Dr. James P. Siepmann Profile

Dr. James P. Siepmann

Deceased

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Proceedings Article | 19 May 2006 Paper

Fusion of current technologies with real-time 3D MEMS ladar for novel security and defense applications

James Siepmann

Proceedings Volume 6214, 621409 (2006) https://doi.org/10.1117/12.665349

KEYWORDS: LIDAR, Microelectromechanical systems, Mirrors, Staring arrays, Electromagnetism, Global Positioning System, Optics manufacturing, Photons, Image resolution, Defense technologies

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Through the utilization of scanning MEMS mirrors in ladar devices, a whole new range of potential military, Homeland Security, law enforcement, and civilian applications is now possible. Currently, ladar devices are typically large (>15,000 cc), heavy (>15 kg), and expensive (>$100,000) while current MEMS ladar designs are more than a magnitude less, opening up a myriad of potential new applications. One such application with current technology is a GPS integrated MEMS ladar unit, which could be used for real-time border monitoring or the creation of virtual 3D battlefields after being dropped or propelled into hostile territory. Another current technology that can be integrated into a MEMS ladar unit is digital video that can give high resolution and true color to a picture that is then enhanced with range information in a real-time display format that is easier for the user to understand and assimilate than typical gray-scale or false color images. The problem with using 2-axis MEMS mirrors in ladar devices is that in order to have a resonance frequency capable of practical real-time scanning, they must either be quite small and/or have a low maximum tilt angle. Typically, this value has been less than (< or = to 10 mg-mm²-kHz²)-degrees. We have been able to solve this problem by using angle amplification techniques that utilize a series of MEMS mirrors and/or a specialized set of optics to achieve a broad field of view. These techniques and some of their novel applications mentioned will be explained and discussed herein.

Proceedings Article | 28 February 2006 Paper

Scalable passively mode-locked semiconductor lasers for microprocessor clocking

James Siepmann, Adam Rybaltowski

Proceedings Volume 6115, 611504 (2006) https://doi.org/10.1117/12.640882

KEYWORDS: Mode locking, Semiconductor lasers, Clocks, Pulsed laser operation, Reflectivity, Absorption, Modulation, Copper, Laser development, Coating

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The integration of photonic clocking in microprocessors is anticipated to occur during the 2008-2012 high-volume manufacturing (HVM) cycle. Though photonic clocking can be achieved through electronic modulation or actively mode-locking a laser, a more cost-effective and better solution would be to use internal cavity passively mode-locked semiconductor lasers. Not only do these lasers offer low-cost, simplicity, and ease of integration, but prototypes that are amenable to HVM are currently available. We present such a laser that is scalable by design to clock rates of 9 to hundreds of GHz and wavelengths in the 800 to 1100+ nm range. These lasers utilize internal saturable absorber(s) to passively mode-lock a semiconductor laser with relatively high peak powers. Experimental results from these lasers show an RF spectrum signal peak that is at least 40 dB above the noise floor with a -10 dB width of <1 MHz. The RMS jitter as determined by an oscilloscope with a precision timebase module was found to be ~1 ps which is among the best for this type of laser. Autocorrelation was used to confirm mode-locking and pulse width. In addition to experimental data, a theory and discussion on how the different characteristics of these lasers can be tailored for various commercial applications such as microprocessor clocking will be presented.

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