Greenwald M, Smith W I
Appl Opt. 1977 Mar 1;16(3):587-90. doi: 10.1364/AO.16.000587.
A high rejection, high transmission, triple grating polychromator with crossed dispersion has been designed and constructed for Thomson scattering plasma diagnostics. Identical gratings, collimating, and field lenses were used for all three stages. A mechanically convenient arrangement was made possible by using the field lenses to adjust the dispersion of the second stage to the required design value. The transmission in the passband for light polarized perpendicular to the rulings of the grating was measured at 33% for the instrument itself, and at 15% through the instrument and 1.8 m of attached fiber optics. With the 30-nm passband set 4-34-nm wavelengths away from the ruby laser line, the order of 10(-11) of 694-nm light incident in the input slit was present in each 3-nm wide output channel, giving a relative rejection factor of 10(-10).
为汤姆逊散射等离子体诊断设计并制造了一种具有交叉色散的高抑制、高透射率的三光栅多色仪。三个阶段均使用了相同的光栅、准直透镜和场透镜。通过使用场透镜将第二阶段的色散调整到所需的设计值，实现了一种机械上方便的布置。对于垂直于光栅刻线偏振的光，该仪器本身的通带透射率测量为33%，通过仪器和1.8米连接光纤后的透射率为15%。当30纳米的通带设置在距离红宝石激光线4 - 34纳米的波长处时，入射到输入狭缝的694纳米光的10^(-11)量级出现在每个3纳米宽的输出通道中，相对抑制因子为10^(-10)。
