研究目的
To optimize the spatial profile at the focal point of a high-energy femtosecond laser for high harmonic generation in gases by adding customized wavefront terms, thereby increasing the XUV pulse energy.
研究成果
The study demonstrates the feasibility of optimizing the off-focus beam spot in a high-energy laser system by adding spherical aberrations, achieving a tenfold enlargement of the beam spot area in the HHG gas medium. This method significantly increases the XUV pulse energy, with up to 5.6 μJ obtained from HHG in argon gas.
研究不足
The correction limit of the wavefront originates from the surrounding air flow and thermal drift in the laser amplifiers. The temporal profile of the laser pulse is affected by the spherical aberrations added in the wavefront, introducing a temporal broadening of up to 13.4 fs.
1：Experimental Design and Method Selection:
The study involves optimizing the spatial profile of a high-energy femtosecond laser beam for HHG by adding customized wavefront terms. The methodology includes wavefront correction using a deformable mirror and wavefront sensor.
2：Sample Selection and Data Sources:
The experiment uses a 500 mJ Ti: Sapphire laser beam interacting with argon gas in a gas cell for HHG.
3：List of Experimental Equipment and Materials:
A 25 TW femtosecond laser system, deformable mirror (ILAO Star serial, Imagine Optic), wavefront sensor (HASO3-First, Imagine Optic), argon gas cell, and XUV photodiode (AXUV100).
4：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser beam's wavefront is corrected using a deformable mirror and wavefront sensor. The corrected beam is then focused into an argon gas cell for HHG. The XUV output is measured using an XUV photodiode.
5：Data Analysis Methods:
The XUV pulse energy is measured and compared for different beam spot sizes and laser intensities to assess the optimization's effectiveness.
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