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Efficient monochromator to isolate VUV light generated by four-wave mixing techniques.

W A Vondrasek, S Okajima, J P Hessler

|June 12, 2010

Summary

Lateral chromatic aberration in a Lithium Fluoride (LiF) lens effectively isolates vacuum ultraviolet (VUV) light. This method minimizes intense pump light, enabling efficient VUV light detection.

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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

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Area of Science:

Optics and Photonics
Ultrafast Spectroscopy
Nonlinear Optics

Background:

Isolating vacuum ultraviolet (VUV) light from strong pump sources is crucial for VUV spectroscopy.
Four-wave mixing (FWM) is a common technique for VUV generation, but efficient separation of VUV from pump light is challenging.

Purpose of the Study:

To demonstrate a novel method for isolating VUV light generated via FWM.
To utilize the lateral chromatic aberration of an off-axis Lithium Fluoride (LiF) lens for VUV light separation.

Main Methods:

Positioning a LiF lens off-axis relative to incident light beams.
Exploiting the lens's lateral chromatic aberration to spatially separate VUV light from pump light.
Employing a single monochromator with interchangeable lenses for focused or collimated pump beams.

Main Results:

Successful isolation of VUV light from intense pump light using the off-axis LiF lens.
Achieved a high transmission ratio for the VUV light, with transmitted-to-incident pump energy at 3.3 x 10^-6.
Demonstrated the versatility of the monochromator for both tightly focused and collimated pump beam configurations.

Conclusions:

Lateral chromatic aberration of an off-axis LiF lens provides an effective means for VUV light isolation.
The described monochromator design offers a simple and efficient solution for VUV spectroscopy applications.
This technique enhances the signal-to-noise ratio in experiments involving VUV light generation via FWM.