• Title/Summary/Keyword: Laser module

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Application of femtosecond laser hole drilling with vibration for thin Invar alloy using fine metal mask in AMOLED manufacturing process (AMOLED 제조공정에 사용되는 Fine Metal Mask 용 얇은 Invar 합금의 진동자를 이용한 펨토초 레이저 응용 홀 드릴링)

  • Choi, Won-Suk;Kim, Hoon-Young;Shin, Young-Gwan;Choi, Jun-ha;Chang, Won-Seok;Kim, Jae-Gu;Cho, Sung-Hak;Choi, Doo-Sun
    • Design & Manufacturing
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    • v.14 no.3
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    • pp.44-49
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    • 2020
  • One of display trends today is development of high pixel density. To get high PPI, a small size of pixel must be developed. RGB pixel is arranged by evaporation process which determines pixel size. Normally, a fine metal mask (FMM; Invar alloy) has been used for evaporation process and it has advantages such as good strength, and low thermal expansion coefficient at low temperature. A FMM has been manufactured by chemical etching which has limitation to controlling the pattern shape and size. One of alternative method for patterning FMM is laser micromachining. Femtosecond laser is normally considered to improve those disadvantages for laser micromachining process due to such short pulse duration. In this paper, a femtosecond laser drilling for thickness of 16 ㎛ FMM is examined. Additionally, we introduce experimental results for controlling taper angle of hole by vibration module adapted in laser system. We used Ti:Sapphire based femtosecond laser with attenuating optics, co-axial illumination, vision system, 3-axis linear stage and vibration module. By controlling vibration amplitude, entrance and exit diameters are controllable. Using vibrating objective lens, we can control taper angle when femtosecond laser hole drilling by moving focusing point. The larger amplitude of vibration we control, the smaller taper angle will be carried out.

Simulation of ND Filter for Terrestrial Laser Scanner (3차원 레이저 스캐너용 ND 필터의 시뮬레이션)

  • Yang, Soo-Hyo;Oh, Dong-Geun;Jeong, Joong-Yeon
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2009.04a
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    • pp.65-73
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    • 2009
  • The terrestrial laser scanner measures the signal delay time of electronic circuit in EDM(Electronic Distance Measurement) Module for distance measurement. To measure signal delay time precisely, transmitting laser beam of terrestrial laser scanner is divided optically. Therefore, 10% of the laser beam power is entered into the electronic circuit and the others go out through lens. But, measure of delay time is severe in the laser scanner system that the laser beam power is changed dynamically by reflectance of a object, because characters like gain of electronic circuit involving APD(Avalanche Photo Diode) and so on are changed by incident laser beam. Therefore, we adapt ND(Neutral Density) filter that has grid pattern to the laser scanner system to keep constant the incident laser beam power. In this paper, we propose the simulation program for efficient design of ND filter pattern. Finally, to affirm simulation program, we conduct the experimental test of simulated ND filter that has linearly transmittance change, and we consider the experiment result.

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Optimization of a Passively Q-switched Yb:YAG Laser Ignitor Pumped by a Laser Diode with Low Power and Long Pulse Width

  • Kim, Jisoo;Moon, Soomin;Park, Youngin;Kim, Hyun Su
    • Current Optics and Photonics
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    • v.4 no.2
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    • pp.127-133
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    • 2020
  • We successfully constructed a passively Q-switched Yb:YAG laser ignitor pumped by a diode laser with low power and long pulse width. To the best of our knowledge, this is the first study to achieve a quasi-MW output power from an optimized Q-switch Yb:YAG laser ignitor by using a pumping diode laser module emitting at under a power of 23 W. The output pulse energy of our optimized laser is 0.98 mJ enclosed in a 1.06 ns pulse width, corresponding to a peak power of 0.92 MW.

The Characteristic of TEC Power Consumption of Laser Diode Module (레이저다이오드 모듈 냉각용 TEC 소비전력 특성)

  • Lee Jong Jin;Yu Chong Hee;Kang Hyun Seo;Koh Jai Sang
    • Journal of the Microelectronics and Packaging Society
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    • v.11 no.3 s.32
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    • pp.71-76
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    • 2004
  • The power consumption of TEC for Laser diode cooling was predicted by 3-D FEM simulation and verified by experiment. The operating conditions such as power consumption of Laser diode, set temperature, ambient temperature, resistance of thermal path was considered to estimate the TEC power consumption. Using 3-D FEM simulation, the relation between TEC configuration defined by the pellet dimension and the number and power consumption was investigated for low power consumption scheme. As a result, as the thermal resistance of the pellet increased, the power consumption decreased.

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A Study on Development of PC Based In-Line Inspection System with Structure Light Laser (구조화 레이저를 이용한 PC 기반 인-라인 검사 시스템 개발에 관한 연구)

  • Shin Chan-Bai;Kim Jin-Dae;Lim Hak-Kyu;Lee Jeh-Won
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.11 s.176
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    • pp.82-90
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    • 2005
  • Recently, the in-line vision inspection has become the subject of growing research area in the visual control systems and robotic intelligent fields that are required exact three-dimensional pose. The objective of this article is to study the pc based in line visual inspection with the hand-eye structure. This paper suggests three dimensional structured light measuring principle and design method of laser sensor header. The hand-eye laser sensor have been studied for a long time. However, it is very difficult to perform kinematical analysis between laser sensor and robot because the complicated mathematical process are needed for the real environments. In this problem, this paper will propose auto-calibration concept. The detail process of this methodology will be described. A new thinning algorithm and constrained hough transform method is also explained in this paper. Consequently, the developed in-line inspection module demonstrate the successful operation with hole, gap, width or V edge.

Beat Frequency Switchable Dual-mode External cavity laser (비트 주파수를 스위칭할 수 있는 듀얼 모드 외부 공진기 레이저)

  • Kim, Chul-Seop;Kim, Ryun-Kyung;Lee, Kyung-Shik;Song, Jeong-Hwan;Oh, Yun-Kyung
    • Korean Journal of Optics and Photonics
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    • v.17 no.6
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    • pp.489-492
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    • 2006
  • We demonstrate a beat frequency-Switchable dual-mode external cavity laser hybrid integrated on planar lightwave circuit with an FP-LD and a sampled grating as external reflector. The dual-mode external avity laser was able to switch its beat frequency from 132GHz to 406GHz by changing LD current from 50mA to 55mA.

A Study on the Development of the Rotary and Linear Laser Modules (회전식 및 직선식 레이저 모듈 개발에 관한 연구)

  • Sim, Min-Seop;Hwang, Seong-Ju;Kim, Dong-Hyeon;Lee, Choon-Man
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.2
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    • pp.119-123
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    • 2014
  • Recently, laser processing technologies have been developed in many different industrial fields. The laser processing technologies are widely being applied such as laser assisted machining, cladding, heat treatment and coating. In the laser modules of the laser assisted machining system, laser lens is very important for accuracy and productivity of product. As the laser beam size, shape and focusing distance change, heat input energy of preheating point can be changed, the laser module of the laser assisted machining system should be equipped with various lenses differing beam size, beam shape and focusing distance. In this study, the rotary and linear laser modules are suggested. The finite element analysis is carried out to certify the static and dynamic stabilities of the developed laser modules. Finally, the rotary and linear laser modules have been fabricated successfully using the analysis results.

Development of Highly Accurate Inspection System for Cylindrical Aluminum Casts with Microscopic Defects

  • Shinji, Ohyama;Hong, Keum-Shik
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.35.3-35
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    • 2001
  • Developed is an optical auto-inspection system to detect some microscopic defects on the Inside surface of the hydraulic automobile brakes at the production line. A small cylindrical detection module with a solid laser source at its center has two rings of optical fibers to separately collect light reflected and scattered from the defects on the surface. The cylindrical brake part rotates with respect to the detection module that will move parallel to the rotational axis of the cylinder. Thus, the optical module can scan the whole inside surface area. The automatic detection of the defects is to compare the intensity distributions ...

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Special quality research by pulse transformer stabilization by high tension output module of medical ultra series laser II (산부인과용 $CO_2$ 연속형 레이저의 고압출력 모듈에 따른 펄스트랜스 안정화 특성연구(II))

  • Kim, Whi-Young
    • Journal of the Korea Computer Industry Society
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    • v.8 no.1
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    • pp.49-56
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    • 2007
  • Various kind of laser had been used on addition to endoscope for obstetrics and gynecology, gas laser such as CO2 laser had been used mainly much in laparoscope surgical operation mainly Thermal effect of beam displays other result different component parts of cellular tissue and different close of a marketplace of laser beam and priority solidification of temperature increase consists in cellular tissue, and cutting or carbonization process happens and evaporation by breakdown of cellular tissue happens more than $300^{\circ}$. <중략> Ostabilization of pulse transformer by high tension output module of CO2analog laser for obstetrics and gynecology that accomplish marks of honor kind switching and accuracy is required, and stabilize with laser output applying Turn-off in existent hard switching forward converter, on city happened switching damage, damage increase of output diode station recovery special quality, parasitism shock, design and result that manufacture, brought result that improve than existing product. Will be bought to get into superior result if supplement as systematic late.

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