Legend HE Cryo utilizes a closed-loop cryogenic 'cold finger' to cool the Ti:S crystal to 33K, thus reducing the thermal lensing effect by nearly three orders of magnitude
Coherent has expanded its family of ultrafast laser products by introducing the Legend HE Cryo, a high-power titanium:sapphire (Ti:S) amplifier that delivers up to 7mJ/pulse with a pulse duration of less than 50femtoseconds.
This pulse energy is more than double that of earlier Legend amplifiers.
The Legend HE Cryo also sets new standards in terms of average power (up to 25Watts) and peak power (over 100GW).
Yet the beam quality and noise levels - (M2 <1.5) and pulse-to-pulse stability +/-1% - are similar to amplifiers with much lower power ratings.
The new amplifier can be operated at pulse repetition rates up to 7kHz.
In the past, the operating power of high-performance Ti:S amplifiers has been limited by increased thermal lensing in the Ti:S crystal.
The Legend HE Cryo utilizes a closed-loop cryogenic 'cold finger' to cool the Ti:S crystal to 33K, thus reducing the thermal lensing effect by nearly three orders of magnitude.
This allows the new Legend HE Cryo multi-pass amplifier to take full advantage of the 90 watts output power available from the latest Coherent Evolution pump lasers.
Applications for the Legend HE Cryo include particle injection for linear accelerators, high-energy plasma studies, and research in surface physics effects.
The high-power output is also useful for investigations of advanced materials processing techniques in micromachining and Mems fabrication.
