共查询到19条相似文献,搜索用时 109 毫秒
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532nm全固化激光器碘吸收频率稳定的研究 总被引:1,自引:0,他引:1
用激光二极管(简称LD)作为抽运光源,Nd:YAG和Nd:YVO4晶体作为激光工作物质,KTP晶体作为倍频晶体,获得了532nm的单频绿光输出。两者的功率分别为2—3mW和5—6mW。将绿光单次通过碘吸收室时,经过控制和调谐激光频率,已检测到碘的多普勒加宽吸收谱线,谱线宽度约为800MHz。在激光器的压电陶瓷(PZT)上,加上交流调制信号和直流扫描电压,通过信号检测、相敏检波、积分和高压放大等伺服回路,实现了在多普勒曲线中心处的频率稳定。 相似文献
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用Nd:YVO4/KTP腔内倍频环形激光器产生的532nm波长激光,探测到了波长在532.170nm至532.200nm范围的一系列碘的多普勒吸收谱线和饱和吸收谱线。理论计算出相应的波长值和超精细谱线结构参数。理论计算值与实验测量数据在较高的精度内相一致。用三次谐波锁定的稳频电路实现了该激光器在碘饱和吸收线超精细分量上的频率稳定。 相似文献
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碘-127稳频640nm氦氖激光器的研究(英文) 总被引:1,自引:1,他引:0
使用自行研制的~3He-~(22)Ne激光管,首次在640nm波段发现了碘-127分子强的超精细结构谱线。我们从理论上对这些谱线进行了分类计算,确认它们属于碘-127分子P(10)8-5和R(16)8-5超精细结构能级的跃迁。通过对这些超精细谱线频率间隔的精确测量,从理论上修正了碘-127分子的超精细结构耦合常数。用修正后的耦合常数计算的谱线间隔值与实验值的标准偏差仅为32kHz。用这些谱线中的a_9分量作为频率参考谱线,研制成功了碘-127饱和吸收稳频640nm氦氖激光器,其频率稳定性为8×10~(-12)(平均时间10秒),频率重复性优于1×10~(-11)。并测量了它的波长值。碘-127稳频640nm激光器有可能为复现新米定义和为激光光谱学提供一条新的波长标准。 相似文献
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用外腔半导体激光器观测到1.5μm波段乙炔(C2H2)分子10条吸收谱线,对各谱线中心波长进行准确定标;对1.53159μm的吸收线性质做了初步研究。对外腔半导体激光器的频率实现了分子诺线稳频,在1.53159μm吸收谱线上,锁定后激光器的频率变化≤±2MHz 相似文献
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Kim JT Zhen L Kapitanov V Kim HS Park JR Park SH 《Journal of nanoscience and nanotechnology》2006,6(11):3559-3561
The Rubidium saturated absorption spectra for D2 transition lines are used to measure the Fabry-Perot interferometer free spectral range (FSR). The scale linearity of the laser frequency tuning is determined. The Sagnac interferometer has been used for the laser stabilization. The result shows that the laser frequency is stabilized upto sub-mega Herz level. Also the hyperfine structure [5(2)S(1/2) F = 3 --> F' = 2, 3, 4 5(2)P(3/2) 85Rb] of the rubidium atom has been measured by using the tilt locking method, which shows the same result as the conventional saturation spectroscopy. 相似文献
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Through the use of continuous diode laser absorption, detection of transient fluorine atoms with an initial number density in the range of 10(14) cm(-3) has been demonstrated. A crucial part of the continuous-detection technique was laser frequency stabilization with a reference cell of atomic fluorine with Zeeman modulation of the absorption lines to generate a feedback signal. Long-term wavelength stability was demonstrated with second-harmonic phase-sensitive detection of the second-derivative signal for periods up to several hours. For determination of the short-term wavelength stability in the range of microseconds to seconds, a transient signal was generated by photolysis of F(2) with an excimer laser at 308 nm. The initial diode laser absorption was compared to a calculated value obtained from the measured excimer laser fluence, the known dissociation cross section of F(2), and the atomic fluorine absorption cross section, which included a statistical population distribution, the finite bandwidth of the laser dode, and the effects of pressure broadening. The observed absorption was approximately 33% less than the calculated value, possibly because of the diode laser's wavelength instability on the time scale of a few seconds, which is consistent with an observed amplitude instability from pulse to pulse when pulsed at 1-10 Hz. 相似文献
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Schilt S Matthey R Kauffmann-Werner D Affolderbach C Mileti G Thévenaz L 《Applied optics》2008,47(24):4336-4344
A simple, easy-to-implement, and robust technique is reported to offset lock two semiconductor lasers with a frequency difference easily adjustable up to a couple of tens of gigahertz (10 and 19 GHz experimentally demonstrated). The proposed scheme essentially makes use of low-frequency control electronics and may be implemented with any type of single mode semiconductor laser, without any requirement for the laser linewidth. The technique is shown to be very similar to the wavelength modulation spectroscopy method commonly used for laser stabilization onto molecular absorption lines, as demonstrated by experimental results obtained using 935 nm laser diodes. 相似文献
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We demonstrate a robust method for frequency stabilization of a diode laser by two Doppler-broadened absorption spectra of the cesium D2 line. This technique employs an acousto-optical modulator to generate another frequency component from a diode laser to perform the spectroscopy. The 852-nm diode laser with frequency stabilization at the zero crossing of the error signal showed a peak-to-peak fluctuation of 800 kHz compared with a frequency-stabilized femtosecond laser over a 2-h period. This frequency-locking method is free of modulation and can be applied to frequency discriminators as well as to atomic resonances. 相似文献
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A narrow-linewidth pulsed alexandrite laser has been greatly modified for improved spectral stability in an aircraft environment, and its operation has been evaluated in the laboratory for making water-vapor differential absorption lidar measurements. An alignment technique is described to achieve the optimum free spectral range ratio for the two étalons inserted in the alexandrite laser cavity, and the sensitivity of this ratio is analyzed. This technique drastically decreases the occurrence of mode hopping, which is commonly observed in a tunable, two-intracavity-étalon laser system. High spectral purity (> 99.85%) at 730 nm is demonstrated by the use of a water-vapor absorption line as a notch filter. The effective cross sections of 760-nm oxygen and 730-nm water-vapor absorption lines are measured at different pressures by usingthis laser, which has a finite linewidth of 0.02 cm(-1) (FWHM). It is found that for water-vapor absorption linewidths greater than 0.04 cm(-1) (HWHM), or for altitudes below 10 km, the laser line can be considered monochromatic because the measured effective absorption cross section is within 1% of the calculated monochromatic cross section. An analysis of the environmental sensitivity of the two intracavity étalons is presented, and a closed-loop computer control for active stabilization of the two intracavity étalons in the alexandrite laser is described. Using a water-vapor absorption line as a wavelength reference, we measure a long-term frequency drift (≈ 1.5 h) of less than 0.7 pm in the laboratory. 相似文献
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We report on a calibration procedure that enhances the precision of an interferometer based frequency stabilization by several orders of magnitude. For this purpose, the frequency deviations of the stabilization are measured precisely by means of a frequency comb. This allows us to implement several calibration steps that compensate different systematic errors. The resulting frequency deviation is shown to be less than 5.7?MHz (rms 1.6?MHz) in the whole wavelength interval 750-795?nm. Wide tuning of a stabilized laser at this exceptional precision is demonstrated. 相似文献
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1.5μm乙炔饱和吸收谱线是国际计量委员会(CIPM)正式推荐的光纤通信波段复现‘米’定义的频率参考标准。乙炔稳频激光依据稳频方法可分为线性吸收和饱和吸收两大类,饱和吸收相比线性吸收,能够消除乙炔分子的多普勒效应,获得线宽更窄、频率稳定度和复现性更高的稳频激光,1s频率稳定度能够达到10-13量级,波长漂移为10-12量级。利用13C2H2(ν1+ν3)P(16)谱线,研发的微型气室有望实现稳频激光的全光纤链路传播,为高度集成化、抗干扰能力强的稳频激光源提供了新的发展方向。高性能的1.5μm近红外稳频激光直接为密集波分复用系统、精密光纤传感等多个领域提供波长参考源,结合飞秒激光频率梳技术可进一步完善光纤通信中激光波长量值传递溯源体系,提升激近红外波段光波长的测量能力,为光纤波段的精密测量提供量值保障。 相似文献