研究目的
To develop a frequency tunable external-cavity diode laser (ECDL) using a narrow bandwidth interference filter for resonance ionization spectroscopy of strontium (Sr) with high isotopic selectivity.
研究成果
The developed IF-ECDL demonstrated better wavelength stability and single mode stability compared to the Littrow-type ECDL, making it a promising laser source for the background-free analysis of radioactive 90Sr in marine samples. High 90Sr isotopic selectivity of ～104 with respect to 88Sr is expected in the 689.4 nm transition.
研究不足
The manufacturing accuracy of the IF-ECDL is not comparable to commercial Littrow-type ECDLs, and the single mode laser output power for Sr atomic spectroscopy is limited to only a few milliwatts.
1：Experimental Design and Method Selection:
The study involved the development of an interference-filter-type ECDL (IF-ECDL) and comparison with a Littrow-type ECDL in terms of wavelength stability and single mode stability. Theoretical models and experimental procedures were employed to confirm the improved characteristics of the IF-ECDL.
2：Sample Selection and Data Sources:
The study focused on the resonance ionization spectroscopy of strontium (Sr) atoms, specifically the dominant isotope 88Sr, using the developed IF-ECDL.
3：List of Experimental Equipment and Materials:
The equipment included a Thorlabs HL6750MG laser diode, OptoQuest bandpass filter, Sigma Koki partially reflective mirror, and a home-made Fabry-Perot interferometer among others.
4：Experimental Procedures and Operational Workflow:
The IF-ECDL was constructed and its performance was compared with a Littrow-type ECDL using a wavelength meter and a Fabry-Perot interferometer. The spectral profile of 88Sr was measured using the IF-ECDL.
5：Data Analysis Methods:
The spectral profile of 88Sr was fitted with a Voigt profile to analyze the Gaussian and Lorentzian components of the spectrum width.
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GH13-18V diffraction grating
GH13-18V
Thorlabs
Wavelength separation in Littrow-type ECDL
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Sigma Koki partially reflective mirror
?10 mm, t3 mm, R:T = 20%:80%
Sigma Koki
Optical feedback in IF-ECDL
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HighFinesse WS-U wavelength meter
WS-U
HighFinesse
Wavelength monitoring
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Thorlabs MDT694B piezocontroller
MDT694B
Thorlabs
Control of piezoactuator for interferometer
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HL6750MG
HL6750MG
Thorlabs
Laser diode for ECDL construction
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350230-B aspheric lens
350230-B
Thorlabs
Collimation of the emitted light from the laser diode
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OptoQuest bandpass filter
5 × 5 × t1 mm
OptoQuest
Narrow bandwidth filtering in IF-ECDL
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NF multifunction generator WF1973
WF1973
NF
Generation of triangular wave voltage for interferometer
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