Compact and Tunable Mid-IR Light Source Based on a Dual-Wavelength Fiber Laser

Abstract

A compact, tunable mid-IR difference-frequency generation (DFG) light source based on a dual-wavelength fiber laser and a 5mol% MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal is developed and evaluated. An output power of 233 𝜇W is achieved with a conversion efficiency of 0.1%/W. The mid-IR wavelength can be tuned between 3308 nm and 3314 nm by changing the temperature of a pair of fiber Bragg grating (FBG) taking as cavity mirrors in the dual-wavelength fiber laser from 26.5 ∘ C to 106.5 ∘ C.

Small-Angle Ultra-Narrowband Tunable Mid-Infrared Absorber Composing from Graphene and Dielectric Metamaterials

“…For example, for solar cell and 2 of 9 photo-detection applications, absorbers are expected to operate within a wide-angle range to collect more incident electromagnetic energy [6][7][8]. On the other hand, similarly to lasers, mid-infrared thermal emission sources based on the metamaterial absorbers are expected to emit near-collimated light, which means that the emissions occur within a small angle range to focus the radiation energy in space [41]. However, to date, no small-angle ultra-narrowband tunable mid-infrared absorber has been reported.…”

Watt-Level Dual-Wavelength Q-Switched Mode-Locked All-Solid-State Tm:CYA Laser

“…Based on the above characteristics, 2 µm band laser is widely used in high-precision surgery [1], free space communication [2], and other fields. In particular, high-power dual-wavelength mode-locked lasers can generate coherent terahertz radiation by difference frequency [3,4], which is widely used in differential radar and remote space detection [5].…”