Fig. 2. (a) Wedge sequence and pump beam propagation through the wedges. The HeNe beam co-propagates with the mid-IR beam, through blocks A, B and C (Fig. 1).The wire-grid polarizer is set at 45◦ relative to X and Y, the polarized reflected part is sent to the electronics to detect the interference between the two pump pulses which is used to phase the data. This polarizer is removed when perpendicular pump pulses are used (see Section 4) (b) He-Ne tracking schemes.
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