Dual logarithmic photodetector
Absorption measurements for spectroscopy setups
345 €
Ref.: PD10R
| Quantity | Price |
|---|---|
| 1+ | 345 € |
| 10+ | 305 € |
Product details
| Parameter | Min | Typ. | Max | Unit | Note |
|---|---|---|---|---|---|
| Operating wavelength | 900 | 1700 | nm | ||
| Optical power | -67 | 7 | dBm | 0 dBm = 1 mW | |
| 3 dB bandwidth | 1.2 | MHz | for optical power > -10 dBm / 100 µW | ||
| Logarithmic slope | 30 | mV / dBm | between -50 and 7 dBm | ||
| Supply voltage | 3.3 | 15 | V |
- Dimensions: 38 mm x 53 mm x 12 mm
- Operating wavelength: 900 - 1700 nm
- Optical power: -67 - 7 dBm (0 dBm = 1 mW)
- 3 dB bandwidth: 1.2 MHz (for optical power > -10 dBm / 100 µW)
- Logarithmic slope: 30 mV / dBm (between -50 and 7 dBm)
- Supply voltage: 3.3 - 15 V
- Dimensions: 38 mm x 53 mm x 12 mm
More photodetectors
Characterization
The figure below shows the voltage measured on the two outputs log(A) and log(B) vs. the optical power incident on photodiodes A and B respectively. Optical power was generated with a 1550 nm DFB laser followed by a variable optical attenuator and measured with a Thorlabs PM100D / S155C power meter.
We observe a linear behavior between -50 dBm (10 nW) and 7 dBm (5mW).
Absorption measurement
The PD10R can perform accurate absorption measurements with small amounts of optical power. We used the setup below to observe the absorption lines of a HCN gas cell with 200 nW of total optical power. Optical source is a DFB laser whose temperature is increased linearly from 10 to 25 °C in 60 s. The absorption path and the reference path are connected respectively to the A and B inputs of the PD10R.
The three outputs log(A), log(B) and log(A/B) have been recorded simultaneously during the 60 s temperature sweep. Intensity variation observed on the log(A) and log(B) channels are nicely rejected on the log(A/B) output. Numerical computation of log(A/B) from log(A) and log(B) is represented in the cyan curve.
