Mr. Nir Feldman Profile

Nir Feldman

at SCD SemiConductor Devices

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Proceedings Article | 7 February 2007 Paper

Highly efficient and reliable 1 kW QCW laser stacks with diffraction limited fast axis beam collimation

Nir Feldman, Yoram Karni, Yuri Berk, Yaakov Gridish, Genadi Klumel, Moshe Levy, Shlomo Risemberg

Proceedings Volume 6456, 64561C (2007) https://doi.org/10.1117/12.700301

KEYWORDS: Collimation, Semiconductor lasers, Lenses, Laser development, High power lasers, Diffraction, Electro optics, Manufacturing, Reliability, Humidity

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808 nm, QCW laser bars delivering peak power higher than 150 Watts were developed. The optimization of the tensile strain in the QW structure, the design configuration of the laser cavity together with an improved packaging technology lead to more than 55% wall plug efficiency when assembled as stacks. Due to the high characteristic temperature (T₀, T₁) values and high efficiency, the output power of these devices is almost insensitive to elevated heat sink temperatures. In addition, a collimation technique which significantly improves the beam quality of the laser stacks was developed. The active collimation method is flexible and control over the level of collimation is achievable. The use of this collimation technique alongside with high quality micro lenses allows for a reduction of the fast axis divergence to values as low as 3 mrad with minimal power losses. An automatic process control was developed allowing for the efficient attachment of the collimating micro lenses in a highly reproducible fashion. The combination of the collimation technique with a reliable mounting and stacking technology supports the serial manufacturing of devices delivering 1 kW peak power in QCW operation. These QCW collimated diode laser stacks demonstrate stable operation and high reliability in the course of more than 6*10⁸shots at 2% duty cycle. Another important advantage of the collimated stacks is their capability to withstand severe environmental conditions, maintaining high beam quality and performance.

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