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The term that refers to the entire laser apparatus used in a healthcare facility is the "Healthcare laser system (HCLS)." This designation encompasses all components of the laser apparatus, including the power supply, control systems, delivery devices, and any ancillary equipment necessary for effective operation within a clinical setting. Understanding this terminology is essential for clear communication among healthcare professionals and for ensuring that all components are correctly integrated and functioning in a patient-safe manner.

The other terms listed may refer to parts or functions of laser systems but do not capture the comprehensive nature of the entire system utilized in healthcare. For instance, "laser processing unit" may imply a focus on specific processing capabilities rather than the entirety of the system. Similarly, "laser application system" typically denotes the part of the system that applies the laser energies, while "clinical laser device" might refer to just the laser itself, rather than the complete apparatus including operational components and safety features. Therefore, the comprehensive designation of "Healthcare laser system (HCLS)" accurately reflects the complete apparatus used in clinical settings, ensuring clarity in both operational and regulatory contexts.