Abstract
A mid-IR multiwavelength difference frequency generation (DFG) laser source with fiber laser fundamental lights is demonstrated by using the dispersion property of PPLN to broaden the quasi-phase-matching (QPM) acceptance bandwidth (BW). Our results show that the QPM BW for the pump YDFL is much larger than that for the signal EDFL. Using a multiwavelength YDFL and a single-wavelength EDFL as the pump and the signal lights, the DFG laser source can simultaneously emit 14 mid-IR wavelengths with the spacing of 14 nm at a fixed PPLN temperature. Moreover, mid-IR multiwavelength lasing lines can be synchronously tuned between 3.28 and 3.47 microm.
Highlights
Continuous-wave 3-5μm mid-infrared laser sources are very useful for applications in spectroscopy, optical sensing and detection [1,2]
A mid-IR multiwavelength difference frequency generation (DFG) laser source with fiber laser fundamental lights is demonstrated by using the dispersion property of periodically poled LiNbO3 (PPLN) to broaden the quasi-phase-matching (QPM) acceptance bandwidth (BW)
Our results show that the QPM BW for the pump YDFL is much larger than that for the signal EDFL
Summary
Continuous-wave 3-5μm mid-infrared (mid-IR) laser sources are very useful for applications in spectroscopy, optical sensing and detection [1,2]. We shall show how to broaden the QPM BW of a normal uniform grating PPLN for such a DFG laser source by using the dispersion property of PPLN, and which one should operate in multiwavelength mode for the two fiber laser fundamental lights. With a multiwavelength ytterbium-doped fiber laser (YDFL) as the pump light and a single wavelength erbium-doped fiber laser (EDFL) cascaded by an erbium-doped fiber amplifier (EDFA) as the signal light, our DFG laser source, which is based on a uniform grating PPLN can simultaneously emit 14 lasing lines with the spacing about 14nm near 3.3μm when the temperature of the PPLN is fixed at 73.5°C. The multiwavelength mid-IR lasing lines can be tuned synchronously between 3.28 and 3.47μm by changing the wavelength of the signal light
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