Nd concentration optimization for efficient low-cost 473-nm diode-pumped Nd:YAG/KNbO3 microchip assembly

Thierry Georges; Julien Rouvillain; Yohann Garin; Raymond Le Bras; Patrice Feron

doi:10.1117/12.529256

8 July 2004 Nd concentration optimization for efficient low-cost 473-nm diode-pumped Nd:YAG/KNbO3 microchip assembly

Thierry Georges, Julien Rouvillain, Yohann Garin, Raymond Le Bras, Patrice Feron

Proceedings Volume 5332, Solid State Lasers XIII: Technology and Devices; (2004) https://doi.org/10.1117/12.529256
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

Abstract

Although powerful (2.8 W) blue emission at 473 nm was recently reported, the design of low-cost compact and efficient 473 nm source failed so far. We have theoretically and experimentally analyzed the operation of a simple 2.1 mm long microchip assembly pumped by a 100x1 μm laser diode and found several ways to improve the efficiency of such a laser. As a first result, we achieved high beam quality (M²<1.2) 40 mW CW operation @ 473 nm with less than 900 mW launched power (5% efficiency) and small low-frequency (10Hz-20 kHz) noise. Multi-frequency operation however led to high-frequency noise (green problem). To our best knowledge, this is the highest efficiency obtained with a linear cavity. In this paper, we model and measure thermal lensing, pump, 946 nm and 473 nm beam size and power evolution within the MCA. Nd concentration was left unoptimized in previously reported experiments to its standard value (1.1%). Optimum Nd concentration is shown to generally be greater than 1% and is compatible with efficient low-noise single-frequency operation.

Citation Download Citation

Thierry Georges, Julien Rouvillain, Yohann Garin, Raymond Le Bras, and Patrice Feron "Nd concentration optimization for efficient low-cost 473-nm diode-pumped Nd:YAG/KNbO3 microchip assembly", Proc. SPIE 5332, Solid State Lasers XIII: Technology and Devices, (8 July 2004); https://doi.org/10.1117/12.529256

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KEYWORDS

Diodes

Neodymium

YAG lasers

Crystals

Absorption

Nd:YAG lasers

Polarization

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