Author: T. Sean Ross
Publisher: SPIE-International Society for Optical Engineering
ISBN: 9780819492975
Category : Laser beams
Languages : en
Pages : 0
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Book Description
The book is geared toward engineers and laser physicists involved in the development of laser-based systems, especially laser systems for directed energy applications. It begins with a review of basic laser properties and moves to definitions and implications of the various standard beam quality metrics such as M2, power in the bucket, brightness, beam parameter product, and Strehl ratio. The practical aspects of beam metrology, which have not been sufficiently addressed in the literature, are amply covered here. For those who are only interested in measuring Gaussian beams from commercial lasers, a reading of Chapter 1, Chapter 2 "What Your Laser Beam Analyzer Manual Didn't Tell You," and the first three sections of Chapter 6 "Cautionary Tales" will be sufficient. For those working in more off-the-map fields such as unique lasers, unstable resonators, multikilowatt lasers, MOPAs, or requirements generation and development, a reading of the entire text is recommended.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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Book Description
Along with power output of the laser system, laser optical quality or beam quality provides a suitable measure of performance. Power and beam quality are standards for the comparison of laser systems with each other and against mission requirements. An understanding of the meaning of beam quality is necessary to completely define laser performance capability. The current state of our community includes a multitude of different and not well understood beam quality measures, M (exp 2), Strehl Ratio, brightness, power in the bucket, "times diffraction limited" and mode content determined by a variety of beam radius measures: half-widths, second-moment radius, widths at 1/e or 1/e (exp 2) points, width of primary lobe, etc. Another complication is that different elements of the community use different measures to evaluate optical quality characteristics. We examine the assumptions behind common measures of beam quality and compare the various measures as they relate to beams from laser employing stable resonant optical cavities. We show how the mode composition of a beam depends on prior determination of beam radius and how the term "times diffraction limited"can mean different things depending on the method used to measure beam radius. We show the ambiguities that arise between certain classes of beams and measures of beam quality and advocate for a laser beam quality standard that relates directly to mission requirements.
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ISBN:
Category :
Languages : en
Pages : 12
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Book Description
Laser beam-quality can indicate the maximum power density that can be obtained with a specific laser and serves as a figure-of-merit when comparing lasers, calibrating lasers, and in assessing a laser's operating condition. Measurements of laser beam-quality for a 1000 watt continuous wave CO2 laser and a 400 watt pulsed Nd:YAG laser have been completed. These measurements were made with two different type instruments: (1) a specially constructed apparatus that uses an integrating sphere and diamond apertures and (2) a commercially available instrument that incorporates a scanning and spinning hollow needle. Laser beam-quality and the propagation constants have been determined using a non-linear curve-fitting technique and the new proposed ISO standard for measuring laser beam-quality. The curve fitting analysis and the ISO analysis were found to produce approximately the same values for beam-quality and the propagation constants. However, a comparison of the experimental procedures required with the two techniques showed significant differences. The utility of the ISO technique was limited by it's experimental procedural restrictions. The importance of spherical aberration in distorting laser beam-quality measurements and in limiting the application of beam-quality to laser spotsize prediction is also detailed.
Author: Wen Ji-Hua
Publisher:
ISBN: 9780819478979
Category : Laser beams
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Author: Nurhalawa Md Yusof
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Book Description
Author: Lionel R. Baker
Publisher: SPIE Press
ISBN: 9780819455765
Category : Technology & Engineering
Languages : en
Pages : 170
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Book Description
This book supplies the optical component and systems designer, and quality assurance engineers and managers with the definitions, measurement principles, and standard metrics used to characterize high-quality specular surfaces. The author covers both the traditional visual methods as well as newer (but not necessarily better) computer-aided techniques and describes the metrics adopted by the new ISO standards, including the setting of form and finish tolerances. Key issues of industry are raised, to help stimulate research and development of new methods and standards that blend the best of the old and new approaches to surface assessment.
Author: Matt Young
Publisher:
ISBN:
Category : Lasers
Languages : en
Pages : 44
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Book Description
Author: Fenghe Zhong
Publisher:
ISBN:
Category :
Languages : en
Pages : 142
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Book Description
Author: Ulrich Viebahn
Publisher:
ISBN: 9780387564180
Category :
Languages : en
Pages : 164
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Book Description
