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Single frequency, high power, tapered diode laser using phase-conjugated feedback

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Abstract

We demonstrate up to 1.6 Watts of single frequency output from a tapered diode laser operating at 785 nm. The tapered diode laser is used in a rear end external cavity set-up where the external feedback element is a combination of a BaTiO3 phase-conjugating crystal and a high reflection mirror. The set-up presented inherently suppresses the self-wavelength scanning effect, which is well known when employing a phase-conjugating crystal as a dynamic wavelength selection component in a laser cavity. The experimental results have been discussed theoretically in some details by employing a two-beam coupling model.

©2005 Optical Society of America

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Figures (6)

Fig. 1.
Fig. 1. Schematic of the optical set-up with the tapered laser diode.
Fig. 2.
Fig. 2. The slope-efficiency of the diode laser set-up with and without the phase-conjugating crystal.
Fig. 3.
Fig. 3. Spectrum of the optical output from the 785 nm diode laser set-up with the combined phase-conjugating crystal/mirror external cavity feedback.
Fig. 4.
Fig. 4. Drift of the laser wavelength as function of time. No self-scanning is observed.
Fig. 5.
Fig. 5. Definition of the normalized crystal thickness.
Fig. 6.
Fig. 6. The normalized intensities as found from the computer calculations.

Equations (2)

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d I 1 d z = α n I 1 2 Γ n I 1 I 2 I 1 + I 2
d I 2 d z = + α n I 2 2 Γ n I 1 I 2 I 1 + I 2 ,
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