研究目的
To measure the linear Stark shift coefficient of the 4F9/2–4I15/2 transition of Er3+ ion in Y2SiO5 using the photon echo beating method.
研究成果
The linear Stark shift coefficient for the 4F9/2–4I15/2 transition of Er3+ in Y2SiO5 was measured as 14.3 ± 0.7 kHz V?1 cm using the photon echo beating method. This is the first measurement of this coefficient for Er3+ in Y2SiO5, providing valuable data for applications like quantum memory and spectral hole burning. The method demonstrates high accuracy and potential for use in other transitions, such as at 1.5 μm.
研究不足
The accuracy of measurements is affected by factors such as jitter between laser and electric pulses, and errors in pulse amplitude measurement (approximately 2%). The pulse shape from the generator was not perfectly rectangular and depended on the load, requiring precise recording for each configuration. The method is sensitive to the exact timing and shape of the electric field pulse.
1：Experimental Design and Method Selection:
The experiment utilized the photon echo beating method to measure the Stark shift. A pulsed electric field was applied to split the optical transition levels, and the splitting frequency was determined from the beat period of the photon echo signal. Theoretical models based on the Stark effect and Lorentz correction were employed.
2：Sample Selection and Data Sources:
Erbium-doped Y2SiO5 monocrystals with 0.005 at.% Er3+ concentration were used, grown by the Czochralski method. The sample was cut to a thickness of 1.30 mm perpendicular to the b axis.
3：005 at.% Er3+ concentration were used, grown by the Czochralski method. The sample was cut to a thickness of 30 mm perpendicular to the b axis.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a tunable dye laser (Oksazin 17), a digital oscilloscope (Tektronix TDS 2022), a high-speed photodetector, a capacitor with copper plates, and a pulse generator based on avalanche transistors (Arkadiev–Marx scheme). Materials included the Y2SiO5:Er3+ crystal and components for the pulse generator.
4：Experimental Procedures and Operational Workflow:
The experiment was conducted at 2 K. Laser pulses at 657.87 nm wavelength were used to excite the sample, with the electric field of the laser polarized parallel to the b axis. A pulsed electric field was applied using the capacitor, and the photon echo signal was recorded with the oscilloscope. The pulse generator produced electric field pulses with amplitudes up to 544 V, and the shape of these pulses was recorded for accurate analysis. Data were accumulated 64 times and processed in LabView.
5：87 nm wavelength were used to excite the sample, with the electric field of the laser polarized parallel to the b axis. A pulsed electric field was applied using the capacitor, and the photon echo signal was recorded with the oscilloscope. The pulse generator produced electric field pulses with amplitudes up to 544 V, and the shape of these pulses was recorded for accurate analysis. Data were accumulated 64 times and processed in LabView.
Data Analysis Methods:
5. Data Analysis Methods: The Stark shift coefficient was determined by comparing the experimental photon echo beat patterns with theoretical predictions derived from equation (3) in the paper. The area under the electric field pulse was used to calculate the splitting frequency, and the coefficient was extracted by fitting the minima of the beat pattern.
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