Download Coherent Laser Beam Combining by Arnaud Brignon PDF
By Arnaud Brignon
Laser beam combining ideas enable expanding the facility of lasers a ways past what it truly is attainable to acquire from a unmarried traditional laser.One step additional, coherent beam combining (CBC) additionally is helping to take care of the very exact homes of the laser emission with recognize to its spectral and spatial houses. Such lasers are of significant curiosity for plenty of functions, together with commercial, environmental, protection, and
scientific functions. lately, major growth has beenmade in coherent beam combining lasers, with a complete output energy of a hundred kW already completed. Scaling
analysis exhibits that additional bring up of output strength with very good beam caliber is possible through the use of latest cutting-edge lasers. therefore, the data of coherent beam combining ideas turns into an important for the layout of next-generation highpower lasers. the aim of this ebook is to give the newer strategies of coherent beam combining by way of global chief groups within the field.
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Extra info for Coherent Laser Beam Combining
These laser technologies are particularly well suited toward the demands of 100 kW level CBC owing to their scalability, high gain, high efﬁciency, and outstanding spatial and temporal coherence properties. 2 Coherent Beam Combining System Requirements The primary requirement for high-efﬁciency CBC is that the combined beams must be mutually coherent in both space and time to allow complete constructive interference. This means the lasers must be spatially mode-matched and coaligned, power-balanced, copolarized, path length matched, and locked in phase with high precision.
Misalignments, the DOE combiner efﬁciency is then equal to its efﬁciency as a splitter gsplit. A more typical case is when the DOE is used to combine nominally equal power beams, such as generated from an array of identical lasers. 3. It is notable that even with 20% RMS power split imbalances between channels, Eq. 4). This is a testament to the well-known insensitivity of CBC to power imbalance among channels [8,11]. 3 DOE Thermal and Spectral Sensitivity Since angular dispersion is related to the groove density, the large DOE period results in greatly reduced sensitivity of DOE combiners to thermal distortions or to the input laser linewidths.
Time-dependent phase changes can be imposed by thermal, acoustic, gain, or nonlinear dynamics in each ampliﬁer. Low-frequency phase changes that fall within the servo bandwidth of the phase control system (typically <1–10 kHz) can be corrected with high ﬁdelity and do not impact CBC. 1 rad RMS) to avoid impacting CBC efﬁciency. Polarization. The ampliﬁer outputs must be copolarized to interfere constructively. Birefringence imposed by the ampliﬁers must either be kept to small levels or actively compensated.