A compact master-oscillator power-amplifier semiconductor laser (MOPA-SL) is a good candidate for a coherent light source (operating at 1550 nm) in a Doppler wind Lidar. The MOPA-SL requires two injection currents: Idfb for the distributed-feedback (DFB) laser section (master oscillator) and Iamp for the tapered amplifier section. The specified maximum current values are 0.7 A and 4.0 A for Idfb and Iamp. Although the MOPA-SL has been proven capable of producing single-frequency CW output beam, stable operation at this spectral condition has also been known to highly depend on the drive currents to the laser. This was done by observing the spectral characteristic of the laser using an optical spectrum at different drive current combinations. When using the laser for a Doppler wind Lidar application, a combination of (Idfb, Iamp) which is close to the center of an identified stable single-frequency regime is used. The current settings for the laser result in a highly stable Lidar as shown by a 5-day long continuous measurement of the Doppler shift produced by a constantly rotating diffusely reflecting target.
|Title of host publication||Conference abstract series, CLEO/Europe - EQEC|
|Publication status||Published - 2009|
|Event||European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference 2009 - Munich, Germany|
Duration: 14 Jun 2009 → 19 Jun 2009
|Conference||European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference 2009|
|Period||14/06/2009 → 19/06/2009|