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Springer proceedings in physics

Bistability in Intracavity Resonant Degenerate 4-Wave Mixing in Na Vapor

Wulfhard K. Lange, E. Köster, J. Mlynek

Published Jan 1, 1986• 1 citation
Publisher
DOI
10.1007/978-3-642-46580-2_67

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Resonant degenerate 4-wave mixing (DFWM) has proven to be a powerful technique to generate phase conjugate (PC) wave fronts. In this contribution we consider the situation where the nonlinear medium is placed inside a Fabry-Perot cavity (Fig. 1). In this geometry, the intracavity pump intensity and, as a consequence, also the PC emission are expected to exhibit bistable switching /1,2/. With respect to practical applications, intracavity PC might be of interest, e.g., for probing an optical memory element or for Q-switching a resonator with a phase conjugating mirror. Only recently, however, first experimental studies on bistability in intracavity PC have been performed /3,4/.

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Raman Excited Spin Coherences for Turbulence Imaging

M. S. Shahriar, Shaoul Ezekiel

The objective of this project was to explore the feasibility of using Raman excited spin coherence for turbulence imaging. We experimentally demonstrated that it is possible to use degenerate four-wave mixing (DFWM) in Na vapor to correct intracavity high-speed turbulence aberrations. The use of sodium vapor as a phase conjugate mirror (PCM) provides gains greater than unity and an ideal response time of about 16 nsec, even with cw laser pump beams. We demonstrated a cw degenerate phase conjugate resonator (PCR) using Na vapor with a very low lasing threshold of 4.5 W/cm2 of pump intensity. This low power threshold is produced by DFWM based on coherent population trapping (CPT) in Na vapor when operating close to the Dl transition. The intracavity turbulence was created by a He jet from a nozzle that was driven at the nozzle's resonance of 18 kHz. In the intracavity turbulence correction experiment, a typical intensity for the forward and reverse DFWM pump beams is 10W/ cm2. This experiment provided a low-threshold PCR involving a double-A CPT interaction that produced a correction factor of 9.6 for the temporal aberrations caused by an 18 kHz intracavity turbulence with a flow rate of 250 m/s.

STIN•Apr 1, 1999•0 citations
Resonant degenerate 4-wave mixing (DFWM) has proven to be a powerful technique to generate phase conjugate (PC) wave fronts. In this contribution we consider the situation where the nonlinear medium is placed inside a Fabry-Perot cavity (Fig. 1). In this geometry, the intracavity pump intensity and, as a consequence, also the PC emission are expected to exhibit bistable switching /1,2/. With respect to practical applications, intracavity PC might be of interest, e.g., for probing an optical memory element or for Q-switching a resonator with a phase conjugating mirror. Only recently, however, first experimental studies on bistability in intracavity PC have been performed /3,4/.
The objective of this project was to explore the feasibility of using Raman excited spin coherence for turbulence imaging. We experimentally demonstrated that it is possible to use degenerate four-wave mixing (DFWM) in Na vapor to correct intracavity high-speed turbulence aberrations. The use of sodium vapor as a phase conjugate mirror (PCM) provides gains greater than unity and an ideal response time of about 16 nsec, even with cw laser pump beams. We demonstrated a cw degenerate phase conjugate resonator (PCR) using Na vapor with a very low lasing threshold of 4.5 W/cm2 of pump intensity. This low power threshold is produced by DFWM based on coherent population trapping (CPT) in Na vapor when operating close to the Dl transition. The intracavity turbulence was created by a He jet from a nozzle that was driven at the nozzle's resonance of 18 kHz. In the intracavity turbulence correction experiment, a typical intensity for the forward and reverse DFWM pump beams is 10W/ cm2. This experiment provided a low-threshold PCR involving a double-A CPT interaction that produced a correction factor of 9.6 for the temporal aberrations caused by an 18 kHz intracavity turbulence with a flow rate of 250 m/s.