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Center for Ultrafast Optical ScienceDepartment of Electrical Engineering and Computer Science
Street Address PHONE NUMBER AVAILABLEndrehu@umich.edu
QUALIFICATION SUMMARY
Broad knowledge of optical engineering with solid background in nonlinear optics and fiber optics
8+ years of hands-on experience in theoretical modeling, lasers and amplifiers building and characterizing
Demonstrated skills of problem-solving, quick learning, interpersonal communication, and self-management
EDUCATION
Ph.D. in Electrical Engineering, University of Michigan, Ann Arbor, MI (GPA: 4.0/4.0) August 2015
Research Field: Nonlinear Optical Effects in High Power Fiber Amplifiers (Expected)
M.S. in Photonics and Optoelectronics, National Taiwan University, Taiwan (GPA: 4.0/4.0) June 2008
Research Field: Quasi-Phase-Matching Devices for Optical Parametric Oscillators and RGB Lasers
B.S. in Physics, National Tsing-Hua University, Taiwan (GPA: 3.4/4.0) June 2004
WORK EXPERIENCE
Sep. 2009 Present
PhD Student Researcher, University of Michigan
Designed and built a tunable 10ns-pulse oscillator for seeding a 3-stage high energy fiber amplifier producing up to
500-kW output peak power and demonstrated the following properties of CCC fibers:
1) The suppression of SRS in passive 30-m and 60-m CCC fibers
2) Preservation of the output linear polarization at high peak power with selected input polarization status
Modeled modal instabilities in high power fiber amplifiers, analyzed the dynamical behavior of modal instabilities in
time- and frequency- domain and further proposed a strategy to mitigate TMI with modal loss in CCC Fibers
Modeled and experimentally characterized the linear and nonlinear polarization evolution for coiled CCC fibers
Mathematically proved the modal coupling principle and the bending induced coupling of helical modes in
polygonal-core CCC fibers, predicted a >100 dB/m HOM suppression, and exploited the designable modal dispersion
in a rifled-core fiber to achieve effective single-mode performance
Modeled FWM in passive LMA fibers, discovered the idler loss (<300 dB/m) at Mid-IR wavelength can stabilize and
favor the wavelength conversion to signal, and dissected the requirement and experimental achievability of efficient
FWM wavelength conversion in LMA fibers
Jun 2006 Jun 2009
MS Student Researcher, National Taiwan University
Developed a photolithography process and operated LabVIEW-controlled high-voltage system to fabricated PPLN
and PPLT devices, and optimized the poling status by simulating E-field distribution on metal-coated anisotropic
material. The minimum poled pitch of 7-m linewidth is achieved.
Designed and constructed a QPM optical parametric oscillator (OPO)-based intra-cavity lasers for 1) white light
generation 2) self-doubling OPO and achieved >22.6% conversion efficiency to the 434-nm signal
For industrial prototyping, assembled a SHG intra-cavity green laser using PPLN as gain media
Characterized red/green/blue (RGB) lasers with designed PPLNs/PPLTs as second-harmonic-generation crystals
Developed a 3D finite-difference-time-domain (FDTD) program to calculate the whisper-gallery-modes (WGM) and
Q-factor of triangular submicron cavities and benchmarked with the result calculated by commercial software
Sep 2007 Dec 2010
Teaching Assistant and Grader, National Taiwan University and University of Michigan
Assisted students during office hours, presented course review sessions, evaluated student work and provided
feedback for student improvement
Representative of Academic Society, University of Michigan
Secretary (2014) and Webmaster (2013), Student Chapter of OSA/SPIE Optical Society at the Univ. of Michigan
Executive Officer, ECE Graduate Student Council at the Univ. Michigan, 2013-2014
Session Chair, Engineering Graduate Symposium, Univ. of Michigan, 2012
Journal Paper Reviewer
IEEE Journal of Selected Topics in Quantum Electronics, Optics Express, Chinese Optics Letters
SKILLS
Laser building: Yb-doped high power fiber amplifiers, wavelength- and repetition rate-tunable ns oscillators, optical
parametric oscillators, intra-cavity RGB lasers with PPLN/PPLT as gain media
Optical fiber/crystal processing: Fabrication of fiber end-caps, SM/LMA fiber splicing and cleaving, crystal/fiber
end polishing
Optical measurement: Device transmission characterization using supercontinnum lasers, amplified-spontaneous-
emission sources, or white light sources; polarization measurement using half-wave plates and polarization beam
splitters, ns-pulse characterization using photo-detectors connected to an oscilloscope, M2 measurement using beam
profilers or knife-edge method
Modulation of optical waves: Polarization control using half-wave plates, quarter-wave plates, and polarizers; free-
space and fiber based wavelength-division multiplexing, phase/amplitude control using electro-optic and acousto-
optic modulators
Temperature control of optical systems: Water-cooling systems for fiber lasers and fiber amplifiers, temperature-
controlling systems of non-linear crystals, temperature monitoring using thermal cameras
Optical alignment: Free-space alignment using He-Ne lasers, lateral/height indicators; fiber-to-fiber coupling using
NanoMax flexure stages; alignment of linear optical cavities, free-space acousto-optic modulators, frequency
doublers; beam expanding or shrinking using designed telescopes
Micro-fabrication: Photolithography process, thermal evaporation/sputter, facet polishing, e-gun, scanning electron
microscope, etching
Computer Proficiencies: MATLAB, Mathematica, C, LabVIEW (CLAD-Certified), ZEMAX, R-Soft BeamPROP,
Lumerical FDTD, AutoCAD, Solidworks, Origin, EazyPlot, R, Python, Microsoft Office
PATENT
Lung Han Peng, Chih-Ming Lai, Candidate's Name ang, "Apparatus and Methods for
Converting Laser Energy", US PHONE NUMBER AVAILABLE A1, 19 May, 2011
SELECTED PUBLICATIONS
5 journal papers, 15 conference proceedings published. 4 journal papers in preparation.
Candidate's Name , Michael Haines, "Nonlinear Polarization Switching and Preservation Effects in 55-m Core
Polygonal-CCC Fibers", The Conference on Lasers and Electro-Optics, San Jose, California, U.S.A., May 10 - 15,
2015
Candidate's Name , Almantas Galvanauskas, "Analytical Time-Dependent Theory of Thermally Induced Modal Instabilities
in High Power Fiber Amplifiers", SPIE Photonic West, San Francisco, California, U.S.A., Feb. 2 - 7, 2013
Candidate's Name ng Liu, Thomas Sosnowski, Almantas Galvanauskas,
"Experimental Demonstration of SRS Suppression in Chirally-Coupled-Core Fibers", Advanced Solid State
Photonics, San Diego, California, U.S.A., Jan. 29 - Feb. 1, 2012
C.-M. Lai, I.-N. Hu, Y.-Y. Lai, Z.-X.Huang, L.-H. Peng, A. Boudrioua, A.-H. Kung, "Up-conversion blue laser by
intracavity frequency self-doubling of periodically poled lithium tantalate parametric oscillator", Vol. 35, Issue 2, pp.
160-162, Optics Letters, 2010
HONORS AND AWARDS
Competent Communicator Award, Toastmaster International, 2014
Rackham Conference Travel Grant: Jan. 2012, Feb. 2013, May 2014, May 2015
Member of the Phi-Tau-Phi Scholastic Honor Society of the Republic of China
Student Paper Award, International Conference on Optics and Photonics in Taiwan 2008
Teaching Assistant Award, Electrical Engineering Department, National Taiwan University, 2007
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