• Title/Summary/Keyword: Nd:YAG

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Output Characteristics of the Longitudinally Pumped 946 nm Nd:YAG Laser with Laser Diode (반도체 레이저로 종펌핑하를 946 nm Nd:YAG 레이저의 출력 특성)

  • Park, Cha-Gon;Choo, Han-Tae;Kim, Gyu-Ug
    • Korean Journal of Optics and Photonics
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    • v.18 no.4
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    • pp.270-273
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    • 2007

  • We have investigated the output characteristics of the 946 nm Nd:YAG laser which is longitudinally pumped by a fiber coupled laser diode. The temperature of a Nd:YAG crystal mount was kept constant by a controller with thermoelectric cooler. As a result, we measured more intense output at a low temperature, and then the maximum output power was measured to be 870 mW when the pumping power and the temperature were 9.95 W and $5^{\circ}C$, respectively. It appeared that output was decreased above 10 W pump power because of the thermal effects in gain medium.

  • https://doi.org/10.3807/HKH.2007.18.4.270 인용 PDF KSCI

Laser micromachining of micron-size aperture for electron beam microcolumn application using the piezo-switched Nd:YAG laser (Piezo Q-Switched Nd:YAG 레이저에 의한 초미니 전자빔 장치용 Micron-Size Aperture의 레이저 미세가공)

  • 안승준;김대욱;김호섭;최성수
    • Journal of the Korean Vacuum Society
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    • v.8 no.4A
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    • pp.456-460
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    • 1999

  • Experimental studies of laser micromachining on Mo diaphragm using piezo Q-switched Nd:YAZ laser have been performed. Application of miniaturized micorcolumn electron gun arrays as a potential electron beam lithography or portable mini-scanning electron microscope (SEM) application have recently extensively examined. The conventional microcolumn fabrication technique would give a limitation on the minimization of aberration, In this paper, we obtained 20~30 $\mu \textrm m$aperture of laser micromachining on Mo diaphragm using piezo Q-swithed Nd:YAG laser. The geometrical figures, such as the diameter and the preciseness of the drilled aperture are dependent upon the total energy of the laser pulse train, laser pulse width, and the diameter of laser spot in addition to the materials-dependent parameters.

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CW Laser Generation form Nd;YAG Single Crystal Grown by Czochralski Method (Czochralski 방법으로 육성된 Nd:YAG 단결정으로부터 CW mode laser 의 발진)

  • 이상호;배소익;김한태;정수진
    • Proceedings of the Optical Society of Korea Conference
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    • 1997.08a
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    • pp.85-85
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    • 1997

  • Czochralski 방법에 의해 육성된 Nd:YAG 단결정으로부터 CW mode의 1064nm laser를 발진시켰다. 육성된 단결정은 직경 50mm, 길이 120mm 이었으며, Nd 이온 농도는 O.2~0.9at% 이었다. 육성된 단결정 boule로 부터 결정학적 결함부위인 core 및 facet가 없는 양질의 단결정 부위를 Twyman-Green interferometer로 선빌하였다. 추출핀 부위는 절단, 가공, 연마공정 및 코팅 공정을 통해 직경 6.35mm, 길이 lOOmm의 laser rod를 제작하였다. 절단은 core drill, 또는 원통 연삭기를 사용하여 rod 형태로 가공하였으며, 상$\cdot$하면 polishing은 평행도 10", 직각도 5', 평활도 $\lambda$/10 수준까지 실험실에서 자체 가공하여 일반적인 laser 발진용 rod의 spec.을 만족시킬 수 있었다.

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