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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 23 — Dec. 1, 2012
  • pp: 4886–4888

Wavefront measurement of single-mode quantum cascade laser beam for seed application in laser-produced plasma extreme ultraviolet system

Krzysztof M. Nowak, Takeshi Ohta, Takashi Suganuma, Toshio Yokotsuka, Junichi Fujimoto, and Hakaru Mizoguchi  »View Author Affiliations


Optics Letters, Vol. 37, Issue 23, pp. 4886-4888 (2012)
http://dx.doi.org/10.1364/OL.37.004886


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Abstract

Quantum cascade laser (QCL) is a very attractive seed source for a multikilowatt pulsed CO2 lasers applied for driving extreme ultraviolet emitting plasmas. In this Letter, we investigate output beam properties of a QCL designed to address P18 and P20 lines of 10.6 micron band of CO2 molecule. In particular, output beam quality and stability are investigated for the first time. A well-defined linear polarization and a single-mode operation enabled a use of phase retrieval method for full description of QCL output beam. A direct, multi-image numerical phase retrieval technique was developed and successfully applied to the measured intensity patterns of a QCL beam. Very good agreement between the measured and reconstructed beam profiles was observed at distances ranging from QCL aperture to infinity, proving a good understanding of the beam propagation. The results also confirm a high spatial coherence and high stability of the beam parameters, the features expected from an excellent seed source.

© 2012 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3470) Lasers and laser optics : Lasers, carbon dioxide
(140.4130) Lasers and laser optics : Molecular gas lasers
(140.3538) Lasers and laser optics : Lasers, pulsed
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 30, 2012
Revised Manuscript: October 14, 2012
Manuscript Accepted: October 17, 2012
Published: November 27, 2012

Citation
Krzysztof M. Nowak, Takeshi Ohta, Takashi Suganuma, Toshio Yokotsuka, Junichi Fujimoto, and Hakaru Mizoguchi, "Wavefront measurement of single-mode quantum cascade laser beam for seed application in laser-produced plasma extreme ultraviolet system," Opt. Lett. 37, 4886-4888 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-23-4886


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References

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