Full text loading...
DFG tuning curve. A solid-state laser is used for the pump and a tunable laser diode for the signal.
Relationship between poling pitch and QPM wavelength.
Experimental setup for methane gas detection. LD, laser diode; EDFA, Er-doped fiber amplifier; WG, waveguide; BS, beam splitter.
Output spectra through (a) methane gas cell and (b) vacuum cell.
Absorption spectrum of methane gas. The pressure is , and the cell length is .
Article metrics loading...