• Integrated Laser Driver Option
• Internal Alignment Laser Option
• Three Beam Block Option
• External Photodetector Accessory
• Standard Laser Source
• Bench-top Laser Driver

The Integrated Laser Driver option installs a 100 milli-amp multi-configurable laser driver in the Interferometer head. Laser output can be laser current loop or sense diode current loop controlled. The driver supports RF modulation of the laser current when using a Laser Diode RF Modulation driver (available separately). The Integrated Laser Driver also supports an external photo-detector (see External Photo-detector Option) which can be used to perform complete current versus power characterization. 

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The Internal Alignment Laser option adds a collimated laser source inside the Interferometer head. When actuated the source shines out of the center of the entry aperture. The alignment beam is co-axial to the optical axis of the instrument. Reflections of the alignment beam are seen as angular deviations in the WinCORE Alignment Mode. The alignment beam is extremely useful in setting the tilt of components relative to the optical axis. 

An example use Internal Alignment Laser would be the measurement of a readout objective lens for an optical disk drive pick-up head. In this example a Pinhole Laser source is recollimated by the readout objective into the Interferometer. Since optical disk drive objectives are compensated for the thickness of the disk substrate, a disk "simulator" piece must be inserted in the measurement path. The alignment sets the tilt in sequence of the pinhole source, the disk simulator, and then the readout objective. The alignment beam is powerful enough to reflect off of the mounting flange of the readout objective lens so its tilt can be adjusted.

(The WinCORE application supports monitoring of the Internal Alignment Laser diode and be set to automatically turn off the laser after selectable time periods, thus conserving short lifetime diodes such as the new violet diodes.)

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Many optical pickup designs employ a multi-spot tracking method.  This method use a grating to generate two auxiliary side beams that will cause overlapping interferograms and frustrate the measurement of the center beam's wavefront quality.  This option uses an internal block to remove these side beams and allow for proper measurement of the center beam.  

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External Photodetector Accessory

This accessory expands the Internal Laser Diode Driver option by providing an external photo-detector that plugs into the Interferometer.  The detector mounts to the front of the Interferometer where it can be moved in and out of the entry aperture.

Standard Current versus Power (I v. P) measurements can be made when the laser under test is driven by the Internal Laser Diode Driver.

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This is a sturdy brass construction laser source designed to be mounted in a standard NRC 5-axis mount.  This versatile source can accept 5.6 mm as well as 9 mm laser diodes, has a focus adjustment and comes with a set of apertures.  Can be ordered with or without a current driver and RF modulator PCB. 

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This universal laser diode driver supports the following feature list.

• Compatible with practically all types of diodes.
• Can drive two separate diodes at once.
• RF modulation support.
• Selectable laser current or sense diode current control loop.
• Completely controllable over ASCII based RS232 serial interface.
• Easy to use Windows application.
• External photo-detector input. Connect a photo-detector to make I vs. P plots.
• 3 DAC outputs for controlling PZT staging, etc.
• Large front panel display with optical encoder control.

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