The OPO-MIR-341 from LD-PD Inc is a MIR Widely Tunable Single Frequency Fiber Laser that operates at a central wavelength of 3400 nm. It delivers an output power of up to 1 W (at 3.4 µm) and has a power stability of 1 % RMS. This continuous wave supercontinuum laser has a beam quality factor of less than 1.1 and polarization ratio above 20 dB. It has a tuning range of 300 nm and power adjust range of 10 % - 100 %. This laser is based on optical parameter oscillation (OPO) and operates in free space mode with a diffraction-limited beam. It is ideal for gas sensing, atmospheric remote sensing, biomedical analysis, and test & measurement applications.