ELL14 Motorized SM1 Optic Rotator Chapter 1: Introduction
Rev. B, Feb 2020 Page 1
Chapter 1 Introduction
The ELL14 is part of the Thorlabs series of resonant piezo motor circuits and bare modules for OEM applications. This SM1-
threaded Optics Rotator can be adapted to 30 and 60 mm cage systems and can also be adapted for post mounting – see
section 3.1 for more details.
The resonant piezo design of these motors offers fast response times and precise positioning and is therefore particularly useful
in scanning applications.
The high-speed digital signal processing (DSP) architecture supports a multi-drop serial communication protocol, and a set of
digital IO lines allows the user to control the movement and state manually by switching the lines high (5V) or low (0V).
The rotator features a central SM1-threaded aperture to accept an optic, and delivers a travel range of 720° rotation. The angular
position is requested and displayed from 0 to 359.99°. If a rotator is driven past the 359.99° rotation point, the display reverts
back to zero and counts up to 359.99° again. Furthermore, the unit will not respond to requests for a move to a position greater
than 359.99° and an error message will be generated. It is designed for closed loop applications requiring rotational positioning
with 44.0 µrad of resolution.
Homing is achieved using a combination of a reflecting optical sensor (IR) for coarse (0.5 to 1.0 mm) positioning, then a magnetic
sensor for fine (1.0 µm resolution) positioning. Using the ELLO software, the user can modify the offset value to shift the homing
position (up to a ¼ of turn). Furthermore, coarse homing can be selected in a clockwise (CW) or counter clockwise (CCW)
direction (fine homing is always performed in a CCW direction to guarantee repeatability).
Note
The module must be powered via an external 5V power supply. A suitable PSU is supplied in the kit. For customers
wanting to use a third party PSU, the Connector on the interface board is a DC Jack connector, 6.3mm OD (GND),
2.1mm ID (+5V).
A hand-held controller is supplied with the ELL14K evaluation kit to allow homing and manual jogging and/or positioning. The
unit can also be driven remotely via PC-based software, downloaded from
www.thorlabs.com. A compatible USB driver and
source code are included in the software download package.
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