✍ Scribed by M Brunken; L Casper; H Genz; C Hessler; S Khodyachykh; A Richter
No coin nor oath required. For personal study only.
A compact autocorrelator suitable for the measurement of the optical pulse length of the infrared free electron laser (IR-FEL) at the S-DALINAC is described. It allows to investigate the energy transfer process from the electrons into the laser light within the undulator of the FEL. The autocorrelator utilizes the second harmonic generation (SHG) and it provides the possibility of a background-free measurement at wavelengths between 4 and 10 m. Simulations for three di erent crystals used for SHG show that the largest e ciency for SHG and the best temporal resolution is achieved with a ZnGeP2 crystal at a length of 2 mm. A test experiment at the free electron laser for infrared experiments conÿrmed the expected high e ciency of about 7.5% of SHG for the ZnGeP2 crystal as well as the easy handling and fast adjustment of the system.
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