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采用Pound-Drerer-Hall稳频技术将689 nm激光锁定在高精细度超稳极低膨胀系数材料腔上,实现用于探测锶原子互组跃迁谱的窄线宽激光.利用光腔衰荡光谱技术,测量了不同阶次多横模情况下腔的精细度,并在理论上分析了平凹型Fabry-Perot腔的损耗与多横模阶次的关系.考虑了光开关延时及探测器响应时间在测量中的影响,对腔衰荡时间的实验测量值进行了修正.利用光纤飞秒光频梳测量了激光器的频率漂移,测出窄线宽激光频率稳定度的秒稳优于2.8×10-13.利用窄线宽激光在锶原子束上观测到具有高信噪比的窄线宽原子跃迁谱线,实验测得谱线的线宽为55 kHz,该窄线宽原子谱线可应用于锶原子二级冷却激光绝对频率的精确测量及锶原子互组跃迁谱的四种同位素位移测量.
A 689 nm laser was locked in a high-precision ultra-stable and low-expansion material cavity by using Pound-Drerer-Hall frequency stabilization technique to realize the narrow-line laser for detecting the cross-transition spectrum of strontium atoms. Technique was used to measure the fineness of cavities under different transverse modes and the relationship between the loss of flat concave Fabry-Perot cavities and the order of multi-transverse modes was theoretically analyzed. Considering the optical switch delay and the detector response The experimental measurement of cavity ring-off time was corrected.The frequency drift of the laser was measured by optical fiber femtosecond optical frequency comb.The second-order stability of laser frequency with narrow linewidth was measured to be better than 2.8 × 10-13. Narrow line-width atomic hopping spectra with high signal-to-noise ratio were observed on a strontium atom beam with a narrow linewidth laser. The measured linewidth was 55 kHz, Which is applied to the accurate measurement of the absolute frequency of secondary cooling laser of strontium atom and the measurement of four kinds of isotope displacement of the strontium atomic reciprocal transition spectrum.