• 제목/요약/키워드: frequency-stabilized laser

검색결과 42건 처리시간 0.03초

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

  • 김영진;진종한;김승우
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 추계학술대회 논문집
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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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광음향효과에 의한 $CO_2$ 레이저 주파수 및 출력 안정화 방법 (Frequency and Power Stabilization of $CO_2$ Laser Using a Photoacoustic Effect)

  • 최종운;유문종;최성웅;서호성
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제53권11호
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    • pp.583-588
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    • 2004
  • We stabilized the frequency and power of a high voltage excited CW CO2 laser on the peak of the Doppler broadened gain curve using the photoacoustic effect generated from the laser itself. The photoacoustic signal is directly coupled from an radio frequency discharge chamber via a capacitor microphone into a detector and a lock-in stabilizer. The frequency stability is estimated to be better then 1.2×10/sup -7/ at the transition P(20) line. The stabilized output power variation was reduced to from 77 % to 3.3 %.

Second Harmonic Generation and Frequency Stabilization of a Diode Laser Using an External Ring Resonator

  • Kwon, Taeg-Yong;Yang, Sung-Hoon;Lee, Ho-Seong
    • Journal of the Optical Society of Korea
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    • 제2권1호
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    • pp.1-4
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    • 1998
  • The second harmonic light of an 842 nm diode laser was generated from a KNbO3 crystal in an external ring resonator. The power of the second harmonic light was about 0.8 mV at an input fundamental power of 87 mW. The laser frequency was stabilized to the resonance frequency of the ring resonator, and the frequency fluctuation was measured as about 3 MHz.

Characterization of carrier-envelope-offset frequency of a femtosecond laser stabilized by the direct CEP locking method

  • Luu, Tran Trung;Lee, Jae-Hwan;Kim, Eok-Bong;Park, Chang--Yong;Yu, Tae-Jun;Nam, Chang-Hee
    • 한국광학회:학술대회논문집
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    • 한국광학회 2009년도 창립 20주년기념 특별학술발표회
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    • pp.241-242
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    • 2009
  • Characterics of carrier-envelope-offset frequency ($f_{ceo}$) of a femtosecond laser stabilized by the direct locking method were investigated using two f-to-2f interferometers. The stability of $f_{ceo}$ was comaparable to that achieved with a conventional PLL method.

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헤테로다인 레이저 간섭계에서 고속 측정을 위한 주파수 변조 알고리즘 (AFM modulation algorithm for the high speed measurement using a heterodyne laser interferometer)

  • 최현승;윤희선;박기환
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 추계학술대회 논문집
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    • pp.922-925
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    • 2005
  • This article describes a FM modulation algorithm to increase the measurement speed by increasing the beat frequency of the laser without acousto-optic modulator(AOM) in the heterodyne laser interferometer. The proposed algorithm can increase the beat frequency of the heterodyne laser which limit the measurement speed by adjusting a carrier frequency through electronic circuit, while AOM is used to shift the frequency of the heterodyne laser in conventional method. Electronic circuit is constructed to modulate the signals from a laser interferometer and a waveform generator. The brier analysis, the measurement scheme of the system, and the experimental results using a Zeeman-stabilized He-Ne laser are presented. They demonstrate that the proposed algorithm is proven to enhance the measurement speed limit by increasing the beat frequency of the heterodyne laser.

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PLL을 이용한 헬륨-네온 레이저의 옵셋 주파수 안정화 (Offset Frequency Stabilization of He-Ne Lasers Using Phase Locked Loop)

  • 윤동현;서호성;유준
    • 제어로봇시스템학회논문지
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    • 제11권6호
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    • pp.496-501
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    • 2005
  • This paper presents experimental results of the frequency offset locking of He-Ne lasers and the stability analysis. The master laser is free running, and the slave laser is a single-mode operating laser. The frequency difference of two lasers is stabilized to 200 MHz which can be synchronized using PLL servo. The measured beat frequency between two lasers was 200.004 MHz ${\pm}$ 0.15 MHz. The square root of Allan variance as a measure of stability in time domain is also measured. The long-term stability of the beat was worse than sort-term stability. With a gate time $\tau=1000\;s$, the square root of Allan variance was about 1 GHz. The results of the square root of Allan variance of the stabilized beat signal was a gate time of $\tau=1000\;s$, the square root of Allan variance was about 1.5 kHz. The long-term stability was improved by more than several hundred times compared with that without the stabilization.

2-종 모드 레이저를 이용한 고분해능 헤터로다인 간섭계 (A High-Resolution Heterodyne Interferometer using Beat Frequency between Two-Axial Modes of a HeNe Laser)

  • 김민석;김승우
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 추계학술대회 논문집
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    • pp.214-219
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    • 1997
  • We propose a new scheme of high-resolution heterodyne interferometer that employs the two-axial mode He-Ne laser with an inter-mode beat frequency of 600-1000 MHz. An electronic RF-heterodyne circuit lowers the beat frequency down to 5 MHz, so that the phase change of the interferometer output is precisely measured with a displacement resolution of 0.1 nanometer without significant loss of dynamic bandwidth. A thermal control scheme is adopted to stabilize the cavity length with aims to suppress frequency drifts caused by the phenomena of frequency pulling and polarization anisotropy of the two-axial mode laser to a stability level of 2 parts in $10^9$. The two-axial mode HeNe laser yields a high output power of 2.0 mW, whlch allows us to perform multiple measurements of up to 10 machine axes simultaneously.

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

  • 주기남;김승우
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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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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광음향 효과에 의한 고주파 여기식 CO2 레이저의 주파수 및 출력 안정화 (Frequency and power stabilization of radio frequency excited CO2 laser using photoacoustic effect)

  • 최종운;유문종;우삼용;서호성
    • 한국광학회지
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    • 제15권6호
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    • pp.569-574
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    • 2004
  • 고주파 여기식 $CO_2$ 레이저의 주파수와 출력을 레이저 공진기 자체에서 발생하는 광음향효과를 이용하여 안정화하였다. 레이저 공진기 속의 복사선 세기를 임의로 변화시킬 때 광음향효과에 의해서 레이저 매질가스의 압력이 변화하였다. 공진기 속에 설치한 컨덴서마이크를 사용하여 미세한 압력변화를 전압신호로 변환시켜 록인안정기의 입력신호로 사용하였다. P(20)선에서 발진하는 레이저를 이득곡선의 꼭지점에 레이저의 주파수와 출력을 안정화 시켰을 때, 광주파수 상대 안정도는 5.4${\times}$$10^{-8}$ 이었고, 레이저 출력 변화율은 9.3%로 안정화되었다.