• Title/Summary/Keyword: High Power Diode Laser

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Design and Simulation of an 808 nm InAlAs/AlGaAs GRIN-SCH Quantum Dot Laser Diode

  • Chan, Trevor;Son, Sung-Hun;Kim, Kyoung-Chan;Kim, Tae-Geun
    • Journal of the Optical Society of Korea
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    • v.15 no.2
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    • pp.124-127
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    • 2011
  • Quantum dots were designed within a GRIN-SCH(Graded index - Separate confinement Heterostructure) heterostructure to create a high power InAlAs/AlGaAs laser diode. 808 nm light emission was with a quantum dot composition of In0.665Al0.335As and wetting layer composition of Al0.2Ga0.8As by LASTIP simulation software. Typical characteristics of GRIN structures such as high confinement ratios and Gaussian beam profiles were shown to still apply when quantum dots are used as the active media. With a dot density of 1.0x1011 dots/cm2, two quantum dot layers were found to be good enough for low threshold, high-power laser applications.

A study on Driver module for a high-power pulsed laser diode (고출력 펄스 반도체 레이저의 드라이버 모듈에 관한 연구)

  • Jung, In-Suk;Kim, Ho-Seong
    • Proceedings of the KIEE Conference
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    • 1999.11d
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    • pp.1078-1080
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    • 1999
  • A laser pulse generator which consists of charging resistor, energy storage capacitor laser diode, and switching elements was designed in order to generate 15ns, 20W laser pulses. And the effects of performances of SCR and FET as switching elements are compared. When SCR is used, the SCR's low maximum voltage makes the circuit so complicated, and when FET is used, the FET needs the special sate driver which improves the FET's operation.

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Thermal Stress Relief through Introduction of a Microtrench Structure for a High-power-laser-diode Bar (높은 광출력을 갖는 Laser Diode Bar의 열응력 개선: 마이크로-홈 도입을 통한 응력 분포 변화 분석)

  • Jeong, Ji-Hun;Lee, Dong-Jin;O, Beom-Hoan
    • Korean Journal of Optics and Photonics
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    • v.32 no.5
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    • pp.230-234
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    • 2021
  • Relief of thermal stress has received great attention, to improve the beam quality and stability of high-power laser diodes. In this paper, we investigate a microtrench structure engraved around a laser-diode chip-on-submount (CoS) to relieve the thermal stress on a laser-diode bar (LD-bar), using the SolidWorks® software. First, we systematically analyze the thermal stress on the LD-bar CoS with a metal heat-sink holder, and then derive an optimal design for thermal stress relief according to the change in microtrench depth. The thermal stress of the front part of the LD-bar CoS, which is the main cause of the "smile effect", is reduced to about 1/5 of that without the microtrench structure, while maintaining the thermal resistance.

High Power Laser Diode Technology for Industrial LASER Applications

  • Han, Su-Uk;Im, Ju-Yeong;Kim, Jeong-Ho;Sin, Seung-Hak;Im, Jeong-Un;Lee, Sang-Jun
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.02a
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    • pp.121-121
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    • 2013
  • 최근 산업에서 이슈화되고 있는 고출력산업용레이저를 위한 반도체다이오드레이저 기술에 대한 산업적 관점을 소개하고자 한다. 열효율이 높고 및 비접촉 제어가 가능한 고출력다이오드에 대한 전반적인 소개와 함께, 왜 각광을 받고 있는지를 진단하며, 이러한 고출력레이저다이오드를 제작하는 방법에 관한 고찰을 하고자 한다. 특히 박막생성기술을 위한 장비 기술에 대해 소개하며, MBE와 MOCVD에 대해 비교하고자 한다. 실제적인 고출력레이저 다이오드제작을 위한 측정 및 신뢰성 기술에 대해서 소개하며, 한국광기술원에서 수행하고 있는 산업용 레이저 핵심부품 모듈 국산화 기반구축사업에 대한 소개를 하고자 한다. 한국광기술원 레이저 개발 내용 중 고출력다이오드레이저 개발을 위한 장비 소개 및 기술 소개를 하고자 한다.

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Heat Treatment Characteristics of a Press Draw Mold by Using High Power Diode Laser (고출력 다이오드 레이저를 이용한 프레스 드로우금형의 열처리 특성)

  • Hwang, Hyun-Tae;So, Sang-Woo;Kim, Jung-Do;Kim, Young-Kuk;Kim, Byeong-Hun
    • Journal of the Korean Society for Heat Treatment
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    • v.22 no.6
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    • pp.339-344
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    • 2009
  • Recently, Laser surface treatment technologies have been used to improve wear charactenitics and fatigue resistance of metal molding. When the laser beam is irradiated on the surface and laser speed is appropriate, the laser focal position is rapidly heated and the thermal energy of surface penetrates the material after irradiation, finally imbuing it with a new mechanical characteristic by the process of self-quenching. This research estimates the material characteristic after efficient and functional surface treatment using HPDL, which is more efficient than the existing CW Nd:YAG laser heat source. To estimate this, microstructural changes and hardness characteristics of three parts (the surface treatment part, heat affect zone, and parental material) are observed with the change of laser beam speed and surface temperature. Moreover, the depth of the hardened area is observed with the change of the laser beam speed and temperature. From the results of the experiments, it has been shown that the maximum hardness is approximately 788Hv when the heat treatment temperature and the travel speed are $1150^{\circ}$ and 2 mm/sec, respectively.

Heat Treatment Characteristics of Press Blanking Die by Using High Power Diode Laser (고출력 다이오드 레이저를 이용한 프레스 전단금형의 경화특성)

  • Hwang, Hyun-Tae;So, Sang-Woo;Hwang, Jae-Hyun;Kim, Jong-Do
    • Journal of the Korean Society for Heat Treatment
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    • v.23 no.5
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    • pp.257-262
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    • 2010
  • Recently, metal molding has become essential not only for automobile parts, but also mass production, and has greatly influenced production costs as well as the quality of products. Its surface has been treated by carburizing, nitriding and induction hardening, but these existing treatments cause considerable deformation and increase the expense of postprocessing after treatment; furthermore, these treatments cannot be easily applied to parts that requiring the hardening of only a certain section. This is because the treatment cannot heat the material homogeneously, nor can it heat all of it. Laser surface treatment was developed to overcome these disadvantages, and, when the laser beam is irradiated on the surface and laser speed is appropriate, the laser focal position is rapidly heated and the thermal energy of surface penetrates the material after irradiation, finally imbuing it with a new mechanical characteristic by the process of self-quenching. This research estimates the material characteristic after efficient and functional surface treatment using HPDL, which is more efficient than the existing CW Nd:YAG laser heat source.

A Study on the Diode Laser Surface Hardening Treatment of Cast Iron for Die Material(II) -Comparison of Hardening Characteristics by the Parts Applied Heat Treatment- (금형재료용 주철의 다이오드 레이저 표면경화처리에 관한 연구(II) - 표면경화의 적용 부위에 따른 열처리 특성의 차이 -)

  • Kim, Jong-Do;Song, Moo-Keun;Hwang, Hyun-Tae
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.8
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    • pp.1048-1054
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    • 2011
  • Laser surface hardening process is the method of hardening surface by inducing rapid self quenching of laser injected area through transfer of surface heat to inside after rapid heating of laser injected area only by high density energy heat source. This surface treatment method does not involve virtually any thermal deformation by heat treatment nor accompanies any other process after surface hardening treatment. In addition, allowing local machining, this method is a surface treatment method suitable for die with complicated shape. In this study, die material cast iron was surface-treated by using high power diode laser with beam profile suitable for heat treatment. Since the shapes of die differ by press die process, specimens were heat-treated separately on plane and corner depending on the applied parts. At this time, corner heat treatment was done with optic head inclined at $10^{\circ}$. As a result, corner heat treatment easily involves concentration of heat input due to limitation of heat transfer route by the shapes compared with plane part, so the treatment accomplished hardening at faster conveying speed than plane heat treatment.

Characteristics of $1.3\;{\mu}m$ InAs/GaAs Quantum Dot Laser Diode for High-Power Applications (고출력 응용을 위한 $1.3\;{\mu}m$ InAs/GaAs 양자점 레이저 다이오드의 특성 연구)

  • Kim, Kyoung-Chan;Yoo, Young-Chae;Lee, Jung-Il;Han, Il-Ki;Kim, Tae-Geun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.477-478
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    • 2006
  • Characteristics of InAs/GaAs quantum dot (QD) ridge laser diodes (LDs) are investigated for high-power $1.3\;{\mu}m$ applications. For QD ridge LDs with a $5-{\mu}m$-wide stripe and a 1-mm-long cavity, the emission wavelength of 1284.1 nm, the single-uncoated-facet CW output power as high as 90 mW, the external efficiency of 0.31 W/A and the threshold current density of $800\;mA/cm^2$ are obtained. The linewidth enhancement factor ($\alpha$-factor) is successfully measured to be between 0.4 and 0.6, which are about four times as small values with respect to conventional quantum well structure. It is possible that this result significantly reduce the filamentation of far-field profiles resulting in better beam quality for high power operation.

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Temperature Controlled Laser Hardening with High Power Diode Laser (고출력다이오드레이저를 이용한 금형의 레이저열처리 기술)

  • Hoffmann, Peter;Dierken, Roland;Endress, Thomas
    • Journal of the Korean Society for Heat Treatment
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    • v.20 no.4
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    • pp.203-208
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    • 2007
  • 고출력 다이오드레이저(High Power Diode Laser, HPDL)는 독일을 중심으로 한 유럽내의 여러 국가에서 적용분야를 점차 높여가고 있으며, 금속소재에 있어서의 높은 흡수율 및 발진장치의 높은 에너지 변환효율이 중요한 요인이라고 할 수 있다. 레이저소스로부터 출력되는 사각형 또는 라인형의 레이저-빔은 다이오드레이저를 이용한 금속의 열처리분야에 매우 적합하며, 이미 Body-in-White 차체(Car Body) 양산라인의 브레이징 공정에는 수 년 전부터 실제 적용되어왔다. 또한, 다양한 빔 형상, 균일한 에너지 밀도, 낮은 운전비용, 간단한 유지보수, 좁은 설치공간, 손쉽게 이동이 가능한 구조, 광케이블을 이용한 레이저-빔의 전송 등 여러 장점으로 인하여 보다 유연하고 효과적인 생산환경을 구축할 수 있다는 것 또한 다이오드레이저의 응용분야를 확대하는 요인이 되었다.