• Title/Summary/Keyword: 이터븀

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Construction of Two-Photon Microscope by using Mode-Locked $Yb^{3+}$ doped Fiber Laser (모드잠김 이터븀 광섬유 레이저를 이용한 이광자 현미경 구현)

  • Kim, Dong-Uk;Song, Ho-Seong;Song, U-Seop;Kim, Deok-Yeong
    • Proceedings of the Optical Society of Korea Conference
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    • 2009.10a
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    • pp.235-236
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    • 2009
  • 파장이 길고 에너지가 낮은 근적외선 영역 광자 두 개를 동시에 여기했다가 형광으로 방출하는 비선형 현상을 이용한 이광자 현미경은 살아있는 세포를 넘어 생체조직 깊은 곳에서 일어나는 생물학적 변화 관찰 및 3차원 이미지 해석이 가능한 매우 효과적인 장비이다. 그러나 상용화된 이광자 현미경은 매우 고가이고 응용의 다양성을 위한 구조적 변형이 매우 힘들다. 본 논문에서는 모드잠김 이터븀 광섬유 레이저를 이용하여 비용 효율이 높고 다루기 쉬운 이광자 현미경을 구현 하고자 한다.

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A Simple Yb-Doped Mode-Locked Fiber Oscillator under Normal Dispersion as a Seed Laser (Seed 레이저용 정상분산 영역에서 발진하는 간단한 구조의 이터븀 기반 모드 잠금 광섬유 레이저)

  • Kim, Byeong Kwon;Joo, Ki-Nam
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.9
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    • pp.805-811
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    • 2014
  • In this investigation, we constructed and demonstrated a simple Yb-doped fiber laser, of which longitudinal modes are mode-locked without any additional devices to compensate the dispersion caused by optical components. Non-linear polarization rotation (NPR) was adopted for the mode-locking mechanism and a polarization controller (PC) was used for a kind of spectral filters to restrict the bandwidth for mode-locking. As the result, the laser was successfully operated as mode-locked with the repetition rate of 42.2 MHz and the spectrum was broadened up to approximately 16 nm at 1033 nm center wavelength when the laser was mode-locked. In this paper, the operation of the developed Yb-doped mode-locked laser is explained with the concept of Lyot filter realized by a PC, which enables mode-locking under normal dispersion. In the industrial applications, this laser can be used as a seed laser of the high power lasers for optical manufacturing.

Design of a Single Pulse Laser Range Finder with Er:Yb:glass Microchip Lasers (어븀:이터븀:유리 마이크로칩 레이저를 이용한 단펄스 거리측정기 설계)

  • Koh, Hae Seog;Lee, Chang Jae;Park, Choong Bum;Jeon, Hyoung Ha;Ahn, Pil Dong;Park, Do Hyun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.3
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    • pp.295-305
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    • 2018
  • We present a passively Q-switched monolithic Er:Yb:glass microchip laser developed in our lab. The microchip laser can produce pulses at 1535 nm of the 'eye-safe' wavelengths with the pulse energy of 50 uJ and the pulse width of 4-6 ns. Using the laser we also designed and developed a pulsed Er:Yb:glass microchip laser rangefinder. Expressions for background and signal power, noise, and signal-to-noise ratio are reviewed. A computer simulation was used to optimize laser power, receiver aperture, and preamplifier bandwidth for the efficient system design of the laser rangefinder. Experimental results are presented to compare with the theory.

Polarization-maintained Single-mode 400-W Yb-doped Fiber Laser with 2.5-GHz Linewidth from a 3-stage MOPA System (3단 MOPA 시스템에서 2.5 GHz 선폭을 가지는 편광유지 단일모드 400 W 이터븀 첨가 광섬유 레이저 연구)

  • Park, Young Ho;Youn, Young Seok;Jung, Min Wan;Jun, Changsu;Yu, Bong-Ahn;Shin, Woojin
    • Korean Journal of Optics and Photonics
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    • v.29 no.4
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    • pp.159-165
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    • 2018
  • In this paper, we report on the high power amplification of a narrow-linewidth Yb-doped polarization-maintained (PM) fiber laser in a 3-stage, all-fiber master oscillator power amplifier (MOPA) system. The linearly polarized single-mode output power was 400 W with an 85% slope efficiency, with a linewidth of 2.5 GHz (full width at half maximum). Furthermore, mitigation of mode instability (MI) has been demonstrated by tightly coiling the gain fiber to a diameter of 11 cm. In addition, methods for higher power scaling are discussed.