Difference between revisions of "Homodyne"
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* change photodetector holder to have hole and post | * change photodetector holder to have hole and post | ||
* DIS pin is shorted to gnd, should be high | * DIS pin is shorted to gnd, should be high | ||
| − | *It oscillates, has offset, wide electronic noise | + | *It oscillates, has offset (due to mismatch between R8 and R10), wide electronic noise |
| + | * Make sure, that R8 and R10 are matched well. | ||
| + | |||
{| class="wikitable" style="display: inline-table;" | {| class="wikitable" style="display: inline-table;" | ||
|+lambda=630nm HeNe (orange) | |+lambda=630nm HeNe (orange) | ||
| Line 140: | Line 142: | ||
</gallery> | </gallery> | ||
===Photodiodes comparison=== | ===Photodiodes comparison=== | ||
| + | {| class="wikitable" | ||
| + | |- | ||
| + | ! style="text-align:left" | Diode | ||
| + | ! Responsivity | ||
| + | ! Active area | ||
| + | ! Dark current | ||
| + | ! Capacitance | ||
| + | ! Rise time | ||
| + | |- | ||
| + | | PS1.0-6b TO | ||
| + | | 0.43 A/W (@ 606 nm) | ||
| + | | 1 mm<sup>2</sup> | ||
| + | | 0.05 nA | ||
| + | | 5-20 pF | ||
| + | | 10-30 ns | ||
| + | |- | ||
| + | | Hamamatsu | ||
| + | | 0.39 A/W (@ 606 nm) | ||
| + | | 1.1 mm<sup>2</sup> | ||
| + | | 0.07 nA | ||
| + | | 3 pF | ||
| + | |- | ||
| + | |} | ||
The detector is photodiode [https://www.mouser.ca/datasheet/2/313/PS1.0-6b_TO_501429-586466.pdf First Sensor PS1.0-6B] [https://eu.mouser.com/ProductDetail/First-Sensor/PS10-6B-TO52S13?qs=hIohqi1S7IpnxK5X5xc9dg== Photodetectors] manufacturer First Sensor, part number PS1.0-6B-TO52S1.3. | The detector is photodiode [https://www.mouser.ca/datasheet/2/313/PS1.0-6b_TO_501429-586466.pdf First Sensor PS1.0-6B] [https://eu.mouser.com/ProductDetail/First-Sensor/PS10-6B-TO52S13?qs=hIohqi1S7IpnxK5X5xc9dg== Photodetectors] manufacturer First Sensor, part number PS1.0-6B-TO52S1.3. | ||
| Line 154: | Line 179: | ||
<ref>Hermann Haus, ''Electromagnetic noise ans quantum optical measurements'', (New York: Academic Press, 2005), 23-5.</ref> | <ref>Hermann Haus, ''Electromagnetic noise ans quantum optical measurements'', (New York: Academic Press, 2005), 23-5.</ref> | ||
<ref>Hermann Haus, ''Electromagnetic noise ans quantum optical measurements'', (New York: Academic Press, 2005), 23-5.</ref> | <ref>Hermann Haus, ''Electromagnetic noise ans quantum optical measurements'', (New York: Academic Press, 2005), 23-5.</ref> | ||
| − | + | [[File:Homodyne-schematics.png|300px|thumb|left| Homemade homodyne schematics]] | |
| − | [[File:Homodyne-schematics.png|300px|thumb| | ||
| − | |||
==Heterodyne detection== | ==Heterodyne detection== | ||
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.
