Laser Gain and Intra-cavity Losses of the ELBE Mid-IR FEL


Laser Gain and Intra-cavity Losses of the ELBE Mid-IR FEL

Lehnert, U.; Michel, P.; Seidel, W.; Teichert, J.; Wünsch, R.

The the U27-FEL of the ELBE radiation source allows to choose between five mirrors with different outcoupling holes. This allows to adapt the optical resonator to the required wavelength range to ensure the needed laser gain and to optimize the outcoupled laser power. Another parameter which influences the achievable laser gain and output power is the detuning length of the optical cavity. While for CW operation often the minimum detuning point is choosen which maximizes the outcoupled power, for pulsed-mode operation about one wavelength of cavity detuning maximizes the laser gain and yields best stability of the laser. To gain some insight into the behavior of the optical resonator we have measured the round-trip losses and the net laser gain and compare both to calulations. For the measurements we have used a fast-readout MCT detector to measure the decay and rise-time of the outcoupled infrared beam caused by a 10μs break in the electron beam micro-pulse train. We show gain and loss for 5, 10 and 20μm wavelength with the typical detuning curves of an FEL.

  • Poster
    28th Free Electron Laser Conference 2006, 27.08.-01.09.2006, Berlin, Germany
  • Contribution to proceedings
    28th Free Electron Laser Conference 2006, 27.08.-01.09.2006, Berlin, Germany
    Proceedings of the 28th International Free Electron Laser Conference, 339-340

Permalink: https://www.hzdr.de/publications/Publ-8840
Publ.-Id: 8840