• 제목/요약/키워드: Ti:sapphire laser

검색결과 114건 처리시간 0.026초

Planar Type Flexible Piezoelectric Thin Film Energy Harvester Using Laser Lift-off

  • Noh, Myoung-Sub;Kang, Min-Gyu;Yoon, Seok Jin;Kang, Chong-Yun
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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    • pp.489.2-489.2
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    • 2014
  • The planar type flexible piezoelectric energy harvesters (PEH) based on PbZr0.52Ti0.48O3 (PZT) thin films on the flexible substrates are demonstrated to convert mechanical energy to electrical energy. The planar type energy harvesters have been realized, which have an electrode pair on the PZT thin films. The PZT thin films were deposited on double side polished sapphire substrates using conventional RF-magnetron sputtering. The PZT thin films on the sapphire substrates were transferred by PDMS stamp with laser lift-off (LLO) process. KrF excimer laser (wavelength: 248nm) were used for the LLO process. The PDMS stamp was attached to the top of the PZT thin films and the excimer laser induced onto back side of the sapphire substrate to detach the thin films. The detached thin films on the PDMS stamp transferred to adhesive layer coated on the flexible polyimide substrate. Structural properties of the PZT thin films were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). To measure piezoelectric power generation characteristics, Au/Cr inter digital electrode (IDE) was formed on the PZT thin films using the e-beam evaporation. The ferroelectric and piezoelectric properties were measured by a ferroelectric test system (Precision Premier-II) and piezoelectric force microscopy (PFM), respectively. The output signals of the flexible PEHs were evaluated by electrometer (6517A, Keithley). In the result, the transferred PZT thin films showed the ferroelectric and piezoelectric characteristics without electrical degradation and the fabricated flexible PEHs generated an AC-type output power electrical energy during periodically bending and releasing motion. We expect that the flexible PEHs based on laser transferred PZT thin film is able to be applied on self-powered electronic devices in wireless sensor networks technologies. Also, it has a lot of potential for high performance flexible piezoelectric energy harvester.

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Kerr 렌즈 모드록킹된 티타늄 사파이어 레이저에서 10fs 이하 펄스의 발생 (Generation of sub-10-fs Pulses from a kerr-Iens mode-locked Ri:sapphire Iaser)

  • 홍경한;차용호;강영일;남창희
    • 한국광학회지
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    • 제11권1호
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    • pp.43-46
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    • 2000
  • Kerr 렌즈 모드록킹된 티타늄 사파이어 레이저에서 상용화된 광학부품만을 이용하여 9 fs의 펄스를 생성하였다. 공진기 내부와 출령경을 지나면서 발생하는 군속도 분산을 각각 용융 프리즘 쌍을 이용하여 보상하였고, 넓은 스펙트럼을 얻기 위하여 광대역 거울을 사용하였다. 이전에 사용했던 광대역 거울과 반사율을 비교해 봄으로서 10fs 미만의 극초단 펄스를 생성하기 위해서는 180nm 이상의 넓은 반사대역을 갖는 거울을 선택하는 것이 필수적임을 확인하였다.

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근적외선 펨토초 레이저 및 이광자 바이오 영상 기술 (Near Infrared Femtosecond Laser and Its Two-photon Bio-imaging Technology)

  • 송동훈;서홍석;이상균;허철;박수준
    • 전자통신동향분석
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    • 제36권5호
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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.

광자 결정 광섬유에서 펌프광원의 파장과 입력파워에 따른 초 광대역 광원 발생의 특성 (Characterization of Supercontinuum Generation as a function of Pump Wavelength and Intensity in Photonic Crystal Fiber)

  • 김종두;이기주;전민용;안성준;최용규
    • 한국광학회지
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    • 제16권6호
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    • pp.490-493
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    • 2005
  • 본 논문은 광자 결정 광섬유에서 100 fs의 펄스 폭을 갖는 펌프 광원의 파장과 입력파워에 따른 초 광대역 광원 생성에 대해 실험적으로 연구하였다. 적절한 파라미터들을 조절함으로써 광 스펙트럼 진폭의 균일함이 10 dB 이내에서 약 750 nm의 스펙트럼 폭을 갖는 초 광대역 광원을 얻어냈다. 사용한 광자 결정 광섬유의 길이는 2 m였고, 펌프광원으로는 모드 록킹된 Ti:Sapphire laser를 사용하였다. 또한, 펌프 광원의 여러 가지 변수들을 바꿔줌으로써 초 광대역 광원의 다양한 스펙트럼 현상을 조절할 수 있었다.