Spectral Beam Combining in Diode Laser Systems
Summary
Spectral beam combining (SBC) merges outputs from multiple diode emitters, each operating at a distinct wavelength, into a single high-brightness beam. By dispersing and recombining these wavelength-offset beams through elements such as gratings, thin-film filters or volume Bragg gratings, SBC preserves the individual beam quality while scaling total output power. Recent developments have addressed challenges in wavelength stabilisation, channel spacing minimisation and thermal management, enabling systems to reach kilowatt-level outputs with near-diffraction-limited beam parameters. Applications span industrial materials processing, directed energy, scientific instrumentation and medical therapies, where high brightness and efficiency are paramount. Contemporary research focuses on optimising multiplexing architectures—coarse and dense spectral schemes—innovating external-cavity designs and integrating advanced spectral locking mechanisms to enhance stability, efficiency and scalability.
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Spectral Beam Combining in Diode Laser Systems publication trend
The graph below shows the total number of articles in spectral beam combining in diode laser systems across all publications each year (not limited to Nature Index journals).
Technical terms
Spectral beam combining: A technique that overlaps beams of different wavelengths from multiple laser emitters to form a single high-brightness beam.
Volume Bragg grating (VBG): A holographic element that reflects or transmits narrow spectral bands, used for wavelength stabilisation and multiplexing.
Thin-film filter: A dielectric coating that disperses light spectrally to separate or recombine specific wavelength channels.
Beam parameter product (M²): A figure of merit quantifying beam quality, where lower values indicate closer to the diffraction limit.
Spectral channel spacing: The difference in centre wavelengths between adjacent emitters in a spectral beam combining system.
References
- High beam quality, high brightness dense spectral beam combining of 650 nm laser diode module.. Optics Express (2024).
- kW-class fiber-coupled diode laser source based on dense spectral multiplexing of an ultra-narrow channel spacing.. Optics Express (2018).
- Thin-film filter wavelength-stabilized, grating combined, high-brightness kW-class direct diode laser.. Optics Express (2017).
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