Hysteresis loop and pattern from the dual-wavelength competition in an Nd:YVO4 laser with an intracavity periodically poled lithium niobate Bragg modulator

Kun-Guei Hong; Shou-Tai Lin; Ming-Dar Wei

doi:10.1117/12.2061496

25 September 2014 Hysteresis loop and pattern from the dual-wavelength competition in an Nd:YVO₄ laser with an intracavity periodically poled lithium niobate Bragg modulator

Kun-Guei Hong, Shou-Tai Lin, Ming-Dar Wei

Author Affiliations +

Proceedings Volume 9194, Laser Beam Shaping XV; 919413 (2014) https://doi.org/10.1117/12.2061496
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

This study demonstrates hysteresis loop and pattern formation in a Nd:YVO4 laser at 1064nm (⁴F_3/2 →4I1 _1/2) and 1342nm (⁴F_3/2→⁴I_13/2) with an intracavity electro-optic periodically poled lithium niobate (EO PPLN) Bragg modulator by using a T-type cavity configuration. Based on these dual wavelengths sharing population inversion in the same upper energy level to lase, the transmission, Tp, of EO PPLN was chosen as the controlling parameter to explore the dynamics of dualwavelength competition. A hysteresis loop occurred when the extracting efficiencies of dual wavelength were near equivalent. When the pump power was 9.0 W, the hysteresis loop was observed in the region of the transmission of PPLN between Tp=64.88% to Tp=84.47%. The slope efficiencies were 25.96 and 3.92% and the thresholds were 2.5 and 3.5 W for the wavelengths of 1064 and 1342 nm, respectively. The width of the hysteresis loop increased when the pump power increased. Moreover, the hysteresis loop accompanied with the variation of the pattern formation. A high-order transvers mode was easily observed at 1342 nm light, but a simple spot existed for 1064 nm light. Apparently, the role of gain competition is worthy to deeply explore.

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Kun-Guei Hong, Shou-Tai Lin, and Ming-Dar Wei "Hysteresis loop and pattern from the dual-wavelength competition in an Nd:YVO₄ laser with an intracavity periodically poled lithium niobate Bragg modulator", Proc. SPIE 9194, Laser Beam Shaping XV, 919413 (25 September 2014); https://doi.org/10.1117/12.2061496

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KEYWORDS

Polarization

Neodymium lasers

Modulators

Coating

Lithium niobate

Crystals

Fiber Bragg gratings

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