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Stable Narrow Linewidth 689nm Diode Laser for the Second Stage Cooling and Trapping of Strontium Atoms 下载免费PDF全文
We report stable narrow linewidth laser systems based on self-developed Littman configuration external cavity diode lasers (ECDLs). The frequency of the ECDL is stabilized to a high fineness ultralow-expansion glass reference cavity with the Pound-Drever-Hall technique. By heterodyne beating of two identical systems, we conclude that the linewidth 4.3× 10^-14 at an averaging measurement time. of each ECDL is reduced to lower than 150 Hz and its frequency stability reaches time of 1 s, the averaged long-term frequency drift is less than 0.2 Hz/s over 30 h 相似文献
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实验利用商品光纤飞秒激光器,自行构建了一套完整的光学频率梳系统,并获得了约30 dB信噪比的系统频移(fceo)信号.实现了光频梳重复频率(frep)信号及系统频移(fceo)信号的高稳定度锁定,并通过实验验证了光频梳锁定的跟踪精度.基于此稳定光频梳完成了对1064 nm碘稳频Nd:YAG固体激光器的绝对频率测量.实验结果表明,frep的跟踪精度在100 s取样时间时优于3.7×10-14,测量得到的1064 nm激光器绝对频率为:281630111757362 Hz.这一测量结果与国际计量委员会(CIPM)给出的国际推荐值符合到不确定度之内.
关键词:
光纤光频梳
稳频
锁相技术
光学频率计量 相似文献
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褐煤蜡树脂中多环芳烃组织的研究 总被引:1,自引:1,他引:0
采用气相色谱法对云南寻甸褐煤炭树脂和吉林舒兰褐煤蜡树脂,进行了多环芳烃分布特征的研究,从树脂中鉴定出68个化合物的同系物。两个树脂样均以菲系化合物占有优势,舒兰树脂中菲系列量约三倍于寻甸树脂的相应量。 相似文献
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We show two external cavity-enhanced second-harmonic generations of 922 nm with periodically poled potassium titanyl phosphate crystal,whose doubling cavities are locked separately with Hansch-Couillaud and intra-modulation methods.The outputs of second-harmonic generation reach 310 mW,54.8%of the conversion efficiency from the Ti:sapphire laser with the crystal length of 10 mm,and 208 mW,59% of the conversion efficiency from the MOPA system with the crystal length of 30 mm.It consists of heterodyning the Ti:sapphire laser and the MOPA system,and compares the phase of the beat frequency signal with the phase of a reference RF local oscillator.The resulting phase error is used as a feedback signal and fed back to the reference cavity of the Ti:sapphire laser to lock the two lasers in phase.A stable blue power of 520 mW is obtained,which supplies enough power for the cooling and trapping step of the strontium (Sr)optical lattice clock.Four stable isotopes of Sr, 84 Sr, 86 Sr, 87 Sr,and 88 Sr,are detected by probing the laser during a strong 460.7-nm cycling transition(5s 21 S0?5s5p 1 P1). 相似文献
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C306型甲醇合成催化剂制法研究及其工业效果 总被引:15,自引:5,他引:10
对甲醇合成催化剂的铜锌母体及氧化铝载体的制备方法进行研究,结果表明:新方法制备的母体呈现较多的(Cu,Zn)2CO3(OH)2晶相,其样品表面的Cu/Zn比值较高,使样品催化活性提高10-28%,新方法制备的载体使样品具有较大的比表面,而分别使活性提高8-16%,更使其过热后活性提高26%-55%,由此研究开发的C306型甲醇合成催化剂,代替从德国或丹麦进口的产品,迅速推广应用到15甲醇厂,总生产能力达880kt/a,获得显著的增产节能效果。 相似文献
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A Hertz-Linewidth Ultrastable Diode Laser System for Clock Transition Detection of Strontium Atoms 下载免费PDF全文
The frequencies of two 698 nm external cavity diode lasers (ECDLs) are locked separately to two independently located ultrahigh finesse optical resonant cavities with the Pound Drever-Hall technique. The linewidth of each ECDL is measured to be -4.6 Hz by their beating and the fractional frequency stability below 5 × 10^-15 between 1 s to lOs averaging time. Another 698nm laser diode is injection locked to one of the cavity-stabilized ECDLs with a fixed frequency offset for power amplification while maintaining its linewidth and frequency characteristics. The frequency drift is H1 Hz/s measured by a femtosecond optical frequency comb based on erbium fiber. The output of the injection slave laser is delivered to the magneto-optical trap of a Sr optical clock through a iO- ta-long single mode polarization maintaining fiber with an active fiber noise cancelation technique to detect the clock transition of Sr atoms. 相似文献