A Practical Guide to Handling Laser Diode Beams by Haiyin Sun

By Haiyin Sun

This ebook deals the reader a realistic advisor to the keep an eye on and characterization of laser diode beams. Laser diodes are the main ordinary lasers, accounting for fifty% of the worldwide laser industry. right dealing with of laser diode beams is the major to the profitable use of laser diodes, and this calls for an in-depth knowing in their exact properties.

Following a brief creation to the operating ideas 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 e-book 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 equipment, describing the dimension of spatial and spectral houses, together with wavelength and linewidth dimension innovations.

The publication is a considerably revised and elevated model of the name Laser Diode Beam fundamentals, Manipulations and Characterizations through 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 suggestions. The booklet ways the topic in a realistic approach with mathematical content material stored to the minimal point required, making the publication a handy reference for laser diode clients.

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From the application point of view, there 30 2 Laser Diode Beam Basics is no need to study the origin of the astigmatism. We are more interested in measuring and correcting the astigmatism. An astigmatic beam is another undesired characteristic of single TE mode laser diodes. 5 Polarization Laser diode beams are linear polarized. The polarization ratio is high from about 50:1 to about 100:1 for single TE mode laser diode, and around 30:1 for wide stripe multi-TE modes laser diodes. The polarization is in the slow axis direction.

When we type in 0, the beam waist is set at surface 1 and is at the focal plane of the paraxial lens, a negative value here means the beam waist is at the left side of the surface. Since the Rayleigh range of this beam is much smaller than the focal length of the lens, this is a collimating situation, as explained in Sect. 4. For a skew Gaussian beam, the beam behaves differently in the x-z and y-z planes. 4 Zemax Modeling of a Gaussian Beam … 47 Fig. 16 Content of table box Paraxial Beam Settings after typing in all the data and clicking Update circular Gaussian beam modeled here, the orientation does not matter, we randomly choose Y-Z in the Orient box.

It appears to be more convenient to buy lenses from these distributors. Below is an incomplete list of distributors: Edmund Optics Optima Precision Thorlabs There are many different aspheric lenses in the market. Most of them are designed for other applications and will not well collimate laser diode beams. Users should be fully aware of this fact and only use those lenses specially designed for collimating or focusing laser diode beams. References 1. : Chapter 3 Coupled-Mode Theory of DFB Laser Diodes, Handbook of Distributed Feedback Laser Diodes.

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