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Optics Letters

Tunable deep-ultraviolet source generated by scattering off adiabatically prepared Raman coherence in hydrogen gas

Wei-Jan Chen, A. H. Kung

Published Oct 1, 2005• 5 citations
Publisher

Abstract

We demonstrate a tunable deep-ultraviolet coherent source generated by the beating of a tunable UV laser and strongly driven vibrational Raman coherence in hydrogen. The total energy conversion efficiency reaches a maximum of 50% at the phase side of the Raman coherence. The generated spectrum of Raman sidebands tunes with the input and extends from 435 to 146 nm for an input at 282 nm.

DOI
10.1364/ol.30.002608

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Summary form only given. There has been increasing interest in optical processes using strong-coupling and induced transparency, termed electromagnetically induced transparency (EIT). Although the idea of EIT started for resonant /spl and/h-scheme (Raman scheme), the idea has now been extended to far-off resonance Raman system. We have reported the spontaneous evolution of strong-coupling through stimulated Raman scattering (SRS) using solid hydrogen. In the present work, we extend the strong-coupling SRS to a more general parametric Raman sideband generation. We show using solid hydrogen as a test medium that, in tile far-off resonance Raman scheme, the strongly-coupled Raman coherence can beat with very broad-band laser radiation and can efficiently copy the broadband nature to Raman sidebands without restriction of the phase-matching, and that this efficient copying occurs on the negative Raman detuning for which the strongly-coupled eigenstate evolves to the anti-phased state (dark state).

Quantum Electronics and Laser Science Conference•May 7, 2000•0 citations
We demonstrate a tunable deep-ultraviolet coherent source generated by the beating of a tunable UV laser and strongly driven vibrational Raman coherence in hydrogen. The total energy conversion efficiency reaches a maximum of 50% at the phase side of the Raman coherence. The generated spectrum of Raman sidebands tunes with the input and extends from 435 to 146 nm for an input at 282 nm.
Parametric Raman sideband generation is investigated using strongly driven Raman coherence in solid hydrogen. We show that the Raman coherence prepared with two coaxial single-mode lasers beats with multimode laser radiation with very broad bandwidth and efficiently replicates the broadband nature to the Raman sidebands without the restriction of phase matching. We demonstrate that this efficient replication occurs mainly on the negative side of Raman detuning, where the medium adiabatically follows the antiphased state.
We investigated the Raman coherence characteristics in the solid hydrogen film deposited on a sapphire substrate. By using Raman coherence prepared with two single-frequency pulsed lasers, we generated the multiorder coherent Raman sidebands in solid hydrogen film. High-order Raman sidebands were obtained under strong pumping conditions (≥230 MW/cm2). The generated anti-Stokes(AS)–Raman sidebands extended from ultraviolet (292 nm for AS5 band) to visible (565 nm for AS1 band) region. The multiorder Raman sideband generation is thought to be due to the parametric coupling of pump and coupling lasers. The frequency conversion efficiency shows the maximum (14%) at the pumping intensity of 360 MW/cm2. From the experiment that makes the multimode probe beam beat with the prepared Raman coherence, we found that the prepared Raman coherence replicates the probe beam to its Raman sidebands.
The solid para-hydrogen film was prepared by depositing the para-hydrogen vapor onto a sapphire substrate. From the stimulated Raman scattering experiment using two ns-lasers whose laser-frequency difference is equal to the fundamental vibrational transition of the solid para-hydrogen, we observed the collinear generation of Raman sidebands. The high-order Raman sidebands were obtained under the strong pumping intensity (≥230 MW/cm 2 ). The generated five anti-Stokes(AS)-Raman sidebands extend from ultraviolet (292 nm for AS 5 band) to visible (565 nm for AS 1 band) region. Also, we found that the first AS-Raman signal shows weak rotational components as well as a strong vibrational line. From the experiment that makes the multimode probe beam beat with the prepared Raman coherence, we found that the prepared Raman coherence replicates the probe beam to its Raman sidebands. The frequency conversion efficiency from the probe beam to the first AS-Raman sideband rises to the maximum (4.7%) at 284 MW/cm 2 , and then falls with the increase of the pumping intensity. This is thought to be due to the fact that some molecules in the first vibrational level incline to go to the higher vibrational level under the higher pumping intensity. For the strong pumping intensity (290 MW/cm 2 ), four anti-Stokes and one Stokes Raman sidebands of the probe beam were generated.
Abstract We report generation of spectrally bright vacuum ultraviolet (VUV) and deep UV (DUV) coherent radiations at the wavelengths of 192 nm, 198 nm and 204 nm. These DUV/VUV radiations originate from resonant four-wave mixing assisted by quantum coherence in tunnel-ionized CO molecules. The electronic coherence is created when the pump pulses resonantly excite electronic transitions of CO+. The technique allows for the selective switch of DUV/VUV wavelengths provided by the abundant energy levels of molecular ions. The developed source can have arbitrary polarization states by manipulating the polarization of the pump pulse. It also exhibits a spectral bandwidth of 5∼7 cm−1, a divergence angle of 3∼5 mrad, a pulse duration of ∼10 ps, and a photon flux of ∼1010 photons/s. The superior temporal and spectral properties give rise to a broadband Raman comb in the DUV/VUV region.
Summary form only given. There has been increasing interest in optical processes using strong-coupling and induced transparency, termed electromagnetically induced transparency (EIT). Although the idea of EIT started for resonant /spl and/h-scheme (Raman scheme), the idea has now been extended to far-off resonance Raman system. We have reported the spontaneous evolution of strong-coupling through stimulated Raman scattering (SRS) using solid hydrogen. In the present work, we extend the strong-coupling SRS to a more general parametric Raman sideband generation. We show using solid hydrogen as a test medium that, in tile far-off resonance Raman scheme, the strongly-coupled Raman coherence can beat with very broad-band laser radiation and can efficiently copy the broadband nature to Raman sidebands without restriction of the phase-matching, and that this efficient copying occurs on the negative Raman detuning for which the strongly-coupled eigenstate evolves to the anti-phased state (dark state).