CKWIND 1550nm Single Frequency Fiber Laser for Coherent Doppler LIDAR

Techwin CKWIND 1550nm High Power Single Frequency Fiber Laser Module for Coherent Doppler LIDAR

Techwin CKWIND Series 1550nm High Power Single Frequency Fiber Laser Module is an OEM modular narrow linewidth fiber laser designed for short range high precision Coherent Doppler Wind LiDAR applications. Eye-safety working wavelength, single-frequency single longitudinal mode works with a long coherence length. The standard products use polarization-maintaining fiber output, high polarization extinction ratio (PER), output power up to 2W.

Techwin CKWIND series 1550nm high-power single-frequency fiber laser module uses the main oscillator power amplifier (MOPA) structure design. The DFB fiber laser seed has single-frequency, very low phase noise, narrow linewidth characteristics, and the cascaded low noise polarization-maintaining fiber amplifiers for power boosting. The modular design is compact and sturdy, suitable for use in a variety of harsh environments, typically used in wind power Coherent Wind LiDAR, airborne wind LiDAR and so on.

Coherent Doppler LiDAR (CDL) has proven to be a powerful tool for remote sensing of the atmosphere, and has been widely adopted in applications such as measuring atmospheric wind velocity, turbulence, aerosol concentration, cloud height and velocity, and detection of atmospheric constituents and pollutants. The CDL systems have been developed for remote sensing measurements since the late 1960’s. The first CDL wind-sensing system was reported by Huffaker et al  where a 10.6 μm cw CO₂ laser was used. CO₂-laser-based CDL systems have been used for airborne clear air wind and hard target measurements such as ranging and produced valuable results for a long time. Since the late 1980s, CDL systems with newly developed solid-state lasers attracted a lot of researchers due to advantages of size, weight, reliability, and lifetime.

Operation at shorter wavelengths allows for higher spectral resolution, which means higher velocity resolution. A lot of effort has been put into 2 μm pulsed systems mainly intended for wind measurements. Kavaya et al developed a 1.06 μm pulsed CDL system that realized a measurable range of a few tens of kilometers used for launch-site wind sensing. Karlsson et al. reported a 1.5 μm cw all-fiber wind sensing CDL system, which utilized optical fiber components used in telecommunication systems.