• Title/Summary/Keyword: 주파수 안정화 레이저

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Frequency Stabilization of He-Ne laser using One Chip Micro-Processor (1칩 마이크로 프로세서를 이용한 He-Ne 레이저의 주파수 안정화)

  • 최현승;엄태봉;이선규
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.102-105
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    • 2000
  • A simple digital control system has been developed for the frequency stabilization of an internal mirror He-Ne laser. The system is based on one chip microprocessor with embedded Basic interpreter. To stabilize the laser output frequency, the signal such as power difference or beat frequency between two modes is supplied and processed by a microprocessor, and control signal is fed to the heating coil would round the laser tube for adjusting the spacing of the laser cavity mirror. Newly developed frequency stabilization system is totally digitized. The system and the frequency stability performance are briefly described.

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Frequency Stabilization of Femtosecond Lasers for Dimensional Metrology (거리 및 형상 측정을 위한 펨토초 레이저의 주파수 안정화)

  • Kim Young-Jin;Jin Jong-Han;Kim Seung-Woo
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.188-191
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    • 2005
  • A common feature in various methods of optical interferometry for absolute distance measurements is the use of multiple monochromatic light components either in sequence or in parallel at the same time. Two or multiple wavelength synthesis has been studied though its performance is vulnerable to the frequency instability of the light source. Recently continuous frequency modulation is considered a promising method with availability of wide band tunable diode lasers, which also have frequency instability errors. We can lock frequencies of these third-party light sources to the modes of the femtosecond laser which is stabilized to the precision of the standard radio frequency. To this end, we have stabilized all the modes of the femtosecond laser to the atomic frequency standard by using powerful tools of frequency-domain laser stabilization.

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Laser cooling and temperature measurement of cesium atoms (세슘 원자에 대한 레이저 냉각 및 온도 측정)

  • 권택용;이호성;양성훈
    • Korean Journal of Optics and Photonics
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    • v.11 no.6
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    • pp.379-384
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    • 2000
  • We cooled cesium atoms below the Doppler cooling limit by laser cooling. For this deep cooling of atoms, the laser frequency was shifted by using the Zeeman shift of an absorption line of cesium. The stabilization of the laser frequency was maintained while the laser frequency was shifted by 40 MHz within 2 ms. The lowest temperature of the laser-cooled cesium atoms was $2.2\muK$\pm$0.5$\muK$in this experiment. We measured the temperature of the laser-cooled cesium atoms as a function of the frequency detuuing and the intensity of the cooling laser. The results agreed well with the ones calculated by two-photon laser cooling theory.theory.

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I2-Saturated Absorption Spectroscopy for Frequency-Stabilization of He-Ne Laser at 543 nm (543 nm 헬륨네온 레이저의 주파수 안정화를 위한 I2 포화흡수분광)

  • Kim, Kyung-Chan;Eum, Nyeon-Sik;Hong, Joo-Hyun;Seo, Ho-Sung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.3
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    • pp.859-865
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    • 2010
  • We have designed and assembled a saturated absorption-spectroscopy system of $^{127}I_2$ for the frequency stabilization of the 543 nm He-Ne laser. The frequency of a internal-mirror 543 nm He-Ne laser was swept by utilizing the temperature and PZT change of the laser cavity length. Frequency modulation was applied to the output laser mirror with a PZT modulator for the third harmonic signal. A portion of the hyperfine spectrum originated from the R(12)26-0 and R(106)28-0 transitions of the B-X system of $^{127}I_2$ was observed as the third-derivative signal using a saturated absorption spectroscopy. The signal-to-noise ratio of a typical hyperfine spectrum signal was estimated to be 30:1.

Development of Wideband Frequency Modulated Laser for High Resolution FMCW LiDAR Sensor (고분해능 FMCW LiDAR 센서 구성을 위한 광대역 주파수변조 레이저 개발)

  • Jong-Pil La;Ji-Eun Choi
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.6
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    • pp.1023-1030
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    • 2023
  • FMCW LiDAR system with robust target detection capabilities even under adverse operating conditions such as snow, rain, and fog is addressed in this paper. Our focus is primarily on enhancing the performance of FMCW LiDAR by improving the characteristics of the frequency-modulated laser, which directly influence range resolution, coherence length, and maximum measurement range etc. of LiDAR. We describe the utilization of an unbalanced Mach-Zehnder laser interferometer to measure real-time changes of the lasing frequency and to correct frequency modulation errors through an optical phase-locked loop technique. To extend the coherence length of laser, we employ an extended-cavity laser diode as the laser source and implement a laser interferometer with an photonic integrated circuit for miniaturization of optical system. The developed FMCW LiDAR system exhibits a bandwidth of 10.045GHz and a remarkable distance resolution of 0.84mm.

Study on the characteristics of an ultrahigh-Q microsphere laser (초고품위 마이크로스피어 레이저의 발진 특성 연구)

  • 최용석;문희종;안경원
    • Proceedings of the Optical Society of Korea Conference
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    • 2001.02a
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    • pp.44-45
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    • 2001
  • 실리카 마이크로 스피어는 손실이 대단히 적은 초고품위 공진기로 알려져 있다. 최근의 실험들에 의하면 실리카 마이크로 스피어는 공진기 Q 값이 $10^{9-10}$ 정도인데, 이는 현재까지 만들어진 마이크로 공진기들 중에서 가장 높은 값이다. 최근 마이크로 스피어는 저손실의 공진기로서 문턱조건이 없는 레이저 연구에 활용되고 있으며, 레이저와 좁은 공명 모드 선폭을 이용하여 레이저 주파수 안정화 및 광섬유 결합기 등에 활용되고 있다. 또한 Cavity-QED 연구와 Cavity-QED 효과를 이용한 소수의 양자점 레어저 연구에도 활용도고 있다. (중략)략)

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Frequency stabilization of HeNe laser for interferometry (간섭계용 헬륨-네온 레이저의 주파수 안정화)

  • 주기남;김승우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.260-263
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    • 2003
  • Lasers are used as the source of the interferometers in the industrial field. These lasers need 2 requirements. The first is the narrow linewidth of laser for the long coherence length. The second is the stabilized frequency of laser for the precision measurement. Now HeNe lasers are mostly used and the frequency stability is about 10$^{-9}$ . In this paper, we construct the HeNe laser systems of frequency stabilization using typical 2 method, the beat frequency stabilization method and the intensity difference method. So, we get the frequency stabilities of 2.01$\times$10$^{-9}$ (0.1s), 3.4$\times$10$^{-9}$ (0.1s).

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