Readout Electronics - The standard SPS-300 detector readout electronics is incapable of reading the bolometer output in pico-second or even nano-second intervals. Hence this needs to be upgraded in order for the SPS-300 to capture the peak power of the THz pulse. This upgrade includes upgrades to the A/D electronics, the addition of a synchronization trigger with the external THz source, as well as the SPS-300 software. The SPS-300 software is only designed to use the peak power recorded for its interferogram calculation. Hence the customer may want to enhance or modify this software to measure the spectrum at other phases of the pulse such as for example, the beginning or end of the pulse cycle.
 
Technical Specifications
 
Bolometer

• Operating frequency range: 0.3-3 THz
• Noise Equivalent Power NEP: 3-5*10-13 W*HZ-0.5
• Response Time: 50 ps
• Bandwidth of cold (LHe temp.) HEMT amplifier:
• 50 MHz - 1 GHz
• Total gain (including room temperature amplifying): 65-70 dB
• Cold filter and window of the LHe cryostat: Black PE filtering and HDPE window
• Antenna type: Silicon hyper-hemispherical lens and log periodic spiral antenna
• Superconducting material of the sensitive element: NbN
• Winston cone or Si lens
• Bias tee
• Bias box
• Two stage amplifier

 
Cryostat

• Volume of liquid helium: 2 liters
• liquid helium hold time: more than 5 hours
• Input optical window diameter: 40 mm
• Weight: 18 kg
• Height: 490 mm
• Diameter: 260 mm
• Temperature on the cold plate: 4.2 K
• Output signal connector type: SMA-50 Ohm