CPC G01N 21/31 (2013.01) [G01N 2201/06113 (2013.01)] | 20 Claims |
1. A temporal magnification spectrometer for performing spectroscopic temporal magnification, the temporal magnification spectrometer comprising:
a dual-chirp comb source that produces optical carrier laser light;
a signal leg in optical communication with the dual-chirp comb source and that:
receives the optical carrier laser light from the dual-chirp comb source;
produces a signal comb comprising a series of signal linearly chirped waveforms characterized by a chirp duration τcp and a signal frequency range ΔfSIG; and
interacts the signal comb with a sample over the signal frequency range ΔfSIG to produce a transmitted signal comb;
a local oscillator leg in optical communication with the dual-chirp comb source and that:
receives the optical carrier laser light from the dual-chirp comb source; and
produces a local oscillator comb comprising a series of local oscillator linearly chirped waveforms characterized by the chirp duration τcp and a local oscillator frequency range ΔfLO, such that the local oscillator frequency range ΔfLO is different than the signal frequency range ΔfSIG;
an optical detector in optical communication with the signal leg and the local oscillator leg and that:
receives the transmitted signal comb from the signal leg;
receives the local oscillator comb from the local oscillator leg; and
produces an RF domain signal from mixing the transmitted signal comb and the local oscillator comb; and
a temporal magnification analyzer in communication with the optical detector and that:
receives the RF domain signal from the optical detector;
subjects the RF domain signal to a Fourier transform to produce an RF comb comprising a series of RF linearly chirped waveforms;
samples the RF comb to produce sampled RF comb lines from the RF comb;
normalizes the magnitude and phase response of the sampled RF comb lines and produces temporally magnified sample frequency domain data from the sampled RF comb lines;
subjects the sampled RF comb lines to an Inverse Fourier transform to produce intermediate sample temporal data; and
normalizes the magnitude and phase response of the intermediate sample temporal data to produce a steady-state sample spectral response from the intermediate sample temporal data.
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