ABL-100
Figure 19. ABL-100 unit. EO crystal is not shown. EO crystal
and focusing lens are not included.
Overview
The ABL-100 is an integrated balanced detectiondevice with automatic tuning for hands-free and
long-term stable operation, compensating drifts due to changes in humidity and temperature. Balanced detection is achieved when S and P polarizations of the probe beam are balanced to give zero net current in absence of terahertz. An electro-optic crystal breaks the balance when it senses the presence of a terahertz wave.
Features
‣ Hands free, set and forget operation
‣ High sensitivity wide area photo-diodes
‣ Small footprint, integrated package
‣ Easy alignment and operation
‣ Anti-reflection coatings for all optics
‣ High-extinction ratio calcite Wollaston prism
(<5 10-6)
‣ User selectable balance point
Figure 20. Typical EO sensing schematic. The Quarter Wave Plate (QWP) balances the detector in absence of terahertz radiation so that net current is zero. Terahertz illuminating the EO crystal will cause changes in its birefringence, breaking the balance between S and P polarizations. Shaded area indicates components included in ABL-100.
Specifications
Model1 ABL-100 ABL-100-1kHz ABL-100-10Hz |
|
P/N |
15-ABL-STDX-006 |
15-ABL-1KHZ-007 |
15-ABL-10HZ-008 |
Modulation range |
DC - 300 kHz |
1 - 5 kHz |
<100 Hz |
Laser repetition rate |
≥10 MHz |
1 - 5 kHz |
<100 Hz |
Wavelength |
|
740 - 860 nm |
|
Voltage/Current Mode Output (max) |
|
±5 V / 1 µA |
|
Output Connector |
|
SMA |
|
Dimensions / Weight 1. EO crystal and focusing lens not included. |
|
4.5” x 2” x 2.25” / 0.5 lb. |
|