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High-Power Damage-Resistant XUV Bandpass Filter

Technology Benefits

Transmits XUV beams in a broad energy range High damage threshold Endures IR pump energy up to hundreds of mJ Low-cost and simple to implement

Technology Application

Medical diagnostics XUV lithography Radiography

Detailed Technology Description

HHG generated pulses in the XUV and SXR spectral ranges, from several eV to keV energies, pass through the MCP filter while IR and NIR wavelengths are reflected, allowing for rejection of up to hundreds of mJΓÇÖs of pump light, an amount unmatched by any other technique. The filtering works analogous to that of a microwave door, where the wavelengths smaller than the dimensions of the periodic structure can propagate through, while those larger become evanescent and reflect off the structure. The MCP is fabricated from a resistive material, such as glass, with a dense array of parallel microchannels (typically 5-25 micrometers in diameter) leading from one surface to the other. Since this XUV filter blocks infrared pump source light, it is especially useful for next-generation mid-infrared pump lasers, the future for generating even shorter attosecond pulses.

*Abstract

UCF researchers have developed an advanced optical filtering method with a very high damage threshold to separate XUV wavelengths greater than 200 eV from the pump laser pulse often containing tens or hundreds of millijoules (mJ) of energy per pulse. Compared to conventional methods, this technique is easier to implement and can be used for HHG ultra-broadband XUV generation, isolated attosecond pulse generation, and high flux attosecond SXR generation based on HHG. With easy installation and a high damage threshold, the filter offers significant advantages over fragile thin metal foil filters, which have been unable to withstand high-intensity pump light and vibration. This new filter can greatly improve commercial HHG-based XUV sources for applications such as medical diagnostics, XUV lithography, and radiography of shielded structures by significantly improving the XUV pulse to pump signal ratio.

*Principal Investigator

Name: Zenghu Chang, Ph.D.

Department:

Name: Qi Zhang

Department:

Name: Kun Zhao, Ph.D.

Department:

Country/Region

USA