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Phase-sensitive imaging of diffracted light by single nanoslits: measurements from near to far field
Kihm, Hyun-woo,Kihm, Q. H.,Kim, D. S.,Ahn, K. J.,Kang, J. H. The Optical Society 2010 Optics express Vol.18 No.15
<P>We perform phase-sensitive imaging of optical wavefront emanating from a single nanoslit and propagating into free space by using scattering type near-field scanning optical microscope combined with an optical interferometer. By analyzing polarization resolved optical amplitudes and phases, the propagation directions of surface waves are determined and the phase difference between two orthogonal polarization components of the surface wave are discussed for increasing distance from the slit.</P>
Double-pass point diffraction interferometer
Kihm, Hagyong,Lee, Yun-Woo IOP Pub 2010 Measurement Science and Technology Vol.21 No.10
<P>We propose a new point diffraction interferometer for qualitative optical analysis. Point diffraction is made two times to generate interfering waves with a single pinholed polarizer. Diffraction from a pinholed polarizer makes reference and measurement waves with a double-pass configuration. A quarter-wave plate rotates their polarization angles after reciprocation. The interferogram between the diffracted–undiffracted measurement wave and the undiffracted–diffracted reference wave is vibration-insensitive due to a common-path configuration. We examined its capability by changing the pinhole size and divergence angle of the diffracted wave for test optics with various numerical apertures.</P>
Utilizing virtual vibration tests to optimize physical endurance tests
Kihm, Frederic Techno-Press 2018 Advances in aircraft and spacecraft science Vol.5 No.2
Physical tests are performed at various stages of the development cycle of a product, from prototype validation to product qualification. Although costly, there are growing demands for qualification tests like endurance vibration testing to be more representative of the real world. At the same time there are growing demands to assess the durability of these items based on FEA simulation. In this paper, we will explain how to set up a CAE-based test and how to correlate the results with some physical measurements. Specific assumptions will be explained and some advantages of using virtual tests will be highlighted such as the reduction of the number of prototypes needed, investigations on failures, evaluation of the level of reliability via sensitivity analysis, evaluation of the margins are at the end of a successful test. This presentation will therefore focus on explaining and showing how virtual tests can enrich the exploitation of physical tests.
Fiber-diffraction interferometer for vibration desensitization.
Kihm, Hagyong,Kim, Seung-Woo Optical Society of America 2005 Optics letters Vol.30 No.16
<P>We describe a new interferometer designed to obtain high immunity to vibration by generating the reference wave by means of fiber diffraction so as to share a common path with the measurement wave. A spatial phase shifter is added to secure vibration desensitization by capturing four phase-shifted interferograms simultaneously without time delay. Experimental results prove that the proposed interferometer is capable of providing stable measurements with a level of fringe stabilization of less than 1 nm in a typical workshop environment equipped with no excessive ground isolation for antivibration.</P>