Ultra High Speed Wavelength Switcher

COMPLETE SYSTEM FOR WAVELENGTH SWITCHING

The Lambda DG-4 / DG-5 Plus is a complete integrated 300 Watt light source and wavelength switching excitation system.

Four or five interference filters can be easily installed in the DG-4 or DG-5 Plus, respectively. An additional standard neutral density filter can be inserted in the common path of the light.

The light guide output from the Lambda DG-4 / DG-5 Plus provides uniform spatial illumination, as well as vibration isolation from your microscope.

A cold mirror assembly eliminates IR radiation, extending the lifetime of the optics and the light guide and preventing the exposure of the sample to IR when white light is necessary.

INTEGRAL SHUTTERING
The Lambda DG-4 /DG-5 Plus provides a high speed shutter function with open/close times of 500µs. The shutter function reduces light intensity by 5 to 6 orders of magnitude.

If complete light shuttering is required, a mechanical shutter (i.e. SmartShutter™) can be incorporated into the Lambda DG-4 / DG-5 Plus.

INTEGRAL NEUTRAL DENSITY FILTERING
Neutral density filtering is achieved by offsetting the output galvanometer such that light is not centered on the liquid light guide. Up to 15 logical filters can be defined with this method. Due to the scrambling effect of the light guide, the output has excellent uniformity.

Direct insertion of neutral density optical filters is also possible in the filter holders at any of the four optical channels. A final neutral density optical filter can be placed in the exiting light path which will reduce the light output from all optical channels.

TWO OUTPUTS FOR MONITORING FILTER POSITION
A 4 bit TTL signal transmits the current optical channel (filter) position.

A digital-to-analog converter (DAC) output produces a voltage showing which filter is in use.

TURBO BLANKING
The turbo blanking feature is designed for situations when the switching is done between non-adjacent filter positions. When the instrument is in this mode, the input and output galvanometer mirrors move out of sync, thus preventing the sample from being exposed to light of unwanted wavelength during switching and shuttering.

DIRECT COMPUTER CONTROL
Computer control of the instrument is possible via parallel or serial port.