Features IEEE 1394 (FireWire) connectivity 12-Bit Dynamic Range 1/2" Video Format External Asynchronous Trigger and Software Trigger Exposure and Gain Control Single shot, pulsed, or continuous wave operation Photon FireWire BeamPro Acquisition and Analysis Software stand-alone GUI with M2 Analysis ActiveX Automation Interface Small form factor (62mm H x 140mm W x 210mm L) + Gimbal Mount Cover glass removed to eliminate fringes 2% Beam Diameter Accuracy ~5% M2 Accuracy

The ModeScan Model 1780 is a laser beam profiling instrument that measures the M 2 Beam Propagation Ratio and all associated ISO 11146 parameters instantaneously in real time at video rates to over 20Hz. The measurement technique, patented by Photon Inc., uses 10 reflective surfaces to form simultaneous images of the propagating beam at 10 locations on a Model 2512 CCD array camera. With all ten measurement positions acquired at once, the instrument is suitable for measurement of both CW and pulsed lasers down to single-shot rates. Beam diameters are obtained with NIST-traceable accuracy to better than 2% using the Photon Model 2512 12-bit FireWire BeamPro. This translates to M² measurements with accuracy to ~5%. The FireWire system operates under Photon's renowned BeamPro Acquisition and Analysis Software in Microsoft Windows. The compactness of the system and the IEEE 1394 "FireWire" interface offers enhanced ease-of- use and portability. The ability to operate in any orientation allows for easy placement on any optical bench and saves valuable bench space.

The CCD is sensitive from ~250nm to 1100nm wavelengths. The standard configuration is supplied with a glass OD 2.8 C-mount neutral density filter for wavelengths >380nm, and an OD 3.0 Fused Silica Inconel neutral density filter for wavelengths <380nm. Because of the limited usefulness of exposure control with pulsed lasers, the Photon Inc. Model ATP is recommended for use with pulsed lasers with repetition rate <~10kHz and wavelength >380nm. For pulsed lasers with wavelength <380nm, a variable UV filter or a combination of UV filters will generally be required.

FireWire BeamPro Acquisition and Analysis Software
The ModeScan 1780 operates under the FireWire BeamPro Acquisition and Analysis Software. The FireWire BeamPro Software was written specifically for Microsoft Windows XP Professional^* or Microsoft Windows 2000 Professional^* and takes full advantage of the menu driven, multi-windowing environment. The software provides quantitative measurement of numerous beam spatial characteristics in accordance with the ISO 13694 standard and M² parameters according to the ISO 11146 standard. The software operates in 2 modes: the M² Beam Propagation mode and the standard Beam Profiling mode. The M² Beam Propagation mode includes a live Video window for displaying the 10 beam spots, a Measurement view showing the beam caustics, and the Beam Statistics view, a tabular summary for the M² parameters and beam diameters with Pass/Fail analysis. Time Statistics views with strip chart time displays summary statistics -overlays are also available- and a Notes view for entering text. In the standard mode, all the features for beam analysis are available for closer inspection of a single beam. Additional window are the Profiles, 2D Topographic, 3D, and the Pointing Views.

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^*Vista Operating System not supported.

ISO 11146 Standard M2 Beam Parameters Beam Propagation Ratio M2 Divergence Beam Waist Diameter Beam Waist Location Rayleigh Length Major and Minor axes Astigmatism Software Window Views for Data Display and Visualization M2 Beam Measurement Caustics Video Dual Aperture Profiles Beam Statistics 3D Profile View 2D Topographic View Up to 15 Time Statistics Charts Pointing Notes PC Specifications 1.8GHz or faster Pentium IV Processor Windows XP Professional SP1 or Windows 2000 Professional SP3 Operating System OHCI compliant IEEE 1394a (FireWire Port): Powered port required 512 MB of RAM CD-ROM Drive 30MB free space on hard disk SVGA display monitor 64MB Color SVGA graphics card Mouse or other pointing device Keyboard Writeable CD recommended for data archiving

All Specifications are subject to change without notice.

Figure 1. Sample software GUI showing 10 beam spots in the Video view, ISO Standard Beam Propagation parameters in the Beam Statistics view, and the beam caustic in the Measurement View

Figure 2. ModeScan 1780 Measurement Range for M2 =1