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International Congress on Applications of Lasers & Electro-Optics (ICALEO)

Progress in developing an ultra short wavelength solid state laser

M. M. S. Gualini

Published Oct 1, 2003• 0 citations
Publisher

Abstract

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.

DOI
10.2351/1.5060150

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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.
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.
The project is focused on theoretical and experimental studies of the quantum coherence effects at the atomic and nuclear transitions in solids. The main results are the following. 1. Electromagnetically Induced Transparency (EIT) and all-optical writing and probing of quantum coherence in room temperature solids are demonstrated experimentally in the first time. 2. The method for coherent suppression of excited state absorption in laser crystals is suggested. It opens the prospects for realization of the variety tunable solid state lasers including UV and VUV ranges. 3. High-efficient THz generation by means of resonant three-level mixing based on EIT in solids is predicted. 4. EIT in gamma-ray range of frequencies at the nuclear transitions via the nuclear level crossing is demonstrated experimentally in the first time. 5. Slowing of the gamma-ray photons due to the absorption line doublet is demonstrated in the first time. 6. Modifications of the Mossbauer absorption spectra under the action of laser radiation demonstrated experimentally in the first time. 7. The method for suppression of the inhomogeneous line broadening of the Mossbauer spectra is suggested.
Optically active defects suspended in an inert solid are an interesting system for sensing and magnetometry at the nanometer scale, in addition to being a potential source of high-density, identical quantum emitters for quantum information. Beyond their response to external fields, the optical absorption and emission spectra also reflect information about the host matrix, which is critical to understand for either application. For the particular system of thulium atoms implanted in solid argon, high resolution laser spectroscopy reveals narrow ensemble linewidths of the 1140 nm f to f ground state spin-orbit transition, which is split due to crystal field effects and hyperfine coupling. Pump-probe spectroscopy is used to identify crystal field levels in at least two stable trapping sites, and the crystal field is determined to be nearly axial in both sites. Strong selection rules indicate that this transition becomes magnetic-electric in the argon host, most likely due to dielectric effects. In the presence of mT magnetic fields, Zeeman shifts are resolvable by laser fluorescence, allowing crystal axis selective polarized spectroscopy. These results show that all-optical detection schemes for DC magnetic fields are already possible with thulium-doped argon, and point towards more informed strategies for monitoring and improving crystal growth and annealing.
A method of suppression of losses due to excited-state absorption (ESA) in laser crystals is proposed, based on the well-known phenomenon of electromagnetically induced transparency. Typical situations in which ESA prevents lasing are considered. Theoretical analysis shows that by using an additional driving laser field one can inhibit ESA and make lasing possible. On the basis of available spectroscopic information estimates for rare-earth-ion-doped laser materials are presented. They show the feasibility of obtaining optical gain at parity-allowed $4{f}^{n}\ensuremath{\leftrightarrow}4{f}^{n\ensuremath{-}1}5d$ transitions of rare-earth ions in the ultraviolet spectral region after suppression of ESA at an emission wavelength into the conduction band of a host material.