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Out-coupling grating for XUV frequency combs in the short wavelength region
Optics Express
|June 14, 2025
Summary
Researchers developed a novel grating design to improve extreme ultraviolet (XUV) optical frequency combs. This new design enhances XUV out-coupling efficiency near 50 nm for precision spectroscopy.
Area of Science:
- Quantum Optics
- Spectroscopy
- Ultrafast Science
Background:
- Extreme ultraviolet (XUV) optical frequency combs are essential for precision spectroscopy and ultrafast science.
- Grating-type output couplers are crucial for manipulating XUV radiation in comb setups, reflecting infrared beams and out-coupling XUV.
- Existing designs face limitations in out-coupling efficiency, particularly in the short-wavelength region.
Purpose of the Study:
- To propose and demonstrate a new grating design for enhanced XUV out-coupling efficiency.
- To improve the performance of XUV optical frequency combs in the short-wavelength region (near 50 nm).
- To facilitate advanced precision measurements using XUV combs.
Main Methods:
- Theoretical simulation of a novel grating design.
- Fabrication of the proposed grating based on simulations.
- Experimental testing of the fabricated grating within a femtosecond enhancement cavity.
Main Results:
- Achieved a buildup factor of 77 and an intra-cavity power of 2.4 kW.
- Observed high-order harmonics up to the 17th order.
- Demonstrated higher out-coupling efficiency around 50 nm compared to previous designs.
Conclusions:
- The new grating design offers an improved scheme for XUV comb performance in the short-wavelength region.
- This advancement benefits precision measurements, including frequency measurements of He+ (61 nm) and Li+ (41 nm) transitions.
- Provides a valuable alternative for enhancing XUV comb capabilities.
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