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1.
Frequency stabilization of a 1319-nm Nd:YAG laser by saturation spectroscopy of molecular iodine 总被引:1,自引:0,他引:1
Hyperfine transitions of molecular iodine were observed by use of the frequency-doubled output of a 1319-nm Nd:YAG laser with saturation spectroscopy. The laser frequency was stabilized to the observed hyperfine transition and reached a stability of 6 x 10(-12) for a 1.5-s averaging time, improving toward the 1 x 10(-12) level after 100 s. The iodine-stabilized 1319-nm Nd:YAG laser is an excellent candidate for an optical frequency standard for telecommunication applications. 相似文献
2.
K. Matsubara U. Tanaka H. Imajo K. Hayasaka R. Ohmukai M. Watanabe S. Urabe 《Applied physics. B, Lasers and optics》1998,67(1):1-4
3 and β-BaB2O4 crystals. The power of the generated 214.5-nm light amounts to more than 100 μW. This light source will be used for laser
cooling of Cd+ ions.
Received: 4 August 1997/Revised version: 28 October 1997 相似文献
3.
Frequency stabilization of a 399-nm laser by modulation transfer spectroscopy in an ytterbium hollow cathode lamp 下载免费PDF全文
The modulation transfer spectroscopy in an ytterbium hollow cathode lamp at 399 nm is measured. The error signal for frequency locking is optimized by measuring the dependences of its slope, linewidth and magnitude on various parameters. Under the optimum condition, the laser frequency at 399 nm can be stabilized. The long-term stability of laser frequency is measured by monitoring the fluorescence signal of the ytterbium atomic beam induced by the locked laser. The laser frequency is shown to be tightly locked, and the stabilized laser is successfully applied to the cooling of ytterbium atoms. 相似文献
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1.9-W flash-lamp-pumped solid-state 266-nm ultraviolet laser 总被引:1,自引:0,他引:1
Deep ultraviolet lasers have various applications in industries and scientific researches. For 266-nm ultra- violet (UV) laser generation, the good beam quality of 1064-nm laser and the elimination of gray-tracking effect of KTP crystal are two key factors. Using a dynamically stable resonator design, 1064-nm laser with an average power of 52 W is realized with repetition rate of 16 kHz. The measured M^2 factor characterizing the beam quality is 1.5. By the elimination of gray-tracking effect of KTP crystal, an 18-W green laser is realized with the M2 factor of 1.6. Using a BBO crystal for the fourth harmonic generation, a 1.9-W 266-nm UV laser is achieved. 相似文献
6.
The master laser of an injection-seeded laser for Doppler wind lidar is frequency stabilized to a FabryPerot (FP) cavity using Pound-Drever-Hall technique. The FP cavity is specially designed to gain high temperature stability with Zerodur cavity and spacer. A computer based controller is used to sample and process the error signal. After the master laser is locked, the relative frequency drift is±25 kHz in 1 s,and ±55 kHz in 1 h, which can satisfy the need of Doppler wind lidar. 相似文献
7.
An optimized dual fiber Bragg grating (FBG) is proposed for 980-nm semiconductor lasers without thermoelectric coolers to restrict temperature-induced wavelength shift.The mathematical model of the temperature-induced wavelength shift of the laser with the dual FBG is built using the external cavity feedback rate equations.The external cavity parameters are optimized for achieving the stability mode-locking laser output.The spectral characteristics of the dual FBG stabilized laser are measured to range from 0 to 70 °C.The side mode suppression ratio (SMSR) is more than 45 dB,while the full-width at half-maximum (FWHM) is less than 1 nm.The peak wavelength shift is less than 0.1 nm.The dual FBG wavelength shift proportional coefficient is between 0.1086 and 0.4342. 相似文献
8.
The cavity length of an internal-mirror HeNe laser was controlled using a thin film heater coated on the tube. The response speed was about ten times higher than that of the usual tube wound with a ribbon heater. The high response speed brought two merits in frequency stabilization of the laser; one was improvement of stability in the short time region and the other was the realization of a thermal modulation method, by which the cavity was stabilized at Lamb's dip. 相似文献
9.
A single-frequency passively Q-switched laser was constructed,in which a co-doped crystal served as an active element,a mode selector,and a passive Q-switch simultaneously.In order to obtain the frequency instability of 10-6,a stable single-frequency operation was presented and its characteristics were deter mined.The experimental results showed that the stable single frequency could be maintained for half an hour and the linewidth was approximately 530 MHz at a pump power of 13 W. 相似文献
10.
The Lamb dip of CO rovibrational transition is detected by a room temperature extracavity RF optogalvanic cell and employed
to stabilize the frequency of a CO laser. The S/N ratio of optogalvanic signal is about 2000
at optical power < 1 W. The relative depth of Lamb dip is 2.3%. The S/N ratios of first and third harmonic demodulated saturation
signals are about 40
and 10
, respectively. The CO laser is stabilized using the first harmonic demodulated signal, and the frequency stability is better
than 300 kHz.
Concurrently, the influences of operational parameters, which include the coil current, partial pressures of gas mixture,
are investigated. A simple model for the influence of coil current is presented, and further improvements are addressed as
well. 相似文献
11.
Reproducible fluorescence spectra of individual 2- to 5-microm -diameter biological aerosol particles excited with a single shot from a Q -switched laser (266 or 351 nm) have been obtained with highly improved signal-to-noise ratios. Critical to the advance are crossed diode-laser trigger beams, which precisely define the sample volume, and a reflecting objective, which minimizes chromatic aberration and has a large N.A. for collecting fluorescence. Several allergens (red oak, meadow oat pollen, paper mulberry pollen, and puffball spores) have different fluorescence spectra. Bacillus subtilis fluorescence spectrum deteriorates at high 266-nm incident intensity. Dry riboflavin particles illuminated with a 351-nm light exhibit a new 420-nm fluorescence peak that grows nonlinearly with laser pulse energy. 相似文献
12.
M. Yu. Tretyakov A. P. Shkaev A. M. Kiselev S. B. Bodrov A. V. Andrianov D. S. Makarov 《JETP Letters》2010,91(5):222-225
The frequency of a primary subterahertz oscillator has been phase locked with the use of the equidistant components of a broad
spectrum produced by a femtosecond laser. The optical-to-terahertz down-conversion of the laser pulse train and its mixing
with subterahertz radiation has been performed at a Schottky diode. This work provides the opportunity of creating a principally
new generation of frequency synthesizers with the desired power and phase noise a few orders of magnitude lower than that
of their traditional analogues. 相似文献
13.
J. Zheng X. F. Wang W. Y. He Y. Y. Bu X. H. Yan 《Applied physics. B, Lasers and optics》2014,115(4):443-449
The multi-photon ultraviolet upconversion emission properties and synergistic effect are investigated in BaSr2Y6O12:Er3+ phosphor. The deep-ultraviolet emissions centered at 274, 297 and 324-nm are observed under the 1,540-nm excitation, which results from a seven-, six- and six-photon upconversion process, respectively. A synergistic effect is found, which shows that the red emission intensity under 351- and 1,540-nm dual excitation is 4.7 % time stronger than the sum of red emission intensities under the 351 and 1,540-nm single excitation. This phenomenon is attributed to the 4I13/2 and 4I11/2 levels of Er3+ from non-radiative transition process under the 351-nm excitation are excited again to 4F9/2 level by absorbing 1,540-nm photon in the 351- and 1,540-nm dual-excitation process. 相似文献
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Yun Long Zhuanxian Xiong Xi Zhang Mengjiao Zhang Baolong Lv Lingxiang He 《中国光学快报(英文版)》2014,12(2):21401-37
The laser cooling of ytterbium(Yb) atoms needs a 399-nm laser which operates on the strong1S0-1P1 transition and can be locked at the desired frequencies for different Yb isotopes.We demonstrate a frequency locking method using the fluorescence spectrum of an Yb atomic beam as a frequency reference.For unresolved fluorescence peaks,we make the spectrum of the even isotopes vanish by using the strong angular-dependence of the fluorescence radiations;the remained closely-spaced peaks are thus clearly resolved and able to serve as accurate frequency references.A computer-controlled servo system is used to lock the laser frequency to a single fluorescence peak of interest,and a frequency stability of 304 kHz is achieved.This frequency-locked laser enables us to realize stable blue magneto-optic-traps(MOT) for all abundant Yb isotopes. 相似文献
17.
Experiments on developing a frequency-stabilized 555.8-nm laser are presented. The 555.8-nm laser' is obtained by frequency doubling of a l lll.6-mn diode laser through single-passing a periodically poled lithium niobate (PPLN) waveguide. Tile 555.8-nm laser is then locked to a stable high-finesse Fabry Perot (FP) cavity by tile Pound Drever--Hall (PDH) technique. Tile finesse of the cavity is measured by tile heterodyne cavity ring-down spectroscopy technique. The linewidth of the 555.8-nm laser is investigated. Alter the laser is locked, the laser line width is reduced to about 3 kHz. This frequency-stabilized 555.8-nm laser is used in experiments on the laser cooling and trapping of ytterbium atoms to develop an ytterbium optical clock. 相似文献
18.
An electromagnetically induced transparency (EIT) signal is observed in a V-type energy level scheme in a cesium vapor cell at room temperature. The effects of frequency detuning and the intensity of the pump laser on the EIT signal have been investigated. The performance of the probe-diode laser system, which is frequency stabilized on the EIT signal by using electrical feedback, is explored. The first derivative of the EIT signal offers a steeper slope and better S/N ratio for laser frequency stabilization than that of the Doppler-free hyperfine and crossover resonances. A comparative study of the frequency stability of an external-cavity diode laser stabilized at EIT and at the crossover resonance is presented. The square root of the Allan variance (σ) vs. integration time (τ) plot shows about a tenfold improvement in the frequency stability of the EIT-locked laser (σ ~ 2.043 × 10?13τ?1/2) over that of the crossover-locked laser under a short integration time (1–10 ms), whereas a twofold improvement is found under a long integration time (~1 s). 相似文献
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