VTC-4000 Near-Field Camera
VTC 4000 – Fast testing of VCSEL arrays in the near-field range with the highest degree of accuracy
Instrument Systems’ VTC 4000 near-field camera is developed specifically for the ultrafast, precise 2D analysis of VCSEL arrays. It enables polarization-controlled characterization of all relevant parameters simultaneously for the single emitters of the array. Thanks to a unique calibration concept, 2D quality analysis performs with unprecedented measurement accuracy. The VTC 4000 camera is traceably calibrated to national standards (PTB) and delivers measurements with absolute precision.
The VTC 4000 is available in two versions:
• VTC 4000 without fiber output, for determining power, polarization, and spatial radiation properties of single emitters (VTC4000-100)
• VTC 4000 with fiber output, for additional analysis of wavelengths with a spectrometer (VTC4000-200)
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Features
The 2D near-field analysis of VCSEL arrays with VTC 4000 Features:
• Ultrafast 2D characterization of VCSEL arrays in the near field
• Model versions without and with fiber output for the connection of a high-resolution spectrometer from our CAS series
• Simultaneous analysis of single emitters in the camera’s field of view for power, degree/angle of polarization and position
• Individual evaluation of single emitters for divergence, numerical aperture, M² value and spatial radiation properties
• Spectral analysis and determination of wavelength (only with VTC 4000-200)
• High resolution camera with 12 MP resolution
• Calibration possible in range 910 – 980 nm
• Traceable to national standards (PTB) factory calibration for power
• Efficient SDK for simple implementation in dealer systems
Polarization-controlled measurement concept guarantees highest precision
The innovative calibration concept of the VTC 4000 is based on flat-field and polarization correction. Polarization correction takes place in the form of an in-line analysis of the emitted light and corrects the polarization dependence of the optical system. This calibration enables absolute measurement of the power and polarization properties of each single emitter within the camera’s field of vision in a one-shot process.
This unique measurement concept guarantees a minimum error budget in power measurement and results in high measurement accuracy, as currently offered by no other VCSEL measuring system.
Ultrafast quality control of single emitters
Only a single 2D camera image is required for the measurement of power and polarization of several light spots within the camera’s field of view. This is used to analyze the homogeneity of the array and detect diverging emitters. This ultrafast quality control can be implemented within a production line.
Spatial radiation properties of single emitters
The spatial radiation properties of single emitters are characterized with the aid of a z-positioning unit using the VTC 4000. Capturing several camera images in different z-positions provides a measurement of the emission waist. This allows one to calculate the divergence, numerical aperture and der M² value for each emitter.
Determination of wavelength
The VTC 4000 is also available in a version with a fiber output that connects to high-resolution spectrometers of our CAS series. This enables the spectral analysis of an emitter in the center of the image. To analyze the spectra of all single emitters of an array, the VTC 4000 can be implemented in an xy-positioning unit.
VTC 4000 – The perfect solution for near field measurement of VCSEL arrays
The VTC 4000 is developed for the near field analysis of VCSEL arrays and provides the optimum measurement solution both in the lab and in the production environment.
Applications include tests for all VCSEL fields of application, in particular 3D sensing for smartphones (e.g. facial and object recognition) and in the automotive industry (e.g. LiDAR systems).
Measurement solutions with the VTC 4000 always deliver fast and accurate results for analysis and quality control at single emitter level.
Applications
- VCSEL Arrays
- 3D sensing for smartphones for facial and object recognition
- Automotive industry including LiDAR systems
Click here for Application Note “Testing Solutions for VCSELs”
Specifications
| Model versions
Camera sensor |
VTC 4000-100
12 MP CMOS |
VTC 4000-200
12 MP CMOS |
|---|---|---|
| Fiber output for connection of a high-resolution spectrometer | No | Yes |
| Measurement results | Power, polarization, position, emission characteristics, incl. numerical aperture and M² value (with z-positioning unit) | Power, polarization, position, emission characteristics, incl. numerical aperture and M² value (with z-positioning unit), wavelength (with xy-positioning unit) |
| Power range for a typical single emitter (10 µm diameter) | 20 nW – 385 mW | 40 nW – 770 mW |
| Radiometric measurement accuracy | 6 % | 6 % |
| Field of view | 1.4 mm x 1.0 mm | 1.4 mm x 1.0 mm |