Sensor Head F01
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Customer Information PicoScale sensor head type F01 Specification Sheet SmarAct GmbH Table 1. Summary of optical properties (for a typical sensor head with a focal distance of 10 mm). Wavelength Optical output power Laser output mode single mode Beam waist diameter (d0 ) Working range Beam divergence Beam geometry The F01 is a sensor head type with focused probe beam. This allows to measure displacements of small targets. Furthermore, the sensor heads provide high angular tolerances. Angular working After pre-collimation, an integrated beam splitter splits the light into a reference and probe beam as shown in figure 1. The reference beam is reflected off the reference mirror which is coated to one side of the beam splitter cube. The probe beam is focused by a lens system and exits the head. The front surface of the beam splitter marks the absolute zero position of every PICOSCALE measurement as here the probe and reference beam are of equal length. Thus, the working distance (WD) is not equal to the distance from the head (i.e. focal length F) since the lens system is only integrated into the probe beam. 10 5 15 Distance from head [mm] Figure 2. Beam diameter as function of the distance from the head (for a sensor head with a focal distance of 10 mm). 1.1 Beam properties The probe beam has its waist at a customizable focal distance. The resulting beam diameter is dependent on the focal distance of the lens system and is typically in the range of 20 to 120 µm. The beam exhibits a large divergence and the beam diameter increases significantly if the target is away from the focal point, cf. figure 2. 1.2 Working distances (WD) The PICOSCALE sensor head F01 is optimized for probe mirrors close to the focal point. Due to the inevitable divergence of the laser beam, the optical power collected by the sensor head decreases if the target moves away from the focal point. Figure 3 shows the expected optical signal for varying dis- Figure 1. Schematic drawing of t

tances. We recommend operation within ±0.5 mm around the specified focal length. Angular working range Minimum AWR: ±2.2° beam 2 mm off rotation axis Customer Information PicoScale sensor head type F01 - Specification Sheet — 2/4 −3 10−2 10−1 Distance from head [m] Figure 3. Recovered optical signal as function of the distance from the head (typical values for a F01-10 sensor head). Figure 4. Angular working range for a typical sensor head F01. The target mirror is placed at the focal point, which is not the pivot point here. The typical minimum angular working range is determined to ±2...

Customer Information PicoScale sensor head type F01 - Specification Sheet — 3/4 Beam splitter ratio (BSR) In standard sensor heads the laser beam is equally split into the reference and the probe arm. In order to increase the signal-to-noise ratio when working with targets with low reflectivity, the beam splitter should guide more power into the probe beam. Therefore, the beam splitter ratio can be customized. 2. Vacuum compatibility The standard sensor heads are designed to operate in ambient conditions. However, all sensor heads can optionally feature high vacuum, ultra-high vacuum or...

©SmarAct GmbH, 2017 A|| rights reserved Customer Information PicoScale sensor head type F01 - Specification Sheet — 4/4 5. Order code The order code of the sensor heads is built as follows: PS -SH -F01 -A -B -D -E -F -G -H The placeholders can be replaced by the respective option code. These code are given in the table below. If you do not specify an option, the default value is used. Category Shortcut Description SmarAct GmbH Phone: +49(0)441-800 879-0 Germany Email: info@smaract.com SmarAct GmbH Schuette-Lanz-Strasse 9 D-26135 Oldenburg Germany