors in the collimated beam. 02 Radian, which may be an issue in some applications. The boresight error of the chip shown in Fig.

The vertical axis is intensity with arbitrary unit propagates, every mode increases its size and gradually merges with other modes to form a light line in the slow axis direction, as shown in Fig. 2. As the beam further propagates, the beam shape becomes rectangular, because all the modes have larger divergence in the fast axis direction. 3 shows the spatial intensity distribution of five TE modes at three different propagation distances. 3a shows the intensity distribution of the five modes at or near the laser diode facet.

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