DG-4
(Click on picture for larger image)
DG-4 ULTA HIGH SPEED WAVELENGTH SWITCHER
The Lambda DG-4 offers unprecedented speed and versatility for experiments requiring rapid light wavelength switching. It offers all the advantages of interference filter- based systems, yet eliminates the temporal constraints imposed by filter switching devices. Switching between any two wavelengths is achieved in less than the 1.2msec vertical retrace period of a video signal, allowing you to perform real-time video imaging. For dual wavelength ratio imaging studies, the Lambda DG-4 enhances your ability to follow fast changes in ion concentrations by acquiring a ratio pair in two consecutive video frames.
Narrow bandpass sysrems, such as single cavity interference filters, grating monochrometers, and A.O. modulators, will, by their nature, pass harmonics of the desired wavelength. With variable wavelength devices, such as gratings, it is not always possible to obtain sufficient blocking of out-of-band wavelengths. Modern interference filters, as used in the Lambda DG-4, have integral blocking characteristics 1000 times better than typical monochrometer systems. In addition, it is difficult to adjust the intensity of one wavelength relative to another in a traditional system with a single optical path and a variable wavelength device. The dual galvanometer design of the Lambda DG-4 eliminates this problem.
How it works:
This unique optical design of the Lambda DG-4 is based on dual scanning galvanometers. One galvanometer is placed at the focus of the arc lamp and is used to reflect the lamp output through one of four optical channels that may contain an interference filter. After the light passes through a filter, it is sent to a second scanning galvanometer mirror that directs the light to a light guide which provides spatial uniformity. The light can be coupled to the illumination port of an instrument (e.g. epi-illumination port of a microscope). By controlling the relative orientation of the two scanning mirrors, intensity of the output can be modulated. Thus this system can provide narrow band excitation at selected wavelengths over a range of intensities or can rapidly turn off the light source. Dwell time at any wavelength is arbitrarily set by the user. Transitions are achieved in less than 1.2msec.
FEATURES
Complete system for wavelength switching
Intergral shuttering and filtering
Intergral neutral density filtering
Two outputs for monitoring filter position
Methods of control
When operated in this mode, the Lambda DG-4 control commands are a subset of our Lambda 10-2 controller and will operate with software writtenfor the Lambda 10-2. (to take full advantage of the features of the Lambda DG-4, we recommend checking with your software vendor for the appropiate driver)
Up to 32 filter sequences can be downloaded into a ring via keypad or computer. the system will change to the next filter in the buffer on a strobe pulse. Eachsubsequent pulse will cause a move to the next filter in the buffer. After executing the last filter change in the string the system resets to the first filter and continues.
A video sync pulse can be used to initiate the filter change for each sequence stored in the ring buffer. Stand-alone operation of the Lambda DG-4 is achieved in this mode using only a video sync input.
The system will implement a filter change on the video sync pulse, but only if the strobe line is held low. This allows a computer to overide the sync pulse.
SPECIFICATIONS
Output Range
300nm to 700nm
Output Power
7.5m Watts @340nm
8.2m Watts @380nm (Measured at light guide output)
Lamp Type
175 Watt ozone free xenon, pre-aligned
Lamp Life
1,000 hours
(All bulbs warrantied for 500 hours. Longer life depenrs on your application. Expected life is 1000 hours.)
Power Comsumption
350 Watts
Filter Diameter
1in
25mm
Dimentions
10in x 10in x 19in
25cm x 25cm x 48cm
Light Guide
2 meters long
3mm wide
Weight
45lbs
20kg
Electrical
115/230 Volts
50/60 Hertz power line
ORDER INFORMATION
BASIC SYSTEM
DG-4/OF Includes Lambda DG-4 unit, pre-aligned 175 Watt ozone free xenon bulb, 4 slide in filter holders, 1 neutral density filter nolder, serial and parallel cables, liquid light guide,and manual.
DG-4/FS Same as DG-4 but with 175W full spectrum bulb (note: full spectrum bulb produces ozone, and will require additional ventilation of the lamp exhaust. Contact our technical support staff for details)
ACCESSORIES
O661176* Ozone free 175 Watt xenon bulb (attenuated output below 350nm, 80% at 340nm)
O661175* Full spectrum 175 Watt xenon bulb
DG-IF Interference filter holder
DG-ND Neutral density filter holder
X100160 Retaining ring
X100150 Filter spacer
* Please note that the above bulbs do not include the outer blue housing.
Mounting Adapters for Nikon, Zeiss, Leica and Olympuss microscopes are available. Please call Sutter Instrument Company for pricing and further information. Also, please see the adapter list at the end of this section.
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