The DFB-1690-005 from Sacher Lasertechnik is a Distributed Feedback (DFB) Laser Diode that operates at a wavelength of 1690 nm. It delivers an output power of 5 mW and has a spectral width of 1.5 MHz. This laser diode has a wavelength tuning of 2 nm and slope efficiency of 0.15 mW/mA. It has TE00 mode with a beam divergence of 24 deg (parallel) and 30 deg (perpendicular) at FWHM. This laser diode has a chip length of 300 μm and an emitter width of 3 μm x 1.5 μm. It requires a threshold current of 25 mA and consumes 65 mA of current. This laser diode has a temperature tuning coefficient of 0.12 nm/K and current tuning coefficient of 0.06 nm/mA. It is available in a TO5 housing that measures 18.51 mm x Ø 8.5 mm and is ideal for water vapor spectroscopy, scientific & industrial applications.