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integrated balanced detection device

ABL-100

ABL-100

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
ABL-100
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.