Rev: 2.4, 16-Jul-2021 © 2021 Thorlabs Page 1
1 General Information
PDB2xx Series
1 General Information
The Thorlabs PDB2xx Series of Balanced Amplified Photodetectors consist of two well-
matched, photodiodes and an ultra-low noise, high-speed transimpedance amplifier that gener-
ates an output voltage (RF OUTPUT) proportional to the difference between the photo currents
in the two photodiodes, i.e. the two optical input signals. Additionally, the unit has two fast mon-
itor outputs (MONITOR+ and MONITOR-) to measure the individual optical input power level as
well as low frequency modulated signals on each detector separately.
The PDB2xx Series slim line housing has three tapped holes (8-32 or M4) for convenient
mounting to the optical setup. The input apertures for free space beams have both external
SM1 and internal SM05 threads that are compatible with Thorlabs SM1- and SM05-threaded
accessories. The included SM1T1 lense tube coupler allows mounting of external SM1-
threaded accessories (e.g. external optics, filters, apertures, or fiber adapters).
The PDB2xx Series is shipped with an external linear power supply.
The PDB210A(/M) and PDB210C(/M) as well as PDB220A2(/M) operate from DC up to 1 MHz
and feature photodiodes with a large active area and are available as imperial or metric ver-
sions. Here, the tapped mounting holes have different threads for imperial and metric version:
8-32 or M4, respectively.
PDB230A and PDB230C operate from DC up to 100 MHz with a active area of the photodiodes
being smaller compared to PDB210x(/M) and PDB220A2(/M). The mounting holes have combi
threads for both 8-32 and M4 threads for mounting with imperial or metric posts.
1.1 Ordering Codes and Accessories
The following models of the PDB2xx Series are available:
PDB210A 1 MHz, Fixed Gain, Large Area Balanced Amplified Photodetectors with Si PIN
Photodiodes, Imperial 8-32 Mounting Threads
PDB210A/M 1 MHz, Fixed Gain, Large Area Balanced Amplified Photodetectors with Si PIN
Photodiodes, Metric M4 Mounting Threads
PDB220A2 1 MHz, Fixed Gain, Large Area Balanced Amplified Photodetectors with UV en-
hanced Si PIN Photodiodes, Imperial 8-32 Mounting Threads
PDB220A2/M 1 MHz, Fixed Gain, Large Area Balanced Amplified Photodetectors with UV en-
hanced Si PIN Photodiodes, Metric M4 Mounting Threads
PDB210C 1 MHz, Fixed Gain, Large Area Balanced Amplified Photodetectors with
InGaAs PIN Photodiodes, Imperial 8-32 Mounting Threads
PDB210C/M 1 MHz, Fixed Gain, Large Area Balanced Amplified Photodetectors with
InGaAs PIN Photodiodes, Metric M4 Mounting Threads
PDB230A 100 MHz, Fixed Gain, Large Area Balanced Amplified Photodetectors with UV
enhanced Si PIN Photodiodes, Combi-Thread Mounting Holes Compatible with
8-32 and M4 Threads
PDB230C 100 MHz, Fixed Gain, Large Area Balanced Amplified Photodetectors with
InGaAs PIN Photodiodes, Combi-Thread Mounting Holes Compatible with 8-32
and M4 Threads
According to Thorlabs general detector part numbering system, the suffix “A” indicates Si pho-
todiodes while the suffix “C” indicates InGaAs photodiodes.
AC-coupled versions as well as special versions with an open detector (cover glass removed)
are available upon request. Please contact Thorlabs for details.
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