Coherent has launched the Legend Elite CEP-stabilised ultrafast amplifier, which is seeded by the Coherent Micra CEP oscillator and delivers a sub-35fs pulse duration with a repetition rate of 1kHz.
Legend Elite CEP is available up to 4W of average power and 4mJ per pulse with more configurations to be released in the near future.
The final carrier envelope offset (CEO) stability depends on the operating environment, with typical laboratory performance better than 200mrad.
Carrier envelope phase (CEP) stabilisation refers to fixing the temporal relationship between the overall ultrafast pulse envelope and the underlying electric field oscillations.
In the Legend Elite CEP, the offset is detected by the well-established f-2f interferometer method, and this feedback signal is used to actively control the dispersion of the amplifier cavity by changing the relative angle of the dispersion compensation gratings.
Successful CEP stabilisation requires low-noise system components and a low-noise operating environment.
Coherent claimed that since Verdi is the only available oscillator pump to provide low noise for CEP operation, it is the only manufacturer capable of providing a complete off-the-shelf solution for this field of research.
Principal applications for the Legend Elite CEP include: attosecond physics, coherent X-ray generation, and several other experiments relying on highly non-linear optical processes.
