Lambda 421光束合成系统光束组合器

Lambda 421光束组合器是一种新的概念，用于将具有不同光谱的独立光源组合成一个单一的公共输出光束。每个单独的光源在通过带通滤波器进入光路之前都经过准直。每个光源的滤光片也起到镜子的作用，反射来自先前光源的准直光束。在下图中，概述了每个位置的光路，包括发生的反射：

每个光源位置的光路从 0 到 3。光源的位置编号根据全反射数标记。

传统上，组合两个以上的光源需要使用二向色阶梯。二向色镜在光谱中的一点从透射切换到反射，允许组合单独的光源，前提是这些光源没有重叠波长。这种方法的缺点是光源不能轻易改变。

二向色阶梯还需要特别注意光源引入光路的顺序，以避免光线被排成一行的下一个二向色镜阻挡。通常，必须在二向色镜之前的每个光源前面添加额外的带通滤波器，以便为每个光源选择所需的波长范围。阶梯中使用的每个滤光片和二向色镜都会降低系统的总光输出。

特征
• 多功能 4 通道超高速 LED 光源
• 独特的光学设计允许简单的光谱灵活性
• 340-900nm 之间的各种可用 LED

常见应用
• 荧光显微镜
• 钙成像
• 富罗
• 光遗传学
• 高速波长选择

The Lambda 421 was designed to keep the size of the beam combiner small ａnd the optical path short ａnd efficient. Thin-film bandpass filters, such as Semrock’s STR, reflect greater than 90% of out-of-band light. If the band pass of each light source does not overlap, it is possible to use the filters for both attenuation ａnd reflection of the light from the other sources. By arranging the filters ａnd sources into a pentagon, we were able to combine four light sources in a compact design with lower losses than previously achievable. As an added benefit, the last position in the optical train does not require any filter, since no other input reflects from that position. This input can be used with any sort of light source as long as you are aware of the possible losses if there are filters in use that overlap this light source. The fifth side of the pentagon becomes the output for the combined sources. The filters are easily exchangeable ａnd are installed on small sliders inside the core of the pentagon. Filters ａnd associated light sources can be arranged in any order around the pentagon.

笔记：
• 来自位置 #0 的光直接进入设备输出而不会被反射。对于具有期望输出的源来说，此位置可能是。
• 第四个光源的滤光片不用作反射表面，如果需要宽带光源，则可以省略。
• 在少于 4 个光源的配置中，应从到的反射次数填充光源，以确保的光输出。
• The optical path for each input is tilted by 18 degrees relative to the filter for that port. This will cause a small shift in the band pass toward shorter wavelengths. While it would be ideal to have a coating optimized for this application, we have found that stock -STR filters can be used if you correct for the shift in the band pass when selecting the filters. This lends itself to combining narrow-band sources such as LEDs ａnd lasers with a broad-band sources such as an arc lamps or white light LEDs. In the case of LEDs, wavelengths can be shuttered at the speed of the individual source. Sutter Instrument HPX ａnd TLED products can switch in 10-25 microseconds respectively, making the Lambda 421 one of, if not the fastest wavelength switcher on the market. The Lambda optical beam combiner is designed for flexibility ａnd expandability. Should your illumination need change over time a simple configuration change ａnd possibly additional filters can produce an entirely different output.

Lambda 421 - LED 光谱选项（点击图片放大）