Temperature effects on the operation and input/output wavelengths of a high-power fiber-coupled diode end pumped Nd:YVO4 laser

Ashraf F. El-Sherif

doi:10.1117/12.901947

15 February 2012 Temperature effects on the operation and input/output wavelengths of a high-power fiber-coupled diode end pumped Nd:YVO₄ laser

Ashraf F. El-Sherif

Author Affiliations +

Proceedings Volume 8235, Solid State Lasers XXI: Technology and Devices; 82351O (2012) https://doi.org/10.1117/12.901947
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

A complete electrical and optical characterization for the high power diode laser module operating at 808 nm was performed. The laser diode operating at room temperature 25^oC gave a higher slope efficiency with low consumption electrical power and low threshold current lasing of 1.3 A. Maximum slope efficiency of 42% with a final electrical to optical conversion efficiency of 28% at 807.96 nm central wavelength with line width of 3.59 nm at FWHM was investigated. The emitted laser wavelength was measured and is affected by the temperature increasing; the diode peak wavelength was shifted by 0.35nm/^oC. Moreover, the appropriate wavelength for pumping Nd³⁺ doped materials (around 808nm) was obtained at the temperature range of (20-25^oC). Typical 808nm diode laser output was obtained with different driving input current at constant temperature of 25^oC. To illustrate the effect of changing diode temperature on the DEPSS output laser wavelength, the diode operating temperature must varied to be (12, 25, and 36^oC) and consequently, the pumping central wavelength will be changed, we presented that the output DEPSS (Nd:YVO₄) wavelength does not change because the broad band absorbance property for the Nd:YVO₄ crystals. DEPSS (Nd:YVO₄) laser system was implemented, and its optical characteristics were measured. Stable wavelength of 1066.08nm with a linewidth of 1.48nm at FWHM at different diode pumped powers (1, 1.4, and 1.75 Watt) and at constant temperature of 25^oC was measured. With diode pumping power of 6.6W, the output power was 3.273W with an output coupler reflectivity of 90%. The Fundamental mode (TEM₀₀) was examined, and the measured DEPSS divergence angle was 11±0.5 milliradian.

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Ashraf F. El-Sherif "Temperature effects on the operation and input/output wavelengths of a high-power fiber-coupled diode end pumped Nd:YVO₄ laser", Proc. SPIE 8235, Solid State Lasers XXI: Technology and Devices, 82351O (15 February 2012); https://doi.org/10.1117/12.901947

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KEYWORDS

Semiconductor lasers

Diodes

Temperature metrology

Neodymium lasers

Solid state lasers

Spectroscopy

Laser damage threshold

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