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Quantum Beam Science
We discuss requirements on relativistic-irradiance (I 0 > 10 18 W/cm 2 ) high-power (multi-terawatt) ultrashort (femtosecond) lasers for efficient generation of high-order harmonics in gas jet targets in a new regime discovered recently . Here, we present the results of several experimental campaigns performed with different irradiances, analyse the obtained results and derive the required laser parameters. In particular, we found that the root mean square (RMS) wavefront error should bedoi:10.3390/qubs2010007 fatcat:hajlbeamq5dt7iyjpo3wbchagy