• 한국세라믹학회지
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• 제30권8호
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• pp.643-650
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• 1993

NdAl3(BO3)4 have been developed for miniature solid state laser material. Single crystals of NdAl3(BO3)4 were grown by TSSG technique using BaB4O7 flux. The effects of growth conditions such as cooling rate, seed orientation and rotation speed on crystal quality and the morphology were studied. At the cooling rate of 2.4$^{\circ}C$/day and the crystal rotation speed of 30~40rpm with the seed orientation in <201> or <100> directions, transparent and light violet colored crystals in size of 10$\times$15$\times$20㎣ with well developed {010}, {111}, {111}, {021}, {001}, {102}, {112}, {021} faces were obtained. By X-ray diffraction analysis, the space group was determined as C2/c, and the X-ray powder data was obtained.

• Bulletin of the Korean Chemical Society
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• 제14권1호
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• pp.72-78
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• 1993

The application of time-resolved laser induced fluorescence spectroscopy (TRLIF) to the complexation studies of Eu(III) and Cm(III) with humic substances is described. Using this method, three different spectroscopic characteristics(excitation spectra, emission spectra, and lifetimes) of these aquo ions and their complexes can be directly measured. By observing shifts in the wavelength and changes in the lifetime and intensities of the fluorescence emission, the information on the complexation behavior of humic substances with these trivalent metal cations in an aqueous solution, as well as energy transfer mechanisms, can be obtained. In addition, this method allows precise spectroscopic quantification of the complexation processes at very low concentrations of both components.

• 한국광학회:학술대회논문집
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• 한국광학회 1991년도 제6회 파동 및 레이저 학술발표회 Prodeedings of 6th Conference on Waves and Lasers
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• pp.172-176
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• 1991

4d 전이원소인 rhodium을 phosphate 유리에 첨가하여 광흡수 및 photoluminescence 스펙트럼을 측정하였다. 이로써 rhodium 이온의 tunable solid state laser용의 광활성 이온으로서의 가능성을 조사하였다.

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 하계학술발표회
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• pp.92-93
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• 2001

• 한국광학회:학술대회논문집
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• 한국광학회 2004년도 제15회 정기총회 및 동계학술발표회
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• pp.158-159
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• 2004

• Journal of Welding and Joining
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• 제27권4호
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• pp.18-25
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• 2009

See Full Text

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.275-276
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• 2011

We have investigated the holographic grating formation on Ag-doped amorphous chalcogenide As2Se3 thin films with Ag layer. The basic optical parameter which is a refractive index and extinction coefficent was taken by n&k analyzer. The source of laser was selected based on these parameter. Holographic gratings have been formed using He-Ne laser (wavelength: 632.8 nm) Diode Pumped Solid State laser (DPSS, wavelength: 532.0 nm) under [P:P] polarized the intensity polarization holography. The diffraction efficiency was obtained by +1st order intensity.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 1995년도 특별강연 및 추계학술발표 개요집
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• pp.208-211
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• 1995

Five cast gamma titanium aluminides, Ti-45~48%Al-2%Nb-2%Cr (nominal composition in at. %), were laser welded and their weld cracking susceptibilities were evaluated. Laser power, traversing rate and preheat temperature were systematically varied to generate a series of welds exhibiting a wide range of cooling rate ($100^{\circ}C/s-10,000^{\circ}C/s$). As Al content increased and the weld cooling rate decreased, solidification cracking susceptibility increased while solid-state cracking susceptibility decreased. Through laser beam energy input control and preheat, it was determined possible to produce high quality laser welds.

• Bulletin of the Korean Chemical Society
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• 제26권12호
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• pp.1991-1995
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• 2005

Sensitivity factors of elements by a glow discharge mass spectrometry (GD-MS) were intensively investigated and compared with a laser ablation inductively coupled plasma-mass spectrometry (ICP-MS). In case of copper matrix, the sensitivity factor by GD-MS generally decreases with the increase of the mass number of element. The details are a little different between each data measured by Faraday and multiplier detectors. The factor by a multiplier detector drastically decreases with the mass increase in the region of low mass as in Faraday detector’s case, but slowly in the high mass region. On the contrast, the sensitivity factor of solution standard by a conventional ICP-MS slowly increases with the increase of elemental mass number even though there are some exceptions such as gold and also the sensitivity factor by a laser ablation ICP MS generally increases with mass number of element in the specimen of glass type. In case of steel matrix, any definite trends could not be shown in the relationship between the GD-MS’s sensitivity factor and elemental mass.

• 대한기계학회논문집 C: 기술과 교육
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• 제5권1호
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• pp.53-61
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• 2017

광기술은 차세대 산업 분야에서 기계, 전자와의 융합을 통한 첨단 산업의 핵심요소이다. 또한 광기술은 현재 신성장동력인 IT, 디스플레이, 자동차, 의료, 반도체 등 국내 기간산업 제품의 품질 및 기능을 향상시켜 고부가 가치를 창출할 수 있는 기초 원천 핵심 기술 및 응용 기술로 활용되고 있으며, 향후 첨단 산업 분야에서 광기술 활용도는 더욱 더 높아질 것으로 예상되고 있다. 본 논문에서는 오늘날 산업 분야에서 중요도가 점차 높아지고 있는 광기술의 발전 동향을 21 세기 기계 산업과 관련하여 설명한다. 특히 다양한 광기술 분야 중에서 보다 기계산업과 관련성이 높은 반도체 조명, 광계측, 산업용 레이저 및 레이저 가공 기술을 중심으로 발전 동향을 살펴본다.