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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Advancement in very-short-wavelength emission in solid state lasers

M. M. S. Gualini

Published Feb 19, 2002• 0 citations
Publisher

Abstract

Solid state lasers emitting at very short wavelengths (>10nm) are very attractive for several applications in material proce3ssing and holography, but not yet demonstrated. Physical limitations prevent using classic laser schemes. We present a semi-empirical and rigorous demonstration of the feasability of a solid state x-ray laser and find some relations of the suggested scheme with EIT (Electro-Magnetic Induced Transparency) and Lasing Without Inversion (LWI).

DOI
10.1117/12.456863

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Solid state lasers emitting at very short wavelengths (>10nm) are very attractive for several applications in material proce3ssing and holography, but not yet demonstrated. Physical limitations prevent using classic laser schemes. We present a semi-empirical and rigorous demonstration of the feasability of a solid state x-ray laser and find some relations of the suggested scheme with EIT (Electro-Magnetic Induced Transparency) and Lasing Without Inversion (LWI).
Laser emission in the ultra short wavelength region from solid-state crystals may be possible as demonstrated through a rigorous quantum optic method. It appears that Zeeman’s effect in a deformed crystal lattice has a determinant role in contributing to the conditions of gain enhancement. We found the same conditions of gain enhancement assuming the crystal in Electromagnetic Transparency (EIT) conditions. It has been already demonstrated that Lasing Without Inversion (LWI) can be obtained at EIT conditions. The paper revises the above demonstrations and discusses the possibility of realizing a solid-state laser emitting in the ultra short wavelength region.
We demonstrated through a rigorous quantum optic method the possibility to obtain extremely short wavelengths in solid-state deformed crystals hinting that the Zeeman’s effect in a crystal lattice has an essential role in contributing to the conditions of gain enhancement. We found the same conditions of gain enhancement assuming the crystal in Electro Magnetic Transparency (EIT) conditions thus suggesting that Zeeman’s effect in crystals and EIT are somehow linked together. The paper presents the first attempt to relate the crystal deformation parameters to the Rabi’s frequencies, thus confirming rigorously the link between Zeeman’s effect and EIT.
Summary form only given. Intensive theoretical work, carried out in the past decade, has indicated that optical properties of matter can be dramatically affected by atomic coherence and interference effects. In particular, atomic coherence and interference was shown to lead to such intriguing phenomena as electromagnetically induced transparency, lasing without population inversion (LWI), and resonant enhancement of refractive index accompanied by vanishing absorption. In the present paper we report the first experimental observation of LWI oscillation and the first demonstration of index enhancement.
This review paper is devoted to amplification and lasing without population inversion involving atomic transitions in gas media. We start by discussing the main motivation in inversionless lasing research, namely, the generation of short-wavelength laser light. Then, we review the basic physics of inversionless lasing in two-level and, eventually, in three- and multilevel atomic configurations. Finally, we summarize the current state of the art of LWI experiments and indicate the main difficulties with respect to short-wavelength laser generation.