Newport's VA series of variable attenuators are composed of specially designed thin film polarizers, zero-order achromatic waveplates and high precision opto-mechanics, all incorporated into shuttered housings. The design is compact, robust and easy to use. Ideal for attenuating ultrafast amplified pulses.
The housing ensures the internal optics are free from dust and other contaminants, and eliminates perturbations of the beam due to ambient air conditions; crucial considerations in ultrafast laser applications. A manual shutter and beam dump are included to control the S- and P-polarized output beams.
Two thin film polarizers are prealigned in the housing and optimized for wavelengths ranging from 1034 - 1094 nm. The P-polarized output passes through the first thin film polarizer with negligible beam displacement, while the S-polarized output is reflected off both thin film polarizers and offset in parallel one inch.
By manually rotating a waveplate, the intensity ratio of the two output beams can be continuously varied while maintaining all other beam parameters.

• 类型

  Manual Variable Attenuator

• 衰减范围

  <0.2-99% (S-), <0.2-94% (P-) @ 1064 nm

• 波长范围

  1034 - 1094 nm

• 消光比

  >1:450 (after 1st polarizer), >1:500 (after 2nd polarizer)

• 损伤阈值

  >75 mJ/cm2, 100 fs at 1064 nm

• 通光孔径

  15 mm  

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Newport公司的VA系列可变衰减器由特殊设计的薄膜偏振器、零阶消色差波片和高精度光学机械组成，全部集成到百叶窗外壳中。设计紧凑，坚固耐用，使用方便。理想的衰减超快放大脉冲。

该外壳确保内部光学无灰尘和其他污染物，并消除因周围空气条件而引起的光束扰动;超快激光应用中的关键问题。包括手动快门和束流转储来控制S偏振和p偏振输出光束。

在壳体中预对准两个薄膜偏振器，并对波长从1034 - 1094 nm进行优化。p极化输出通过可忽略束位移的第一个薄膜偏振器，而s极化输出在薄膜偏振器和偏移量的平行1英寸反射。

通过手动旋转一个波板，两个输出光束的强度比可以在保持所有其他光束参数的同时连续变化。