• Journal of the Korean Society for Precision Engineering
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• v.27 no.6
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• pp.17-23
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• 2010

Recent research topics of ultra-precision micro, nano machining using femtosecond lasers are described in the paper.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.188-191
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• 2005

A common feature in various methods of optical interferometry for absolute distance measurements is the use of multiple monochromatic light components either in sequence or in parallel at the same time. Two or multiple wavelength synthesis has been studied though its performance is vulnerable to the frequency instability of the light source. Recently continuous frequency modulation is considered a promising method with availability of wide band tunable diode lasers, which also have frequency instability errors. We can lock frequencies of these third-party light sources to the modes of the femtosecond laser which is stabilized to the precision of the standard radio frequency. To this end, we have stabilized all the modes of the femtosecond laser to the atomic frequency standard by using powerful tools of frequency-domain laser stabilization.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.204-207
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• 2005

We discuss two possibilities of using femtosecond pulse lasers as a new interferometric light source fer enhanced precision surface profile metrology. First, a train of ultra-fast laser pulses yields repeated low temporal coherence, which allows performing unequal-path scanning interferometry that is not feasible with white light. Second, high spatial coherence of femtosecond pulse lasers enables to test large size optics in non-symmetric configurations with relatively small size reference surfaces. These two advantages are verified experimentally using Fizeau and Twyman-Green type scanning interferometers.

• Electronics and Telecommunications Trends
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• v.36 no.5
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• pp.1-8
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• 2021

Over the last three decades, the development of Ti:sapphire femtosecond lasers has led to advancements in scientific and industrial fields. In particular, these advanced lasers show great potential for applications with bio-imaging and medical surgery, such as two-photon microscopy, nonlinear Raman microscopy, optical coherence tomography, and ophthalmic surgery. Herein, we present a detailed description of the theoretical and experimental physics of Kerr-lens mode-locked femtosecond Ti:sapphire lasers and its two-photon microscopy.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.11a
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• pp.367-368
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.875-876
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• 2012

• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.273-274
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• 2009

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.254-254
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• 2003

• Proceedings of the Optical Society of Korea Conference
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• 2005.02a
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• pp.48-49
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• 2005

• Proceedings of the Korean Ceranic Society Conference
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• 2004.04b
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• pp.34.4-34.4
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• 2004