Galvo-Galvo Scan Head and Controller

Features

• Optical Scan Range of ±15° (±7.5° Mechanical Scan Range) for Beams up to Ø4 mm
• Driven by User-Supplied DC, Sine, or Sawtooth Wave Signal
• BNC Connectors for Position Control and Readout
• Compatible with National Instruments Cards and Breakout Boxes
• Protected Silver Coating for High Reflectance in Visible and NIR
• Compact Scan Head Housing is SM Threaded, 30 mm Cage System Compatible, and Post Mountable

Our LSKGG4(/M) Galvo-Galvo Scanner contains two galvo scan mirrors that deflect an incident laser beam in X and Y. Identical to the galvo-galvo scanner used in our Bergamo® II multiphoton microscopes and complete Cerna®-based confocal systems, each mirror has a mechanical scan range of ±7.5°, corresponding to an optical scan range of ±15°. This range is large enough to explore the entire diffraction-limited FN20 field of view of Thorlabs' SL50 scan lenses for laser scanning microscopy.

A National Instruments (NI) 68-pin connector is available to directly control and monitor the scanner via an NI card or breakout box (not included). The beam can also be steered by supplying DC, sine, or sawtooth wave drive signals through two BNC connectors. For sine wave signals, a maximum scan rate of 500 Hz is supported. Two additional BNC connectors provide X and Y position feedback signals. This scanner is also compatible with Vidrio's ScanImage software.

Each scan mirror has a protected silver coating that provides high reflectance in the visible and NIR; see the Specs tab for details. Since the coating is metallic, its performance varies minimally over the ±7.5° mechanical scan range of the mirror.

The scan head is connected to the controller using the included DB25 cable. If using the BNC input connectors to drive the galvo mirrors, a drive voltage of ±10 V at an impedance of 200 kΩ will be required for each axis. The BNC output connectors have a voltage range of ±3.75 V and an impedance of 2 kΩ.

The LSKGG4 galvo-galvo scanner can be incorporated into a DIY laser scanning microscopy setup.

Mounting
The input face of the scan head has internal SM05 (0.535"-40) threads, internal SM1 (1.035"-40) threads, and four Ø6 mm bores spaced for our 30 mm cage system. The output face has internal SM1 threads and four 4-40 taps for our 30 mm cage system.

Please note that the scan lens needs to be positioned such that its entrance pupil is at the midpoint between the galvo mirrors; when being used at the input, the distance is 27.255 mm, while at the output, the distance is 29.045 mm. For the  Scan Lens, an () Cage System Size Adapter can be used to convert the 30 mm cage system to a 60 mm cage system to mount and position this scan lens at the correct distance using a  Cage Plate. To mount an , , or  Scan Lens at the correct distance from the scanner a special adapter is available by contacting Tech Support.

The scan head weighs 0.56 kg, so it may be useful to support it directly using a Ø1/2" post or Ø1" post. Four 1/4"-20 tapped holes (M6) are located on the bottom.

Cutaway View of Galvo-Galvo Scan Head
The scan lens being used with the scan head needs to be positioned such that its focus is at the midpoint between the X and Y Mirrors. The distance between the mirrors is indicated by the green line. For the input, that distance corresponds to 27.255 mm, while for the output, that corresponds to 29.045 mm. The input port has internal SM05 threads, internal SM1 threads, and four Ø6 mm bores for a 30 mm cage system, while the output port has internal SM1 threads and four
4-40 taps for a 30 mm cage system.

LSKGG4 Manual.	More specs and info.