Analysis of multiwavelength coherent beam combining effect

Area of Science:

• Optics
• Laser Physics
• Photonics

Background:

• Coherent beam combination (CBC) enhances laser power and brightness.
• Multiwavelength CBC offers advantages in spectral diversity and system flexibility.
• Understanding performance limitations is key for practical applications.

Purpose of the Study:

• To theoretically investigate the combination effect in multiwavelength active coherent beam combination (CBC).
• To analyze the influence of optical path control precision, spectral width, and wavelength/channel numbers on CBC performance.
• To provide insights for designing and estimating the performance of multiwavelength CBC systems.

Main Methods:

• Theoretical analysis of multiwavelength active coherent beam combination.
• Mathematical modeling of the dependence of combination effect on system parameters.
• Investigation of performance variations under different optical path variance conditions.

Main Results:

• Combination effect degrades quadratically with increasing wavelength number, spectral width, and optical path variance for small variances.
• For large optical path variances, the combination effect becomes independent of variance and spectral width.
• Increased wavelength number reduces Strehl ratio, potentially leading to incoherent combination.

Conclusions:

• Optical path control precision is essential for effective multiwavelength CBC.
• The study highlights the trade-offs between system complexity and performance in multiwavelength CBC.
• Findings are valuable for optimizing multiwavelength CBC system design and performance prediction.