The collection of light emitted from a plasma or other volumetric light source is often collected using an optical collimator coupled to an optical fibre. In this work the spatial dependence of transmission from a light source into a fibre via a variety of collimating lens systems is investigated using a table top optical setup and a full 3D ray tracing simulation. The solid angle emitted from a point source that is accepted into the fibre is found to depend in a complex and unintuitive manner on the spatial position of the source relative to the optical system. Back-illumination is often used to focus the optical system such that it produces a well defined beam, which is then assumed as a ‘line of sight’. However even in these cases there are non-monotonic behaviours within this ‘line of sight’ that mean the often-made assumption of a single acceptance angle or cone of observation is not valid in these systems. This has significant implications for the application of these opti...

中文翻译：

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用于等离子体发射观测的光纤耦合准直光学器件的不直观行为

通常使用耦合到光纤的光学准直仪来收集从等离子体或其他体积光源发出的光的收集。在这项工作中，使用台式光学装置和完整的3D光线追踪模拟研究了从光源通过各种准直透镜系统传输到光纤的空间依赖性。发现从点光源发出的被接收到光纤中的立体角以复杂且不直观的方式取决于光源相对于光学系统的空间位置。背照明通常用于使光学系统聚焦，从而产生清晰的光束，然后将其视为“视线”。但是，即使在这些情况下，在此“视线”内仍存在非单调行为，这意味着通常对单个接受角或视锥的假设在这些系统中无效。这对于这些优化器的应用具有重大意义。