低温条件下光学厚度对Tm3+：YAG材料光谱烧孔孔深的影响

通过理论与实验研究了光学厚度对Tm3+：YAG材料光谱烧孔孔深的影响。提出了一种用于分析光学厚度对光谱烧孔孔深影响的新模型。该模型从理论上推导了烧孔孔深与光学厚度的关系。根据提出的理论模型,当温度大于4K时,通过选择合适的光学厚度可以使光谱烧孔孔深得到最大值。最后通过使用合适的激光与Tm3+：YAG材料所形成的光谱烧孔实验证明了实验结果与理论分析是相一致的。     

Measurement of frequency stability in tunable lasers by using an F-P interferometer

A method for measuring the frequency stability of tunable laser is proposed by using confocal Fabry-Perot（F-P）interferometer.The F-P interferometer is used to get the output frequency of the laser as a reference,and the method eliminates the need of an independent optical source as a frequency reference.Using this technique,the frequency stability of the tunable external-cavity diode laser（ECDL）is measured to be 2.26×10~（-9）with an integration time of 20 ms.     

Characterization of spectral hole depth in Tm^3＋ ：YAG within the cryogenic temperature range

In this paper, spectral hole depth dependence on temperature below 10 K in Tm^3＋ ：YAG crystal is investigated in detail. A novel model is proposed to analyze the temperature dependence on the spectral hole. By using the proposed model, we theoretically deduce the temperature dependence of spectral hole depth. The results are compared with experimental results and they are in good agreement. According to the theoretic results, the optimum temperature in experiment can be found.     

低温条件下光学厚度对Tm3+:YAG 材料光谱烧孔孔深的影响

通过理论与实验研究了光学厚度对Tm3+:YAG 材料光谱烧孔孔深的影响.提出了一种用于分析光学厚度对光谱烧孔孔深影响的新模型.该模型从理论上推导了烧孔孔深与光学厚度的关系.根据提出的理论模型,当温度大于4 K时,通过选择合适的光学厚度可以使光谱烧孔孔深得到最大值.最后通过使用合适的激光与Tm3+:YAG 材料所形成的光谱烧孔实验证明了实验结果与理论分析是相一致的.     

Characteristics of spectral-hole burning in Tm3+:YAG based on the perturbation theory

In this paper, the physical mechanism of the interaction between electromagnetic wave and spectral-hole burning crystal material is investigated in detail. In the small signal regime, a perturbation theory model is used to analyze the mechanism of spectral-hole burning. By solving the Liouville equation, three-order perturbation results are obtained. From the theoretic analysis, spectral-hole burning can be interpreted as a photon echo of the zero-order diffraction echo when the first optical pulse and the second optical pulse are overlapped in time. According to the model, the spectral-hole width is dependent on the chirp rate of the reading laser. When the chirp rate is slow with respect to the spectral features of interest,the spectral hole is closely mapped into time domain. For a fast chirp rate, distortions are observed. The results follow Maxwell–Bloch model and they are also in good agreement with the experimental results.     

Characterization of spectral hole depth in Tm3+:YAG within cryogenic temperature range

In this paper, spectral hole depth dependence on temperature below 10 K in Tm³⁺:YAG crystal is investigated in detail. A novel model is proposed to analyze the temperature dependence on spectral hole. By using the proposed model, we theoretically deduce the temperature dependence of spectral hole depth. The results are compared with experimental results and they are in good agreement. According to the theoretic results, the optimum temperature in experiment can be found.