By Haiyin Sun
Many optical layout technical books can be found for a few years which often take care of photograph optics layout according to geometric optics and utilizing sequential raytracing process. a few books a bit touched laser beam manipulation optics layout. nevertheless many books on laser diodes were released that generally care for laser diode physics with little pertaining to laser diode beam manipulations and characterizations. There are a few net assets facing laser diode beams. although, those web assets haven't coated sufficient fabrics with sufficient information on laser diode beam manipulations and characterizations. A technical ebook targeting laser diode beam manipulations and characterizations can slot in to the open and supply invaluable details to laser diode clients. Laser Diode Beam fundamentals, Manipulations and Characterizations is focused at the very sensible aspect of the topic, it simply discusses the fundamental physics and arithmetic which are worthwhile for the readers so as to comprehend the topic. This booklet is meant to supply a realistic assistance and connection with these scientists and engineers who're nonetheless new to laser diode functions, and to these undergraduate and graduate scholars who're learning lasers and optics. Readers are anticipated in order to quick and simply locate the main functional and invaluable information regarding laser diodes during this ebook with no the necessity of looking through a sea of data.
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Additional info for Laser Diode Beam Basics, Manipulations and Characterizations
The focal lengths of the two cylindrical lenses are so chosen that after collimation, the beam sizes in the fast and slow axis directions are the same, as shown in Fig. 11. Then the beam is collimated, the elliptical beam shape is circularized, and the astigmatic is corrected. Although the idea shown in Fig. 11 sounds great, it has big problems in reality. First, the large divergent angle of the beam in the fast axis direction requires the cylindrical lens to be aspheric. Aspheric cylindrical lenses are difficult to fabricate, rarely seen and expensive.
16, it’s visually ‘‘dirty’’. Since human eye response to light intensity is nonlinear, the multiple reflection spots and scattering noticeable to human eyes are actually very weak and can be neglected. The quality of the circularized beam in terms of wavefront error is still good, usually with a peak to valley error of \k/4. The micro lens is AR coated, but will still cause about 20 % power loss to the beam. This micro lens is not for retail sale in the market, it’s licensed to Coherent Inc. and Blue Sky Research Inc.
This involves three linear and two angular adjustments. The three linear adjustments are more critical than two angular adjustments. The two transversal adjustments are more critical than the longitudinal adjustment. A high quality x–y–z translation stage is required for the alignment, and some patience and experience are required as well. The practical coupling efficiency is about 50 %. The beam from a CirculaserTM is circular and can be coupled into a single mode fiber with efficiency up to about 80 %.