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Real-time absorption and dispersion dual-comb spectroscopy is achieved in the 3-μm region without mode-locked lasers or active stabilization. The resolved lines of flat-top frequency combs with adjustable line-spacing and tunable center wavelength enable precise spectroscopy.
We demonstrated the Doppler-free intermodulated fluorescence spectroscopy of the 4He 23P→31D transitions using a one-watt compact laser system at 588 nm. The power-dependent spectra of the 23P→33D transitions were studied and the Doppler-free spectrum of the 23P→31D transitions was first achieved.
We have observed the saturated absorption spectrum of the He-4 23S1-33P0,1,2 hyperfine transitions in a RF-discharged helium cell using a 6-mW 389-nm laser. The linewidth broadening due to power were investigated.
We have demonstrated Doppler-free intermodulated fluorescence spectroscopy of helium 2 3 P–3 1,3 D transitions in an rf-discharged sealed-off cell using a compact laser system at 588 nm. An external cavity diode laser at 1176 nm was constructed to seed a Raman fiber amplifier. Laser power of more than 1 W at 588 nm was produced by frequency doubling of the fiber amplifier...
This study presents a 2.06 μm single-frequency tunable volume Bragg grating (VBG)-based short-cavity Tm:Ho:YLF laser. A mode-hop-free tuning range of 10 GHz at a few hundred mW output power was achieved. The first-derivative spectrum of the CO2 20013←00001 R(4) absorption line with a signal-to-noise ratio (SNR) of 1,000/Hz1/2 was obtained using frequency modulation and fluorescence detection. The...
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