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Mid-IR multiwavelength difference frequency generation based on fiber lasers.

Jian Jiang¹, Jianhua Chang, Sujuan Feng

¹Anhui provincial Key Lab of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, China

|April 15, 2010

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This study demonstrates a mid-infrared multiwavelength laser source using difference frequency generation (DFG). The novel approach broadens the quasi-phase-matching bandwidth, enabling simultaneous emission of 14 wavelengths tunable between 3.28 and 3.47 micrometers.

Area of Science:

Optics and Photonics
Laser Physics
Nonlinear Optics

Background:

Difference frequency generation (DFG) is a key technique for generating mid-infrared (mid-IR) light.
Quasi-phase-matching (QPM) in periodically poled lithium niobate (PPLN) is crucial for efficient nonlinear frequency conversion.
Broadening the QPM acceptance bandwidth is essential for multiwavelength generation.

Purpose of the Study:

To demonstrate a mid-IR multiwavelength DFG laser source utilizing fiber laser fundamental lights.
To leverage the dispersion property of PPLN to broaden the QPM acceptance bandwidth.
To achieve simultaneous multiwavelength emission and tunable operation in the mid-IR spectrum.

Main Methods:

Utilizing a multiwavelength ytterbium-doped fiber laser (YDFL) as the pump and a single-wavelength erbium-doped fiber laser (EDFL) as the signal.

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Employing the dispersion property of PPLN to enhance the quasi-phase-matching (QPM) acceptance bandwidth (BW).

Operating the DFG laser source at a fixed PPLN temperature to achieve simultaneous multiwavelength emission.

Main Results:

The QPM acceptance bandwidth for the pump YDFL was found to be significantly larger than that for the signal EDFL.
The DFG laser source successfully emitted 14 simultaneous mid-IR wavelengths with a 14 nm spacing.
The mid-IR multiwavelength lasing lines were synchronously tuned across a range of 3.28 to 3.47 micrometers.

Conclusions:

The demonstrated DFG laser source effectively broadens the QPM acceptance bandwidth by utilizing fiber laser dispersion properties.
Simultaneous multiwavelength emission and tunable operation in the mid-IR range were successfully achieved.
This technology offers a promising avenue for applications requiring versatile mid-IR light sources.