Difference between revisions of "Homodyne"
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| Line 152: | Line 152: | ||
|- | |- | ||
| PS1.0-6b TO | | PS1.0-6b TO | ||
| − | | 0.43 A/W | + | | 0.43 A/W (@ 606 nm) |
| 1 mm<sup>2</sup> | | 1 mm<sup>2</sup> | ||
| 0.05 nA | | 0.05 nA | ||
| Line 159: | Line 159: | ||
|- | |- | ||
| Hamamatsu | | Hamamatsu | ||
| + | | 0.39 A/W (@ 606 nm) | ||
| 1.1 mm<sup>2</sup> | | 1.1 mm<sup>2</sup> | ||
| − | + | | 0.07 nA | |
| − | | 0. | ||
| 3 pF | | 3 pF | ||
|- | |- | ||
Latest revision as of 14:08, 7 November 2019
Contents
Detectors- Kazan
Improvements:
- larger ground holes(viases)
- PD case to ground
- small capacitors to 1206 case
- label cathode and anode
- change pin order
- distance between holes for screws is unequal (54.11mm and 52.94mm)
- change photodetector holder to have hole and post
- DIS pin is shorted to gnd, should be high
- It oscillates, has offset (due to mismatch between R8 and R10), wide electronic noise
- Make sure, that R8 and R10 are matched well.
| PWR [mW], mV | #1 | #2 | #3 | #4 | #5 | #6 |
|---|---|---|---|---|---|---|
| 2 | 19.2 | 21.4 | 19.4 | 26.8 | 19.6 | 22 |
| 1.75 | 19.2 | 21.4 | 19.4 | 23.2 | 19.6 | 22 |
| 1.5 | 16.3 | 18.4 | 16.2 | 21 | 16.8 | 18.6 |
| 1.25 | 14.5 | 16.5 | 13.6 | 18.4 | 14.7 | 16.8 |
| 1 | 12.55 | 14.4 | 11.8 | 14.8 | 12.5 | 14.5 |
| 0.75 | 10.2 | 11.4 | 9.55 | 11.8 | 10.2 | 11 |
| 0.5 | 7.35 | 8.3 | 7 | 7.5 | 7.1 | 7.76 |
| 0.25 | 3.5 | 4 | 3.04 | 3.05 | 2.95 | 3.7 |
| PWR [mW], | #1 | #2 |
|---|---|---|
| 5 | 3.5 | |
| 4.5 | 3.5 | |
| 4 | 3.5 | -3.22 |
| 3. | 3.5 | -3.22 |
| 2 | 3.4 | -3.24 |
| 1.5 | 2.5 | -2.55 |
| 1 | 1.75 | 1.76 |
| 0.75 | 1.26 | -1.26 |
| 0.5 | 0.85 | -0.84 |
| 0.25 | 0.43 | -0.4 |
Pins layout
Soldered board
Detectors responsivity
Board
Board
Photodiodes comparison
| Diode | Responsivity | Active area | Dark current | Capacitance | Rise time |
|---|---|---|---|---|---|
| PS1.0-6b TO | 0.43 A/W (@ 606 nm) | 1 mm2 | 0.05 nA | 5-20 pF | 10-30 ns |
| Hamamatsu | 0.39 A/W (@ 606 nm) | 1.1 mm2 | 0.07 nA | 3 pF |
The detector is photodiode First Sensor PS1.0-6B Photodetectors manufacturer First Sensor, part number PS1.0-6B-TO52S1.3.
The detector used in original homodyne by Hamamatsu: S5972
Shot noise and thermal noise
Shot noise accompanies a flow of electric current. Any resistor at any given temperature emits thermal noise. Amplification is a nonequilibrium process, and thus amplification involves noise sources other than thermal sources.[1]
Homodyne schematic
Heterodyne detection
Main aspects of homodyne detection.
References
- ↑ Hermann Haus, Electromagnetic noise and quantum optical measurements, (/Cold Atoms/Books)
- ↑ Hermann Haus, Electromagnetic noise ans quantum optical measurements, (New York: Academic Press, 2005), 23-5.
- ↑ Hermann Haus, Electromagnetic noise ans quantum optical measurements, (New York: Academic Press, 2005), 23-5.
