The phosphor-coated SP907 camera accurately captures and analyzes wavelengths from 1440nm - 1605nm. It features a very small package, adjustable gain and exposure control, a customizable region of interest (ROI), and built-in pre-triggering circuitry that makes it ideal for telecom mode field analysis.
5.3mm x 7.1mm active area with an effective 60µm pixel pitch
23 fps at full resolution
BeamGage Standard or Professional software include
Features
ֺ 1440-1605nm Wavelengths
ֺ NIR Telecom mode field analysis
ֺ NIR Laser beam analysis
Phosphor Coating Technology
The up-conversion from NIR to visible light in the 1550 series cameras is nonlinear.
The anti-Stokes phosphor coating produces visible photons at a rate roughly the
square of the input signal. This is shown dramatically where the camera total output
increases dramatically faster than a linear output shown in the bottom line. The CCD
camera saturation in the center of a beam, the up-converted visible signal drops as
the square of the input signal. Thus the lower signal wings of a beam are suppressed,
resulting in the appearance and measurement of a beam width much smaller than
actual.
This illustration is a comparison of the cross-section of a beam with and without correction. As seen, the real width of the beam is much greater than would be observed without correction.
Wavelength Response
The anti-Stokes up-conversion efficiency is very wavelength dependent. This graph shows the typical spectral response curve of a new, high response coating. As seen, we have calibrated the response from 1527nm to 1605nm. We have extrapolated the shorter wavelength region by comparing our measured response to data published over the entire range.
Phosphor Coated Cameras with Spiricon's BeamGage software
Spiricon's engineers have carefully measured the non-linearity of the signal generated by the Phosphor Coated series cameras. The software in the BeamGage incorporates an algorithm to correct for the non-linearity. This illustration shows the linearity obtained, showing in the top line that the low level signals drop linearly, rather than at the square of the input, seen in the lower line.
The two photos show the uncorrected and corrected camera beam shape in 3D. See the BeamGage section for additional information on the beam analyzer.
Item
Specification
Model
SP907-1550
Application
NIR wavelengths, 1/1.8" format,low resolution
Spectral Response
1440 - 1605nm
Active Area
7.1mm x 5.3mm
Pixel spacing (1)
7.38μm x 7.38μm
Number of effective pixels
964 x 724
Minimum system dynamic range (2)
~30 dB
Linearity with Power
±5%
Accuracy of beam width
±5%
Frame rates in 12 bit mode (3) (5)
23 fps at full resolution
Shutter duration
30μs to multiple frames
Gain control
0 dB to 24 dB
Trigger
Supports both trigger and strobe out
Photodiode trigger
InGaAs response: SP90409
Saturation intensity (1)
7mW/cm2 at 1550nm
Lowest measurable signal (1)
50μW/cm2
Damage threshold
50W/cm2 / 0.1J/cm2 with all filters installed for < 100ns pulse width (4)
Dimensions
48mm x 44mm x 20.2mm
CCD recess
4.5mm
Operation mode
Interline transfer CCD
Software supported
BeamGage STD and PRO
PC interface
USB 3.0
Notes:
(1) Despite the small pixel size, the spatial resolution will not exceed 50μm due to diffusion of the light by the phosphor coating.
(2) Signal to noise ratio is degraded due to the gamma of the phosphor’s response. Averaging or summing of up to 256 frames improves dynamic range by up to 16x = +24 dB.
(3) In normal (non-shuttered) camera operation, the frame rate is the fastest rate at which the laser may pulse and the camera can still separate one pulse from the next. With electronic shutter operation, higher rate laser pulses can be split out by matching the laser repetition to the shutter speed.
(4) This is the damage threshold of the filter glass of the filters. Assuming all filters mounted with ND1 (red housing) filter in the front. Distortion of the beam may occur with average power densities as low as 5W/cm2.
(5) Highly dependent on PC processor and graphics adapter performance.
Drawings
Ordering
BGS-USB-SP907-1550-OSI
SP90419
BeamGage Standard software, software license, 1/1.8” format 964x724 pixel camera with 4.5mm C mount CCD recess. Phosphor coated to 1550 nm. Comes with USB cable and 3 ND filters
BGP-USB-SP907-1550-OSI
SP90420
BeamGage Professional software, software license, 1/1.8” format 964x724 pixel camera with 4.5mm C mount CCD recess. Phosphor coated to 1550 nm. Comes with USB cable and 3 ND filters
BM-USB-SP907-1550-OSI
SP90426
BeamMic software, software license, 1/1.8” format 964X724 pixel camera with 4.5mm CCD recess. Phosphor coated to 1550 nm. Comes with USB cable and 3 ND filters
BeamGage Training DVD
SP90429
How to become a great user of the world’s most powerful laser beam analysis software