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Spatial filterimage processing

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When a ray box is placed on one side of a converging (convex) lens and a screen is placed on the other side, a real image of the object (slit at front of ray box) can be formed on the screen. The ray box is moved and the image located on the screen. The object distance (u) and image distance (v) are measured. The focal length (f) can then be calculated using the formula: 1/f = 1/u + 1/v. Note 1: In this simulation a focal length (between 15 and 35 cm) is set initially and you need to calculate its value. Note 2: If the ray box is inside the focal point you do not get a real image. It is virtual and in front of the lens.

Spatial filterFME

Precision spatial filters are designed to remove spatial intensity variations of any low power laser beam (VIS to NIR). Spatial filter system accommodates a pinhole and a microscope objective (ordered separately) in opto-mechanics for 3 axis adjustment.

It is also possible to draw a graph, on graph paper, of 1/v (y-axis) against 1/u. The equation of the line can be compared to the standard form of linear equation, y = mx + c. In this case it is: 1/v = -1/u + 1/f. This cuts (intercepts) the y-axis (1/v axis) when x (1/u) is zero i.e. 1/v = 0 + 1/f. Similarly the line intercepts the 1/u axis when 1/v is zero, giving us 1/u = 1/f. From your graph get the average of the two intercepts, find the reciprocal to get the value of f.

990-1000 Precision Spatial Filter is a 3-axis translation stage with micrometer adjustment of pinhole and objective positions. These filters the beam from any low power, visible to near infrared laser. The result – the output beam is delivered with a smooth, near ideal intensity profile. The Spatial Filter consists of two YZ Positioners 990-0100 and Translation Stage 860-0060-04SF (modification of 860-0060-04). YZ Positioners for Lens, Pinholes and Objectives 990-0100 provides adjustments of the pinhole and objective in two axes. Precision X axis motion is provided by Translation Stage 860-0060-04SF. The pinhole and the objective should be selected and ordered separately. Provided selection of interchangeable microscope objective lenses and precision pinholes, allow you to build the best spatial filter for your laser.