Dr. Chun-Chieh Chang Profile

Dr. Chun-Chieh Chang

Scientist at Los Alamos National Laboratory

SPIE Involvement:

Author

Area of Expertise:

Optoelectronics , Quantum Cascade Lasers , Metamaterials , Nanophotonics , Terahertz , Nanofabrication

Publications (6)

Proceedings Article | 20 February 2017 Presentation + Paper

High internal differential efficiency mid-infrared quantum cascade lasers

Dan Botez, Jeremy Kirch, Chun-Chieh Chang, Colin Boyle, Honghyuk Kim, Kevin Oresick, Chris Sigler, Luke Mawst, Minhyeok Jo, Jae Cheol Shin, Gun-Kim Doo, Don Lindberg, Thomas Earles

Proceedings Volume 10123, 101230Q (2017) https://doi.org/10.1117/12.2249537

KEYWORDS: Energy conversion efficiency, Mirrors, Continuous wave operation, Electrons, Scattering, Quantum cascade lasers, Mid-IR, Quantum efficiency, Internal quantum efficiency, Reliability

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Proceedings Article | 10 March 2016 Paper

Step-taper active-region quantum cascade lasers for carrier-leakage suppression and high internal differential efficiency

J. Kirch, C.-C. Chang, C. Boyle, L. Mawst, D. Lindberg, T. Earles, D. Botez

Proceedings Volume 9767, 976713 (2016) https://doi.org/10.1117/12.2209716

KEYWORDS: Quantum cascade lasers, Internal quantum efficiency, Continuous wave operation, Metalorganic chemical vapor deposition, Mid-IR, Electrons, Picosecond phenomena, Mirrors, Scattering, Laser damage threshold

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Proceedings Article | 10 March 2015 Paper

Planarized process for resonant leaky-wave coupled phase-locked arrays of mid-IR quantum cascade lasers

C.-C. Chang, J. Kirch, C. Boyle, C. Sigler, L. Mawst, D. Botez, B. Zutter, P. Buelow, K. Schulte, T. Kuech, T. Earles

Proceedings Volume 9382, 938213 (2015) https://doi.org/10.1117/12.2075667

KEYWORDS: Quantum cascade lasers, Chemical elements, Etching, Indium gallium arsenide, Plasma etching, Wet etching, Polishing, Surface finishing, Array processing, Mid-IR

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Proceedings Article | 10 March 2015 Paper

Destructive physical analysis of degraded quantum cascade lasers

Y. Sin, Z. Lingley, M. Brodie, N. Presser, S. Moss, J. Kirch, C. C. Chang, C. Boyle, L. Mawst, D. Botez, D. Lindberg, Thomas Earles

Proceedings Volume 9382, 93821P (2015) https://doi.org/10.1117/12.2076641

KEYWORDS: Quantum cascade lasers, Transmission electron microscopy, Quantum wells, Failure analysis, Scanning electron microscopy, Chemical analysis, Waveguides, Laser damage threshold, Remote sensing, Reliability

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Remarkable progress made in quantum cascade lasers (QCLs) has led them to find an increasing number of applications in remote sensing, chemical sensing, and free space communications, in addition to potential space applications. However, little has been reported on reliability and failure modes of QCLs although it is crucial to understand failure modes and underlying degradation mechanisms in developing QCLs that meet lifetime requirements for space missions. Focused ion beam (FIB) techniques have been employed to investigate failure modes in various types of laser diodes. Our group has also used FIB to study failure modes in single-mode and multi-mode InGaAs-AlGaAs strained QW lasers, but few groups have used this technique to investigate failure modes in QCLs. In our study, we report on destructive physical analysis (DPA) of degraded InGaAs-InAlAs QCLs using FIB and high-resolution TEM techniques. The active region of QCLs that we studied consisted of two-23 stage layers of InGaAs-InAlAs separated by a 0.5 μm thick InP spacer layer for 8.4μm QCLs and 30-stage layers of lattice-matched InGaAs-InAlAs heterostructure for 4.7μm QCLs. The MOVPE-grown laser structures were fabricated into deep-etched ridge waveguide QCLs. L-I-V-spectral characteristics were measured at RT under pulsed operation. Our 8.4μm QCLs with as-cleaved and HR-coated facets showed a laser threshold of 1.7 A and a threshold voltage of 13 V at RT, whereas our 4.7μm QCLs without facet coating showed threshold currents of 320 - 400 mA and threshold voltages of 13 - 13.5V. Failures were generated via short-term tests of QCLs. FIB systems were used to study the damage area on the front facet and also to prepare TEM cross sections at different locations along the waveguide for defect and chemical analyses using a HR-TEM. In contrast to the COMD damaged area showing as a blister on the front facet of QW lasers, the damaged area of QCLs was significantly extended into the InP substrate due to a much less absorption of lasing photons in QCLs. Our detailed destructive physical analysis results are reported including defect, structural, and chemical analysis results from degraded QCLs.

Proceedings Article | 9 February 2012 Paper

Tapered active-region, mid-infrared quantum cascade lasers for complete suppression of carrier-leakage currents

Dan Botez, Jae Cheol Shin, Jeremy Kirch, Chun-Chieh Chang, Luke Mawst, Thomas Earles

Proceedings Volume 8277, 82770W (2012) https://doi.org/10.1117/12.907439

KEYWORDS: Quantum cascade lasers, Quantum wells, Electrons, Mid-IR, Heatsinks, Picosecond phenomena, Continuous wave operation, Quantum efficiency, Doping

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Proceedings Article | 17 February 2011 Paper

The temperature dependence of key electro-optical characteristics for mid-infrared emitting quantum cascade lasers

Dan Botez, Jae Cheol Shin, Sushil Kumar, Jeremy Kirch, Chun-Chieh Chang, Luke Mawst, Igor Vurgaftman, Jerry Meyer, Alfredo Bismuto, Borislav Hinkov, Jerome Faist

Proceedings Volume 7953, 79530N (2011) https://doi.org/10.1117/12.874197

KEYWORDS: Quantum cascade lasers, Quantum wells, Quantum efficiency, Mid-IR, Heatsinks, Scattering, Electro optics, External quantum efficiency, Continuous wave operation

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Showing 5 of 6 publications

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