Mechanical Engineering

Diwakar N. Kedlaya

****, **** ****** **., ***#***, Folsom, CA 95630

Tel: 608-***-**** * E-mail: *******@*****.***

CAREER SUMMARY: Contributed to research, development, and manufacturing in laser diodes, photo-lithography/ablation systems and composite structures for semiconductor/aero/auto industry. In every phase modeling and analysis either analytical or FEA for mechanical, thermo and opto mechanical problems were quintessential. Lead projects, deal with vendors, research and obtain new materials, design module, draw and fabricate according to various standards.

EDUCATION

2002 – 2005

Ph.D. Mechanical Engineering, Rutgers, The State University of NJ, October 2005

Dissertation Topic: “Structural Optimization of Composite Structures Using Multi-Scale Hierarchical Model”

1999 – 2002

M.S. Mechanical Engineering, Rutgers, The State University of NJ, April 2002

Thesis Topic: “Growth of Internal Delamination due to Cumulative Effects of Overloads on Composite Plates Under Cyclic Compression”

1993 – 1997

B.E. Mechanical Engineering, P.E.S. Institute of Technology, Bangalore, India, January 1998, First Class with Honors.

WORK EXPERIENCE (Permanent Resident – No VISA required)

01/08 – Present

Mechanical Engineer

Alfalight Inc., Madison, Wisconsin.

• Project lead for HiBriDS-II (High Brightness Diodes Source) team of 8, in research and development of 1KW of high power surface emitting diodes coupled in 400um fiber. Directly responsible for taking this program from prototype to a 200W DDP (direct diode product) tailored for high volume manufacturing. Opto-mechanical design, FEA for thermal and stress issues, active alignment process development were some of the roles.

• Maintained full responsibility for creating and managing a 500W power dense homogenized heat source program. Took the program from R&D of substrates stack-up (isolation layer, solder, metallization layers, sequence, etc) for diodes with electro-thermal challenges, process issues, and packaging to mass manufacturing with modular design and 2-phase cooling system development.

• Modeling and analysis for wide range of new programs such as, pulsed edge emitting bar based passively cooled solid state laser igniter for wide temperature range, packaging diode lasers for beam quality required for laser printing application, beam-formatting for metal cutting module development, surface emitting diodes in hard-disk heads, etc.

• Developed an active alignment/cold-welding tool with 6 d. o. f. to align surface emitters to 1-2 um accuracy. Active aligning 10W diodes in an array for a 200W SE-DFB (Surface Emitting, Distributed Feedback) lasers coupled in 200um fiber for Fiber laser pumping

• Packaging design of single diode laser, pumped fiber laser and lasers for communication systems.

11/05 – 12/07 Staff Scientist - Development

Anvik Corporation, Hawthorne, New York.

Project lead for team of 7, in building large area 2mm lithography and photoablation system for 20 x 20 in. rigid and flexible substrates.

Mechanical design and integration of Anvik’s large-area sub-micron lithography and photoablation system for 20 x 20 in. substrates. Worked on the design, analysis, manufacture, integration, and testing of key mechanical and opto-mechanical subsystems using SolidWorks. Photoablation mask feature development using AutoCAD.

Robotic substrate handling module with high precision control system and roll handling module development. Millenium II PLC system for multi-module control for opto-mechanical and high precision hex-Scanning stage integration.

Electronic packaging-substrate material modeling. Including semiconductor and flexible composite materials under mechanical and optical loading i.e. photoablation process.

Development of Vacuum Debris Removal System for Anvik’s photoablation system. This includes high-rate particle ejection characterization of composite electronic packaging-substrate materials under high-energy laser plume during photoablation process.

06/05 – 09/05

Research Engineer

Ford Research and Advanced Engineering, Physical and Environmental Sci. Dept.

Fiber characterization in composites, using Raman Spectroscopy. Micrograph generation and analysis of Short Fiber Composites using SEM and ABAQUS

Local strain distribution and modeling of fiber/matrix, crack generation and propagation using digital image correlation techniques

03/02 – 06/05 Engineering Assistant

Advanced Materials and Structures Lab., Mechanical and Aerospace Dept., Rutgers

Micro-mechanical characterization of laminate and woven composites.

Multi-dimensional constrained search space with multi-objective optimization alongside memory model using genetic algorithm.

Out-of-plane displacement and its effects on warping in composite using ESPI.

Optimization of wing of an airplane under static and dynamic loading for optimum lay-up and orientation of fibers in laminate and woven composites. SolidWorks and FLUENT

Modeling of tissues and detection of deeper lesions using custom designed high-pressure waves generator.

05/02 – 07/02 Internship

Anvik Corporation, Hawthorne, New York. (Intel and Airforce projects)

Instrumental in design and development of stage with nano-precision for carrying advanced laser-based microlithography equipment using Solid Works, AutoCAD. These enable production of PCBs, MCMs and other Optoelectronic products.

Involved in high precision visual control system programming and enhancing algorithms for pattern recognition in stage traversal/positioning using Visual C++

01/02 – 05/04 Instructor/Teaching Assistant

School of Engineering and Mechanical and Aerospace Dept., Rutgers

Statics, Measurements and Measurements Laboratory.

08/99 – 08/01 Research Assistant

Advanced Materials and Structures Lab., Mechanical and Aerospace Dept., Rutgers

Semi-Empirical modeling of delamination growth in composites. Fatigue with random overloads simulating the life cycle of airplane wing/skin. Visual Fortran and C++

Nanoscale out-of-plane displacement measurement and its influence on crack growth in stressed composites. Produce, track, de-correlate, mask and map images from Electron Speckle Interferometer to obtain displacement using LABVIEW and C++.

INITIATIVES AND ACCOLADES

Alfalight employee of the year award 2010 for dedication and contribution to research and manufacturing.

Lead 1KW pumping and curved grating lasers pumps – article Photonics Spectra, Compound Semiconductor and Solid state and diode laser review, June, August 2009.

Reviewer, Composites Science and Technology, since July 2006.

Reviewer, ASME Journals, Journal of Engineering Materials and Technology, since June 2005.

Co-Chair, Technical Sessions, Durability and Damage Tolerance of Heterogeneous Materials, ASME International Mechanical Engineering Congress and Exposition, Anaheim, California, November 2004.

Reviewer, ASME Journals, Journal of Engineering Materials and Technology, October 2004

Instrumental in obtaining NSF, ACC (Automotive Composite Consortium) and other grants 2003 – 2007.

Coordinator of voluntary organization”Asha for Education”, Central NJ, Instrumental in raising funds over 40K $ and distributing to deserving projects for under-privileged children, August 2004 – Present.

Personally raised funds over 4K $ for children education by running marathons. November 03 - 07.

Adjudged Second best Project/Paper in Inter-Varsity Technical Meet on "Fabrication & Simulation of CNC Milling Machine", Techniche 1997, PESIT, Bangalore, India.

PATENTS, PUBLICATIONS AND CONFERENCES

“High power diode-pumped 2.7-um Er3+:Y2O3 laser with nearly quantum defect-limited efficiency”, The International Electronic Journal of Optics, Optical Express accepted 04 July 2011, assigned issue, Vol. 9, No. 105, 09 Dec 2011.

“975-nm Surface-Emitting Distributed Feedback (SE-DFB) Laser and Array”, Solid State and Diode Laser Technology Review, Directed Energy Professional Society, Newton, MA, 29 June – 2 July 2009.

“Method of Heatsinking and Heatsink Configurations”, Alfalight Inc., patent pending.

“Method of Beam Formatting for SE-DFB Lasers”, Alfalight Inc., patent pending.

“Design of composites using a generic unit cell model coupled with a hybrid genetic algorithm,” Composites Part A: Applied Science and Manufacturing, Volume 39, Issue 9, pp. 1433-1443, September 2008.

“Nitrogen purging and packaging for barrel lens system in ablation”, Anvik Corporation, patent pending.

“Vacuum Debris removal system”, Anvik Corporation,, patent no. 7795559, Oct. 26, 2007, issued Sept 14, 2010.

“Multi-Scale Hierarchical Model of Composite Structures with Degradation State Variables,” in progress.

“Study on FRCs to model aircraft wing under unsteady aerodynamic loading” IMECE, Anaheim, 2004.

“Optimum Orientation and Lay-up Design of an Composite Airplane Skin”, IMECE, DC, November 2003

“An Electronic Speckle Pattern Interferomentry Adaptive Filter for Warping in Composite Materials,” Journal of Optics and Lasers in Engineering, June 2003

“Fracture Toughness and Stacking Sequence Optimization of Carbon/Glass Fiber with Aluminosilicate Matrix Composites”, International Mech. Eng. Congress and Exposition, New Orleans, November 2002

“Failure Prediction of Graphite/Epoxy Laminates with Induced Intermittent Load Surge During Fatigue”, Vol. 50, No. 19, pp. 4813-4821, Acta Materialia, November 2002

“Deflection Measurements of Laminated Thin Plates Using Electronic Speckle Pattern Interferometry,” Journal of Composites Technology & Research, JCTRER, Vol. 24, No. 4, pp. 215-223, October 2002.

“Failure Prediction of Graphite/Epoxy Laminates with Induced Intermittent Load Surge During Fatigue”, ASME International Mechanical Engineering Congress & Exposition, November 2001

“On the Energy Release rate of Fatigued Composites subjected to Compressive Overloads”, Journal Of Engineering Materials and Technology, Vol. 122, No. 4, pp. 443-449, October 2000.

“Numerical Investigation of Fatigued Composites under Cyclic Compression Spectra”, International conference on Fracture, 10th Proceedings, Honolulu, Hawaii, CD, 2001.

“Failure Prediction of Graphite/Epoxy Laminates with Induced Intermittent Surge in Applied Load During Fatigue”, 2001 International Mechanical Engineering Congress & Exposition, ASME, Vol 3, November 11-16, 2001 New York

“Semi-Empirical modeling of the effects of randomized overloading under cyclically loaded specimen affecting the crack growth rate and energy release” ASTM journal publication.

PROJECTS HIGHLIGHTING MULTI-DISCIPLINARY SKILLS

Evolutionary Algorithms – Modified Genetic Algorithm alongside memory model for discrete, huge search space with multiple objective and constraints, evaluation of its efficiency and effectiveness, C++

Design of Experiments – Setting up of composite mode I, II experiments with conventional DOE methods and Response surface methodology and determine its cost and effectiveness. C++ and SAS

Electron Speckle Interferometry – Out-of-plane growth detection of specimen. Setting up beams, extraction of fringes, automated de-correlating and calibration. Real time processing of fringes using morphological techniques as a feedback for failure in experiments. G++, LABVIEW and Matlab

Face Detection – Detection of face (skin) color over the frames in the form of JPEG or MPEG by learning techniques and blob characterization/detection using computer vision algorithms. C++ and Matlab.

Control of SMA – PID control of Shape memory alloy under the influence of heat, which acts as an excellent actuator. Comparison of experimental results with the analytical model. Visual C++ and Matlab.

Heat Transfer over a solid being modeled for different boundary conditions adopting square meshes by finite difference method and FEM, comparison of analytical result for real time applications. Maple and C.

Wire frame Modeling – Representing objects in a 3D space over 2D frame from any particular viewpoint. Building a graphic collection, right from elements, piling up to surfaces to represent solids. GCC.

Random Load due to earthquake and its effects on structures - Designing the system by reducing the complexity and representing the model evolved in form of a mathematical equation and studying its effects on structures.

Fabrication and Simulation of CNC Milling Machine - Fabrication of a mechanical setup for four degrees of freedom, actuating the guideways through interface cards and finally offering an interactive program with simulation, for operation. Borland C++.

COMPUTER SKILLS

Solid Works, I-DEAS MATLAB C, C++ & Visual C++

Ansys, Fluent Maple, Pagemaker Visual Basic

AutoCAD ABAQUS FORTRAN 77

Virtual Eng. Labview Java and HTML

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