期刊
APPLIED PHYSICS LETTERS
卷 114, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5091587
关键词
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资金
- JSPS Strategic Fund for Strengthening Leading-Edge Research and Development, JSPS KAKENHI [JP15J08622, JP15H02041, JP15H05696]
- SENTAN program
- Center of Innovation Program from Japan Science and Technology Agency
We demonstrate broadband focusing of multiple high-order harmonics of intense femtosecond laser pulses using an ellipsoidal mirror. The ellipsoidal mirror, with a high numerical aperture and a highly accurate surface, was fabricated using a replication process. The multiple high-order harmonics in the wavelength range between 10 and 20nm were focused to the nearly diffraction-limited size of 350x380nm(2). According to Rayleigh's quarter wavelength criteria, the wavefront aberration of the focused beam was estimated to be less than 5nm, which corresponds to a temporal dispersion of 16 as. The developed focusing system is suited for producing an intense attosecond laser field with negligible wavefront aberration, with which nonlinear light-matter interactions in the attosecond time domain can be explored.
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