Features

DWC-10 beam alignment sensor features:

• • Beam monitoring in both transverse plane (XY) and longitudinal (Z) directions;
  • Measurement of beam parameters & low order term wavefront aberrations;
  • Real time XYZ0 in a single and affordable sensor;
  • Self calibrated;
  • USB Connection to PC;
  • Compact Housing: H: 44.00 mm, W: 44.00 mm, L: 25.40 mm;
  • Intuitive GUI Software: Alignment Tool.

PhaseView‘s DWC-10, incorporate CMOS cameras with 1.3 Megapixel resolution, providing accurate measurements of beam parameters and wavefront aberrations of low orders.

DWC-10 allows real time centering and beam quality adjustments. XY position of the incoming beam tilt, defocus and astigmatism can be quickly and accurately adjusted. In addition, power, beam size and ellipticity are provided to ease beam monitoring.

GUI Software

The DWC-10 comes with the Alignment tool software for fast XYZ0 beam line adjustments.

DWC-10 can be upgraded to become compatible with the GetLase LE software for full low & high order aberrations measurement and wavefront analysis, please refer to DWC-15 section Overview & Tutorial.

How a Digital Wavefront Camera (DWC) Works

A Digital wavefront Camera does not use lenslet array, instead, the beam is split to form two image planes onto a CMOS camera using a beam splitter. This allows real time acquisition of two intensity images (Image 1 & Image 2) of the incoming beam along its propagation axis. The beam propagation distance between the two image planes is given by the distance dZ. The wavefront measurement plane is at the exact position of the camera detector plane.

Real time acquisition of Images 1 & 2.

dZ is the beam propagation distance between Image plane 1 and Image plane 2

DWC-10 is operated with the Alignment Tool software. DWC-10 can be upgraded to become compatible with GetLase LE software providing full low and high wavefront orders and Zernike analysis. Please refer to DWC-15 Tutorial section.

When DWC-10 is operated with Alignment tool software, the beam shape is analyzed in real time with fast & accurate image processing. By comparing beam shape variations of the two image planes, xy position and low order aberrations (tilt, defocus and astigmatism can be measured).

Understanding with Basic Examples

Software

DWC-10 comes with the Alignment tool software for quick and fine adjustments of XYZ0 beam parameters adjustments with 4 quadrants display for intuitive user adjustment.

Alignment Tool

The Alignment Tool software provides the ability to monitor light beams in both transverse plane (XY) and longitudinal direction (Z), in one single device without moving components, by measuring:

• • XY Beam Position;
  • Tilt;
  • Defocus;
  • Astigmatism;
  • Beam Parameters: power, size, ellipticity.

Alignment Tool Software

Window showing measurements of XY Beam Position, Tilt, Defocus & Astigmatism, with the possibility to check these parameters against user-defined tolerances.

Alignment Tool Software

Window showing parameters of the beam incident on the camera.

Features

• • Intensity distribution and simultaneous real-time wavefront measurement;
  • High spatial wavefront resolution 350 x 350 : no lenslets, each pixel serves as a measurement point;
  • Self calibrated wavefront sensor;
  • Use with CW or Pulsed Light Sources;
  • USB Connection to PC;
  • Compact Housing: H: 44.00 mm, W: 44.00 mm, L: 25.40 mm;
  • GUI Software & Software Development Kit (Option).

PhaseView‘s DWC-15 incorporate CMOS cameras with 1.3 Megapixel resolution, providing accurate measurements of the wavefront shape and intensity distribution of beams.

As a lenslet-free wavefront sensor, DWC-15 has no restrictions for the number of Zernike coefficients that can be reconstructed. Furthermore, there is no compromise between spatial resolution an dynamic range. The DWC-15 provides 350 x 350 measurement points that allows aberration measurement from low to high order aberrations.

Calibration data is saved in camera memory, no additional procedure is requested.

For applications that need fast measurement speed, a sub sampling of the real wavefront data is provided.

Intensity data with Digital Wavefront Cameras is not sampled by a lenslet array, intensity distribution is achieved at pixel resolution of the imaging detector.

GUI Software

The DWC-15 comes with a software bundle : Alignment tool for fast XYZ0 beam line adjustments and GetLase Light Edition (LE) providing wavefront and intensity acquisition and analysis tools.

A software development kit is offered as an option for integration into custom systems.

How a Digital Wavefront Camera (DWC) Works

A Digital wavefront Camera does not use lenslet array, instead, the beam is split to form two image planes onto a CMOS camera using a beam splitter. This allows real time acquisition of two intensity images (Image 1 & Image 2) of the incoming beam along its propagation axis. The beam propagation distance between the two image planes is given by the distance dZ. The wavefront measurement plane is at the exact position of the camera detector plane.

Real time acquisition of Images 1 & 2.

dZ is the beam propagation distance between Image plane 1 and Image plane 2

DWC-15 can be operated by either the Alignment Tool software or GetLase LE software. For operation with Alignment Tool lease refer to DWC-10 tutorial section.

When DWC-15 is operated with GetLase LE software, intensity variations between the two images are measured and wavefront is calculated by solving the transport of intensity equation which relates intensity variations and wavefront.

Transport of intensity equation, relating the wavefront (φ) to the variation of intensity (I) along the beam propagation axis (z).

k – wave number

Understanding with Basic Examples

Parameters Affecting Digital Wavefront Camera Performance

Number of measurement points:

In comparison with Shack-Hartmann-based sensors, no restriction exists for the number of Zernike coefficients that can be calculated as each pixel serves as the wavefront measurement point. The imaging detector with its 1.3 Megapixel is split in two parts, leading to 350 x 350 measurement points for the beam analysis with lateral resolution of the order of the pixel size of 5.20 µm.

Dynamic range is related to:

• • The optical path difference between the planes where the two images are acquired;
  • The dimensions of the camera;
  • The camera resolution.

Measurement sensitivity is linked to:

• • The number of measurement points;
  • The signal-to-noise ratio (SNR) of the camera.

Software

The software bundle provided with DWC-15 includes:

• • Alignment tool for fast XYZ0 adjustments with intuitive & user friendly graphics displays;
  • GetLase LE, the most versatile and easy-to-use graphical interface for wavefront acquisition and analysis.

Alignment Tool

The Alignment Tool software provides the ability to monitor light beams in both transverse plane (XY) and longitudinal direction (Z), in one single device without moving components, by measuring:

• • XY Beam Position;
  • Tilt;
  • Defocus;
  • Astigmatism;
  • Beam Parameters: power, size, ellipticity.

Alignment Tool Software

Window showing measurements of XY Beam Position, Tilt, Defocus & Astigmatism, with the possibility to check these parameters against user-defined tolerances.

Alignment Tool Software

Window showing parameters of the beam incident on the camera.

GetLase LE

GetLase LE includes 4 simultaneous display of intensity, wavefront, Zernike and beam properties :

Intensity profiles & beam parameters:

• • Irradiance Distribution;
  • Maximum intensity levels, ellipticity of the beam spot;
  • Beam spot major and minor axis dimensions.

Wavefront & Zernike Display:

• • Measured and Reconstructed 3D Wavefront;
  • Max Variance of Wavefront, Peak-to-Valley (PV), and RMS of Wavefront;
  • Zernike coefficients & histogram of low orders: Tilt, Defocus, Astigmatism & higher orders: Coma, Spherical aberration, and higher up to 36 aberration terms.

Save & Export

• • Save projects & intensity images;
  • Flexible wavefront data export: Excel format, 3rd Party software;
  • Automatic data logging.

The software GetLase & Alignment Tool requires Windows® XP, Vista, 7, or later (32 or 64 bit). Availability of a USB 2.0 port is also required.

GetLase LE Software

Window showing 4 simultaneous displays of intensity in 3D, wavefront in 3D, Zernike analysis and beam intensity profiles.

GetLase LE Software

Window showing 4 simultaneous displays of intensity in 2D, wavefront in 2D, wavefront properties and beam intensity properties.

Optional Software Development Kit (SDK)

The software includes a driver package for constructing custom applications with GetLase’s core functions. Any language able to compile C can be used, including LabVIEW^TM.

Software Download

Click here to access evaluation software download center.