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Experimental setup. OI: optical isolator; OF: optical fiber; HP: half wave plate; PBS: polarization beam splitter; NDF: neutral densities filter; APD: avalanche photodiode; and Ref.: is the reference signal to demodulate the input signal from the APD by the lock-in amplifier. The power of PA laser is controlled by HP and PBS cooperated with a power meter. The inset sketch on the right corner shows the fluorescence spectra with different PA laser intensities 160 W/cm2, 80 W/cm2, 40 W/cm2, and 10 W/cm2, respectively. The vertical purple line is the position of the reference point.
(a) The trap loss spectroscopy of vibrational level v = 17 in the Cs2 long-range 0g − state with IPA = 160 W/cm2. The red vertical line shows the 9.2 MHz red detuning position to rotational progression J = 2. (b) The fluorescence variation on the PA laser power density. (c) The saturation effect appears when the PA laser intensity is sufficiently large. The saturation intensities IS ∼ 92 W/cm2 are obtained by fitting the measured experimental data. (d) Fitting of the amplitude of fluorescence to the model by Bohn and Julience, as in Ref. 12. The fitting results of LIFS rate = −113 ± 42 MHz/(kW cm−2). (e) The LIFS as a function of PA laser intensity for the rovibrational level of v = 17, J = 2 of Cs2 0g − long-range state.
(a) The fluorescence intensity as a function of the PA laser intensity for different molecular rotational progressions (J = 1, 2, 3, 4) of v = 17 vibrational bound states of the Cs2 0g − long-range state. The color curves are fittings plotted in accordance with formula (2). The inset sketch shows the LIFS rate achieved in the same experimental conditions. (b) The fluorescence intensity as a function of the PA laser intensity for different molecular vibrational levels (v = 4, 17, 32, 44) of the same rotational progression J = 2 of the Cs2 0g − long-range state. The color curves are fittings plotted in accordance with formula (2). The inset sketch shows the LIFS rate achieved in the same experimental conditions.
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