Continuous-wave Comb Fourier Transform Spectroscopy

absorption achieve amplifier amplitude approach bands bandwidth basic beating frequencies beating pair beating signal broad cavity lengths chapter combination compared consisting constant CW c-FTS CW frequency comb dependent detector dispersion domain effect etalon experiment experimental setup fiber field Figure filter Fourier transformation frequency comb frequency resolution fringes gain grating compressor higher hyperspectral light source imaging intensity interference laser lasing lasing spectra linear optical amplifier lines lower measurement mirror mode locked mode spacing modulation monitored moving noise obtained operation optical frequency optical spectrum analyzer order replica oscilloscope output parameters performance phase polarization Power a.u. presented range recorded reference reflected repetition rates resolving ring cavity rotating shows simulation spaced spectral analysis spectral coverage spectral resolution spectrometers spectroscopy speed temperature trace transmitted unequally spaced unique wavelength