Newport's LBP Series Laser Beam Profilers have evolved with the introduction of its Automatic Gain and Shutter Control to improve performance and ease of use. The LBP series laser beam profiling camera is a powerful software driven device with complete beam diagnostic measurement features, including a multi-measurement routine to increase signal integrity for higher accuracy results. For continuous or pulsed laser beams it provides an extensive range of graphical presentations and analysis capabilities of laser beam parameters such as: beam width, shape, position, power and intensity profiles.
Applications
- Laser beam optimization
- Gaussian fit analysis
- Quality control
- Beam alignment
Accessories
Newport provides an extensive set of accessories to accommodate various experimental requirements.
The LBP-SAM beam sampler allows sampling of the input power to the ratio of approximately 10-6 to avoid the damage of the CCD chip especially when a high power laser is characterized. The beam sampler comes with a mount and a built-in fan with a 5 V power supply to keep it cool while handling a high intensity laser beam.
LBP-SAM Beam sampler
The CCD camera is equipped with a built-in filter wheel enabling the use of up to four, 0.5 in. diameter attenuators. The system is supplied with three NG neutral density stackable filters ( LBP-NG4 , LBP-NG9 and LBP-NG10 ), while additional ones may be purchased separately. The camera can be post-mounted via a single 8/32-threaded hole centered directly below the sensor surface.
Multiple filters can be stacked up to increase attenuation. However, the filter can be damaged if a high power laser, which exceeds the damage threshold of the filter, is directly incident on it.
Other accessories include a 2X beam reducer, LBP-2X , expanding capability to measure beams ≈ 9 mm in diameter.
Transmission Curve for LBP-NG4
Transmission Curve for LBP-NG9
Transmission Curve for LBP-NG10
Software
Using the LBP software, included on an accompanying CD, your computer becomes a powerful beam diagnostic tool. This user-friendly system presents graphical and numerical information for an intuitive interpretation of data in real-time.
The profile can be displayed using the vertical/horizontal profile, Gaussian fit, auto scale or Gaussian/top hat mode. The vertical/horizontal profile displays the profiles from two orthogonal axes (horizontal and vertical). Each image is a digital representation of the spatial power distribution across the beam. The Gaussian fit profile shows how closely the measured beam profile matches a Gaussian profile. Auto Scale displays the profiles using the full height of the profile window. You can easily toggle between 2D and 3D graphical presentation with the click of a button.
The viewing angle can be changed from auto ranging, rotate angle or horizontal tilt. Auto rotate on/off allows the image to be rotated about the optical axis. Rotate angle sets the viewing angle to between 1° and 360° in 1° increments. Horizontal tilt sets the tilt viewing angle of the 3D projection with values ranging from 0° to 90°.
All the data collected by the LBP can be saved in a file with a .LOG extension. The data log files are stored in ASCII format so they can be easily printed, viewed, and analyzed by other programs. The data log file contains general information including system parameters at the time of the log operation, such as the amount of averaging used, shutter level, Null (Offset) indication, zooming parameter and the size of the picture frame. The end of the data log file contains a statistics summary of all the measured parameters, including the minimum measured value, maximum measured value, average measured value, as well as the standard deviation for each parameter.
The software also provides the user the ability to record a video or take still images of the beam profile for analysis.
Screen shot showing various measurement capabilities of LBP software such as ROI, centroid line and measurement data (beam peak, width and correlation to name a few).
Specifications
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LBP-1-USB
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LBP-2-USB
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LBP-3-USB
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LBP-4-USB
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| Camera and PC Board |
| Operating Modes |
1) Interline camera mode for CW operation and 2) frame transfer mode for pulsed operation. |
| Sensor Size [in. (mm)] |
0.255 x 0.190 (6.47 x 4.83) |
| Minimum Measurable Beam Size (µm) |
150 |
| Spectral Range (nm) |
190-1100 |
350-1100 |
350-1310 |
350-1310 & 1550 |
| Dimensions [in. (mm)] |
ø2.9 x 2.07 x 2.2 (ø73 x 52.5 x 56) |
| Computer Interface Cable |
PCI |
| Sync out for triggering laser |
Female RCA Connector |
| PCI Operation |
| Card Type |
1/3 size PCI bus card, plug and play |
| PCI Connections (for other cameras) |
S-Video, MXC or Composite Video |
| Minimum Computer System Requirements (for PCI Operation) |
Pentium 3, 800 MHz, 128MB RAM
100MB HD free, Windows 2000/Vista/ and Windows 7 (32 bit)
2MB 256 color VGA card, one CD ROM drive
1024 x 768 resolution VGA display |
| USB Operation |
| USB2.0 Attachment |
USB-A type Connector, 90 cm long cable, 8 pin mini DIN female connector for camera,
DC 12V, 0.75 A(1) input connector for power supply (included) |
| USB2.0 Connections |
MXC |
| Minimum Computer System Requirements (for USB Operation) |
Pentium 4, 2 GHz, 256MB RAM
100MB HD free, Windows 2000/Vista/XP and Windows 7 (32 and 64 bit)
16MB 16 bit color VGA card, one CD ROM drive (USB 2.0 version)
One free High Speed USB 2.0 port
1024 x 768 resolution VGA display |
| System Performance with Software |
| Dynamic Range |
>1011:1 using software controlled gain control, electronic shutter and external filters (3xNG10 filters) |
| Shutter Speeds (sec) |
1/50 - 1/100,000 |
| Software Controlled Gain (dB) |
6 - 60 |
| Maximum Frame Rate (Hz) |
25 |
| Lowest Measurable Signal |
LBP1, LBP2: ~0.5 nW/cm2 at 633 nm
LBP3: ~1.5uW/mm2 at 1310nm
LBP4: ~5uW/mm2 at 1550nm |
| Saturation Intensity |
About 1 mW/cm2 (1 µJ/cm2) with no filters installed (models LBP1,LBP2).
About 5mW/cm² no filters (model LBP4)
With filters installed this value will increase by a factor of 2 x 104 to 106 depending on wavelength. |
| Damage Threshold |
50 W/cm2 (1 J/cm2) for all filters installed (NG4, NG9 and NG10) |
| Null |
In CW mode, Null Function is available to automatically subtract background. |
| Handling of Pulses |
Ability to capture and replay pictures and statistics from a slowly pulsing laser (1 - 100 Hz) while filtering out frames with no laser pulse. Gain control and external filters make it easy to obtain optimum intensity. |
| Software Trigger |
In pulsed mode, sliding bar control allows setting of threshold so as to display only frames with captured pulses. |
| Max. Frequency for Single Pulse Display (kHz) |
10 |
(1) for LBP revision A-C having SN:3000 and up. For LBP SN less than 3000, revision A-C, needs DC 5 V, 1 A input connector for power supply. Revision D-without external power supply.
Note: Windows 7 compatibility for hardware revision D and above. Hardware revision is included in serial number.
