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Proceedings Paper

Wavelength locking of single emitters and multi-emitter modules: simulation and experiments
Author(s): Dan Yanson; Noam Rappaport; Ophir Peleg; Yuri Berk; Nir Dahan; Genady Klumel; Ilya Baskin; Moshe Levy
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Paper Abstract

Wavelength-stabilized high-brightness single emitters are commonly used in fiber-coupled laser diode modules for pumping Yb-doped lasers at 976 nm, and Nd-doped ones at 808 nm. We investigate the spectral behavior of single emitters under wavelength-selective feedback from a volume Bragg (or hologram) grating (VBG) in a multi-emitter module.

By integrating a full VBG model as a multi-layer thin film structure with commercial raytracing software, we simulated wavelength locking conditions as a function of beam divergence and angular alignment tolerances. Good correlation between the simulated VBG feedback strength and experimentally measured locking ranges, in both VBG misalignment angle and laser temperature, is demonstrated.

The challenges of assembling multi-emitter modules based on beam-stacked optical architectures are specifically addressed, where the wavelength locking conditions must be achieved simultaneously with high fiber coupling efficiency for each emitter in the module. It is shown that angular misorientation between fast and slow-axis collimating optics can have a dramatic effect on the spectral and power performance of the module.

We report the development of our NEON-S wavelength-stabilized fiber laser pump module, which uses a VBG to provide wavelength-selective optical feedback in the collimated portion of the beam. Powered by our purpose-developed high-brightness single emitters, the module delivers 47 W output at 11 A from an 0.15 NA fiber and a 0.3 nm linewidth at 976 nm. Preliminary wavelength-locking results at 808 nm are also presented.

Paper Details

Date Published: 4 March 2016
PDF: 10 pages
Proc. SPIE 9733, High-Power Diode Laser Technology and Applications XIV, 97330J (4 March 2016); doi: 10.1117/12.2212373
Show Author Affiliations
Dan Yanson, SCD SemiConductor Devices (Israel)
Noam Rappaport, SCD SemiConductor Devices (Israel)
Ophir Peleg, SCD SemiConductor Devices (Israel)
Yuri Berk, SCD SemiConductor Devices (Israel)
Nir Dahan, SCD SemiConductor Devices (Israel)
Genady Klumel, SCD SemiConductor Devices (Israel)
Ilya Baskin, SCD SemiConductor Devices (Israel)
Moshe Levy, SCD SemiConductor Devices (Israel)

Published in SPIE Proceedings Vol. 9733:
High-Power Diode Laser Technology and Applications XIV
Mark S. Zediker, Editor(s)

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