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26 April 2019 Temporal pre-pulse generation in high-intensity CPA lasers from imperfect domain orientation in anisotropic crystals
Josef Cupal, Thomas Spinka, Emily Sistrunk, Bedrich Rus, Constantin Haefner
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Proceedings Volume 11034, Short-pulse High-energy Lasers and Ultrafast Optical Technologies; 110340F (2019) https://doi.org/10.1117/12.2524115
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic
Abstract
We present a study of the temporal pre-pulse contrast degradation of high focused intensity pulses produced in CPA laser systems due to imperfections in amplifier design, alignment of amplifier components, and crystal inhomogenity. Using a measurement technique we have developed, we demonstrate the presence of multiple crystal domains inside Ti:sapphire slabs with ≈10 cm diameter. The results of our numeric calculations show that crystalline c-axis orientation inhomogenity caused by these crystal domains can lead to generation of pre-pulses with relative contrast >10-10 within several picoseconds before the main pulse. In a multiple-slab amplifier head configuration sometimes used in high repetition rate systems, the misalignment of the amplifier slabs crystalline c-axes with respect to each other can lead to the generation of pre-pulses with relative contrast as high as 10-6, depending on the magnitude of misalignment.
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Josef Cupal, Thomas Spinka, Emily Sistrunk, Bedrich Rus, and Constantin Haefner "Temporal pre-pulse generation in high-intensity CPA lasers from imperfect domain orientation in anisotropic crystals", Proc. SPIE 11034, Short-pulse High-energy Lasers and Ultrafast Optical Technologies, 110340F (26 April 2019); https://doi.org/10.1117/12.2524115
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KEYWORDS
Crystals
Amplifiers
Polarization
Optical amplifiers
Laser crystals
Laser systems engineering
Pulsed laser operation
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