Dr. John A. Hoffnagle
Research Scientist at
SPIE Involvement:
Conference Program Committee | Author | Instructor
Area of Expertise:
Atomic and molecular spectroscopy , Laser beam shaping , Geometrical optics
Websites:
Publications (34)

Proceedings Article | 12 May 2016
Proc. SPIE. 9855, Next-Generation Spectroscopic Technologies IX
KEYWORDS: Methane, Switches, Carbon dioxide, Sensors, Calibration, Spectroscopy, Gases, Microsoft Foundation Class Library, Temperature metrology, Absorption

Proceedings Article | 15 October 2012
Proc. SPIE. 8490, Laser Beam Shaping XIII
KEYWORDS: Optical design, Gaussian beams, Wavefronts, Wave propagation, Refraction, Ray tracing, Aspheric lenses, Beam shaping, Geometrical optics, CCD image sensors

Proceedings Article | 15 October 2012
Proc. SPIE. 8490, Laser Beam Shaping XIII
KEYWORDS: Optical components, Monochromatic aberrations, Wavefronts, Collimation, Aspheric lenses, Beam shaping, Optical alignment, Geometrical optics, Tolerancing, Laser systems engineering

Proceedings Article | 16 March 2009
Proc. SPIE. 7274, Optical Microlithography XXII
KEYWORDS: Lithography, Photovoltaics, Lithographic illumination, Diffractive optical elements, Polarization, Manufacturing, Printing, Photomasks, Source mask optimization, Semiconducting wafers

Proceedings Article | 29 August 2008
Proc. SPIE. 7060, Current Developments in Lens Design and Optical Engineering IX
KEYWORDS: Reflectors, Mirrors, Reflection, Wavefronts, Chromium, Refraction, Aspheric lenses, Geometrical optics, Off axis mirrors, Light wave propagation

Proceedings Article | 26 September 2007
Proc. SPIE. 6663, Laser Beam Shaping VIII
KEYWORDS: Diffraction, Lenses, CCD cameras, Ray tracing, Solids, Aspheric lenses, Charge-coupled devices, Beam shaping, Geometrical optics, CCD image sensors

Showing 5 of 34 publications
Conference Committee Involvement (8)
Laser Beam Shaping XI
2 August 2010 | San Diego, California, United States
Laser Beam Shaping X
3 August 2009 | San Diego, California, United States
Laser Beam Shaping IX
11 August 2008 | San Diego, California, United States
Laser Beam Shaping VIII
28 August 2007 | San Diego, California, United States
Laser Beam Shaping VII
13 August 2006 | San Diego, California, United States
Showing 5 of 8 published special sections
Course Instructor
SC565: Introduction to Refractive Laser Beam Shaping Optics
This course covers the design and use of refractive optics to transform the transverse intensity profile of a laser beam. Typically, beam shaping is used to convert the Gaussian profile emitted by a stable resonator or single-mode fiber to a more uniform, flat-top profile, but the formalism used is general enough to accomodate other profile transformations as well. The course describes the advantages of beam shaping and presents an overview of the many possible methods to perform the intensity profile transformation. It procedes to a detailed study of refractive beam shaping, including the choice of a suitable output intensity profile, limitations on beam shaping imposed by diffraction, and the calculation of the necessary aspheric refractive surfaces. Finally, we discuss practical issues pertaining to the use of beam shaping optics, such as input beam preparation, alignment of the beam shaping elements, diagnostics, propagation effects, dispersion, and the resizing and relaying of the output beam.
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