研究目的
To measure temperature and pressure in a sealed Ar cell of an optical wavelength calibrator using diode laser spectroscopy, determine fluctuations in the shift of the argon line at 811.5 nm, and assess the calibrator's applicability as an optical reference.
研究成果
The measured fluctuations in the argon line shift are within ±15 MHz, confirming the stability of the optical calibrator and validating previous measurements of pressure shift coefficients. This supports the calibrator's use as a reliable optical reference for spectral device calibration.
研究不足
The study relies on indirect measurements of line shifts through thermodynamic parameters, which may introduce uncertainties. The use of a specific calibrator design and argon gas limits generalizability to other systems. Fluctuations in RF power and potential experimental errors in spectroscopic measurements are noted constraints.
1：Experimental Design and Method Selection:
Diode laser absorption spectroscopy was used for thermometry in a sealed gas discharge cell. The method involved continuous tuning of the laser frequency and analysis of absorption profiles to determine Doppler and Lorentzian broadening contributions.
2：Sample Selection and Data Sources:
A sealed argon gas discharge cell from a laboratory-fabricated optical calibrator, based on a luminescence lamp starter, was used as the sample.
3：List of Experimental Equipment and Materials:
Diode laser (L808P030, Thorlabs), dual controller (ITC4001, Thorlabs), external generator (AKIP-3408/2), liquid-crystal cell, photodiodes, fiber spectrometer (AvaSpec-3648, Avantes), confocal interferometer, data acquisition card (National Instruments), and the optical calibrator cell.
4：Experimental Procedures and Operational Workflow:
The laser beam passed through the argon cell, and signals from photodiodes were recorded. Signals were digitized, processed by division and normalization to obtain absorption profiles, and analyzed using the 'reference point' method to separate broadening contributions. Gas temperature and pressure were calculated from broadening parameters.
5：Data Analysis Methods:
The Voigt profile was used for line shape analysis. Doppler and Lorentzian broadening were separated using measured widths at specific levels. Temperature was calculated from Doppler broadening, and pressure from Lorentzian broadening and temperature, using known coefficients.
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diode laser
L808P030
Thorlabs
Used as the probe radiation source for diode laser spectroscopy to measure absorption in the argon cell.
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dual controller
ITC4001
Thorlabs
Used to supply the laser and stabilize its temperature.
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fiber spectrometer
AvaSpec-3648
Avantes
Part of the control system for monitoring the beam radiation spectrum.
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external generator
AKIP-3408/2
Provided triangular control signal for continuous tuning of the laser frequency.
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data acquisition card
National Instruments
Used to digitize and record signals from photodiodes to computer memory.
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luminescent lamp starter
S2 220/240V, 4-22W
Philips
Used as the sealed gas-discharge cell in the optical calibrator for argon gas discharge.
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