研究目的
To demonstrate wavelength-wavelength correlations of classical broad-band amplified spontaneous emission photons from an erbium-doped fiber amplifier and apply them in a ghost spectroscopy experiment to reproduce absorption features of acetylene, confirming the generalization of ASE sources for classical ghost spectroscopy.
研究成果
The experiment successfully generalized the use of ASE from an EDFA for ghost spectroscopy, demonstrating wavelength-wavelength correlations and reproducing acetylene absorption features. This confirms ASE sources as attractive for classical ghost spectroscopy, with potential applications in various fields, though performance can be improved with higher-power sources.
研究不足
The spectral resolution is limited by the bandwidth of the interference filters and reference beam, preventing resolution of very narrow absorption lines. Optical power limitations lead to increased error bars at peripheral wavelengths. The concept is classical with trade-offs in simplicity versus performance.
1：Experimental Design and Method Selection:
The experiment uses a ghost spectroscopy setup with an EDFA as the light source, exploiting spectral correlations of ASE light. It involves interferometric two-photon absorption detection for ultra-fast correlation measurements.
2：Sample Selection and Data Sources:
Acetylene gas is used as the sample due to its absorption features matching the EDFA emission spectrum. A high-pressure gas cell is employed.
3：List of Experimental Equipment and Materials:
EDFA, collimating lenses, linear polarizer, beam splitter, diffraction grating, fiber couplers, motorized translation stage, photomultiplier tube (PMT) with GaAsP photocathode, longpass filter, gas cell with CaF2 windows, interference bandpass filters, échelette grating, cylinder lenses.
4：Experimental Procedures and Operational Workflow:
Light from the EDFA is collimated, polarized, split into reference and object beams. The object beam passes through the gas cell and is coupled into a fiber for bucket detection. The reference beam is spectrally resolved using a grating or filters. Both beams are combined and focused onto the PMT for TPA detection. Intensity correlations are measured by varying the optical delay and reference wavelength.
5：Data Analysis Methods:
Intensity correlations are analyzed using the second-order correlation function g(2)(τ). Data is processed with low-pass filtering and FFT to extract G(2)(τ). The Bravais-Pearson correlation coefficient is used to evaluate the relationship between g(2) and transmission.
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