Phase Shift Controllers

Durango Interferometry Software typically provides phase shifting by controlling the analog voltage applied to a PZT phase shifter. Diffraction International phase shifters are low voltage devices that shift nominally 4.7 fringes at +10 V for 633 nm wavelength. This is the typical voltage range of digital-to-analog devices that can be installed in or connected to a desktop or laptop computer.

Many interferometers require a phase shift voltage in the range 100 V to 1000 V. This will require a voltage amplifier between the controller device and the phase shifter. Diffraction International phase shifters will require a voltage amplifier when used with interferometers operating at mid-IR or LWIR wavelengths.

Durango can control wavelength shifting interferometers, usually by means of an analog current. Diffraction International has also developed custom software modules that enable Durango to control a number of other phase shifting and wavelength shifting devices.

Phase Shift Controllers
Device	Form Factor	I/O Connector	Adapter to LEMO	Volts Out	Current Out	Resolution	Update Rate
NI PCIe-6321	PCI Express	68-pin VHDCI		±10 V	5 mA	16 bits	900 kS/s
NI PCI-6221	PCI	37-pin D-SUB		±10 V	5 mA	16 bits	900 kS/s
NI PCI-6024E	PCI	68-pin SCSI-II		±10 V	5 mA	12 bits	10 kS/s
NI USB-6211	USB	LEMO*		±10 V	2 mA	16 bits	250 kS/s
NI DAQCard-6024E	PCMCIA	68-pin VHDCI		±10 V	5 mA	12 bits	1 kS/s
*LEMO connector added by Diffraction International