Abstract
Diode pumped fiber lasers are compact reliable light sources and achieve today over 30 W fundamental mode power. Hence, they are attractive for the realization of portable laser Doppler anemometer (LDA) systems with high optical power. We present the application of fiber lasers together with diffraction optics for the realization of a miniaturized achromatic directional LDA system. Different methods for the realization of the directional discrimination of the scattering particle movement were investigated and compared. 1. The use of Bragg cells as frequency shifter and diffractive beam splitter for the realization of a heterodyne technique. 2. The application of a two-wavelength fiber laser and Fourier optical phase shifters for the realization of a homodyne technique. 3. The detection of the position of the scattering particle in the measuring volume by dual-fiber receiving techniques.
| Original language | English |
|---|---|
| Pages (from-to) | 695-696 |
| Number of pages | 2 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3749 |
| Publication status | Published - 1 Jan 1999 |
| Externally published | Yes |
| Event | Proceedings of the 1999 18th Congress of the International Commission for Optics (ICO XVIII): Optics for the Next Millennium - San Francisco, CA, USA Duration: 2 Aug 1999 → 6 Aug 1999 |