• Title/Summary/Keyword: Ti : Sapphire

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Characteristics of four-pass Ti:sapphire laser amplifier and amplified spontaneous emission (사중경로 Ti:sapphire 레이저 증폭기의 증폭 특성과 자발방출에 의한 증폭)

  • 김규옥
    • Korean Journal of Optics and Photonics
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    • v.11 no.5
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    • pp.365-370
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    • 2000
  • We have constructed a collinear four pass Ti.sapphire laser amplifier by usmg polmization effect When we pumped the mnplifier with 188 mJ second harmonics of Q-switched Nd:YAG laser, we observed that a 450 mW 1l1cident cw Ti:sapphire laser beam is amphfled to pulse with energy of 34 mJ and pulse width (FWffM) of 25 os. We could mmllmze the a.mplified spontaneous emission by simple method of rotating the Tbapphire amplifier rod er rod

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Spectrum Narrowing Characteristics of a Tunable Ti:sapphire Laser (파장가변 Ti:sapphire 레이저의 협대역 특성)

  • 이용우;이주희
    • Korean Journal of Optics and Photonics
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    • v.6 no.1
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    • pp.16-20
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    • 1995
  • We have studied the spectral narrowing characteristics of the tunable Ti:sapphire laser pumped by the second harmonic generation of Nd:YAG laser. Ti:sapphire laser has uniform excitation distribution by both-side end pumping. We have controlled the angle of grating linearly and achieved the continuous selection of wavelength in the broad range from 705 to 835 nm. The output energy of $380{\mu}J$ at 790 nm. the spectral linewidth of $0.13cm_{-1}$ and the beam divergence of 1.2 mrad have been obtained. The wavelength range with power more than 50% of maximum output was 730-825 nm.825 nm.

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Characteristics of Nd:YAG Laser Pumped by cw Ti:sapphire Laser and Its Passive Q-switching with Cr4+:YAG as Saturable Absorber (Cr4+:YAG 포화 흡수체를 이용한 Ti:sapphire 레이저 여기 Nd:YAG 레이저의 수동형 Q-switching 특성)

  • 안범수;추한태;김규욱
    • Korean Journal of Optics and Photonics
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    • v.15 no.3
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    • pp.263-267
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    • 2004
  • We have investigated the characteristics of a Nd:YAG laser pumped by a cw Ti:sapphire laser. When the pumping power of the Ti:sapphire laser was 850 ㎽, the maximum output power of the Nd:YAG laser was 450 ㎽. As a result, the slope efficiency for the output power of the Nd:YAG laser was measured to be 56%. We have also investigated the characteristics of a passively Q-switched Nd:YAG laser by using a Cr$^{4+}$:YAG as saturable absorber with initial transmission of 90%. The maximum average output power of 200 ㎽ was obtained with repetition rate of 23.8 KHz and pulse width of 17.0 ns.

The Output Characteristics of Flashlamp Pumped Ti:sapphire Laser Enhanced by Energy Transfer Dye (에너지 전환 방식에 의한 섬광관 펌핑 Ti$^{3+}$ : Sapphire 레이저의 발진특성)

  • 김희경
    • Korean Journal of Optics and Photonics
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    • v.4 no.4
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    • pp.442-446
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    • 1993
  • A flashlamp pumped Ti: sapphire laser was designed and fabricated in the laboratory. In order to find out the optimum pumping condition, three kinds of discharge circuits of which the pulse width are 10${\mu}s$, 45${\mu}s$, 65${\mu}s$ were designed. The fluorescent energy converter LD-490 of which the fluorescence spectra is coincident to the absorption band of Ti: sapphire was used to improve the laser efficiency. The laser output characteristics for three different concentrations of LD-490 and for three different pumping pulse widths were measured. As a result, the shorter the flashlamp pulse width, the higher the overall efficiency was achieved. When pumping light pulsewidth was 10${\mu}s$, the best efficiency was obtained at the concentration 1.0${\times}10^{-3}$mol/l of LD-490 dye. At lower concentrations the efficiencies were decreased.

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Characteristics of a CW Ti:sapphire Laser in a Folded Geometry (접힌 공진기 형태의 연속 발진 티타늄 사파이어 레이저의 발진 특성)

  • 강영일;차용호;남창희
    • Korean Journal of Optics and Photonics
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    • v.6 no.4
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    • pp.282-287
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    • 1995
  • We have studied the characteristics of a cw Ti:sapphire laser pumped by an Ar-ion laser. Ti:sapphire is one of the most attractive materials for the generation of ultra-short pulses because of its very broad gain bandwidth. We used a 4.1 mm thick, 0.15 wt. % $Ti^{3+}$ -doped, Brewster-angled Ti:sapphire crystal and made a folded cavity to create a strong focusing mode. The folding angle of the cavity was adjusted to $15.4^{\circ}$ to compensate for the astigmatism from the Brewster-angled Ti:sapphire crystal. 5 WAr-ion laser was used as a pumping source. We observed that the Ti:sapphire cw output power was sensitively changed with respect to the condition of the folded cavity. The threshold pumping power was 2 Wand the slope efficiency was 16% when an output coupler of 10% transmission was used. The maximum output power was more than 450 mW at 5 W pumping. mping.

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Operational Characteristics of a Single Longitudinal Mode (단일 종모드 Ti:Sapphire 링 레이저 제작과 동작특성)

  • 김용평;조재홍;윤태현
    • Proceedings of the Optical Society of Korea Conference
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    • 1991.07a
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    • pp.71-75
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    • 1991
  • Ti-Sapphire 레이저는 광대역 특성 때문에 최근 색소레이저의 대체 레이저로써 활발히 연구되고 있다. 본연구에서는 고분해 분광학의 광원으로 이용하기 위해 설계 제작한 단일 종모드로 동작하는 Ti:Sapphire 레이저의 특성에 대해 논한다.

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Output Characteristics of a Pulsed Ti:sapphire Laser Oscillator Pumped Longitudinally by Second Harmonic Wave of Nd:YAG Laser and a Ti:sapphire Laser Amplifier Operated along the Single Path of the Oscillator Beam (Nd:YAG 레이저의 제 2조화파로 종여기하는 펄스형 Ti:sapphire 레이저 발진기와 이를 이용한 단일경로 형태의 Ti:sapphire 증폭기의 출력특성)

  • Kim, Kyung-Nam;Jo, Jae-Heung;Lim, Gwon;Cha, Byung-Heon
    • Korean Journal of Optics and Photonics
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    • v.18 no.1
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    • pp.66-73
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    • 2007
  • The various output characteristics of a pulsed Ti:sapphire laser oscillator with a plane-parallel resonator, pumped longitudinally by the second harmonic wave of a Nd:YAG laser, and the output of a Ti:sapphire laser amplifier operated along the single path of the oscillator beam were investigated and analyzed. In the case of the oscillator, we measured the spectrum, the pulse buildup time, the temporal duration time of the pulse, and the output energy according to the variation of the pumping energy, resonator length, and the reflectance of the output coupler. And, in the case of the amplifier, we investigated and analyzed the output energy of the amplifier as a function of the time difference between the two pump beams of the oscillator and the amplifier, the pumping energy of the oscillator, and the pumping energy of the amplifier When pump energies of both the oscillator and the amplifier were 18 mJ/pulse, we could find that the output energy of the amplifier increased linearly and gradually up to the time difference of 35 ns. Finally, we determined that the slope efficiencies of the oscillator and the amplifier were 23.5 % and 11.6 %, respectively.