Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision |
slice:dcc [2019/08/29 00:28] – [Rear-Panel Modulation] Michael Radunsky | slice:dcc [2019/09/24 22:11] – [Triggering] Michael Radunsky |
---|
</WRAP> | </WRAP> |
| |
The SLICE-DCC Current Controller is intended for driving laser diodes. When using lasers particular care must be given to exposure hazards. | The SLICE-DCC Current Controller is intended for driving laser diodes. When using lasers particular care must be given to avoid exposure hazards. |
| |
{{ d2:d2-100:class_iiib.png?430 }} | {{ d2:d2-100:class_iiib.png?250 }} |
=====Description===== | =====Description===== |
| |
| SLICE-DC-2000 | 2 A | | | SLICE-DC-2000 | 2 A | |
</tabcaption></WRAP> | </tabcaption></WRAP> |
=====Purchase Includes===== | ===== Purchase Includes ===== |
* SLICE-DCC dual-channel Current Controller | * SLICE-DCC dual-channel Current Controller |
* AC power cord with appropriate wall plug for you location (if known) | * AC power cord with appropriate wall plug for you location (if known) |
* Two 6 ft SMA cables | * Two 6 ft SMA cables |
* Two D2-007 Breakout boards | * One BNC grounding cap for door safety interlock |
* One 50 Ω terminator for rear-panel safety interlock | |
* Two keys for lock out | * Two keys for lock out |
* Final Test Documentation | * Final Test Documentation |
| |
If either the key switch is deactivated or the interlock is opened while the system is operating, the SLICE-DCC will stop delivering current and the Enable window will flash red with INTERLOCK displayed (<imgref inter_open>). In order to resume normal operation, interlocks must be restored to their operational state and the window must be touched to reset the tripped interlock. | If either the key switch is deactivated or the interlock is opened while the system is operating, the SLICE-DCC will stop delivering current and the Enable window will flash red with INTERLOCK displayed (<imgref inter_open>). In order to resume normal operation, interlocks must be restored to their operational state and the window must be touched to reset the tripped interlock. |
| </WRAP> |
| |
| <WRAP center round important 100%>Always power down the SLICE-DCC completely before making connections to a laser. |
| Never connect or disconnect the SLICE-DCC to/from a laser with the SLICE-DCC energized. |
| |
| As with __any__ diode laser and controller, improper usage can cause irreparable damage to the diode. |
</WRAP> | </WRAP> |
=====Specifications===== | =====Specifications===== |
<WRAP center round box 60%><tabcaption specs|Specifications of SLICE-DCC> | <WRAP center round box 60%><tabcaption specs|Specifications of SLICE-DCC> |
| **Performance((Subject to change without notice))** || | | **Performance((Subject to change without notice))** || |
^ **Parameter** ^ **Value** ^ | ^ **Parameter** ^ **Value** ^ |
| Channels | 2 | | | Channels | 2 | |
| Control | Touch Screen, GUI, Serial commands | | | Control | Touch Screen, GUI, Serial commands | |
| Operation Modes | Constant Current\\ Constant Power | | | Operation Modes | Constant Current\\ Constant Power | |
| \\ \\ Maximum Current | 200 mA\\ 500 mA\\ 1 A\\ 2 A | | | \\ \\ Maximum Current | 200 mA\\ 500 mA\\ 1 A\\ 2 A | |
| \\ \\ Current Noise((Constant Current Mode)) ((rms 10 Hz to 1 MHz)) | 1.5\\ 4\\ 10\\ 15 | | | \\ \\ Current Noise((Constant Current Mode)) ((rms 10 Hz to 1 MHz)) | 1.5\\ 4\\ 10\\ 15 | |
| Modulation Bandwidth | DC to >1 MHz | | | Modulation Bandwidth((3 dB)) | DC to >1 MHz | |
| Modulation Depth | ±10 mA | | | Modulation Depth | ±10 mA | |
| Modulation Transfer Function | 1 mA/V | | | Modulation Transfer Function | 1 mA/V | |
| Modulation Input Range | ±10 V | | | Modulation Input Range | ±10 V | |
| Current Resolution | 100 µA | | | Current Resolution | 100 µA | |
| Drift | <25 µA/°C | | | Drift | <25 µA/°C | |
| Power Stability((constant power mode)) | 0.1% rms((relative to maximum power)) | | | Power Stability((constant power mode)) | 0.1% rms((relative to maximum power)) | |
| Maximum Compliance Voltage | 12 V | | | Maximum Compliance Voltage | 12 V | |
| Triggering | TTL | | | Triggering | TTL | |
</tabcaption></WRAP> | </tabcaption></WRAP> |
| |
- CH 2 Photodiode input | - CH 2 Photodiode input |
| |
<imgcaption back|View of rear of SLICE-QTC>{{ :slice:dcc:dcc_back_labelled.png?600x300 |}}</imgcaption> | <imgcaption back|View of rear of SLICE-DCC>{{ :slice:dcc:dcc_back_labelled.png?600x300 |}}</imgcaption> |
| |
| |
<imgcaption enter_butt|Enter button>{{ :slice:slice-qt-enter.jpg?76x76 |}}</imgcaption> | <imgcaption enter_butt|Enter button>{{ :slice:slice-qt-enter.jpg?76x76 |}}</imgcaption> |
Accepts parameter edits and exits keypad. | Accepts parameter edits and exits keypad. |
| |
| ==== Extendable Legs ==== |
| The SLICE-DCC has four extendable legs (<imgref belly>). Extending the front legs allows easy viewing from above (<imgref dcc_prod_shot>) and extending the rear legs (<imgref side>) allows easy viewing from below. |
| |
| <WRAP half column><imgcaption belly|Underside of SLICE-DCC>{{ :slice:dcc:dcc_underbelly_labelled.png |}}</imgcaption> |
| </WRAP> |
| <WRAP half column><imgcaption side|Side view of SLICE-DCC configured for viewing from below>{{ : slice:dcc:slice-dcc_looking_down.png?400 |}}</imgcaption></WRAP> |
===== SLICE-DCC Operation ===== | ===== SLICE-DCC Operation ===== |
The Home screen displays the status of both channels (<imgref home_scr_dcc>). The data for each channel is arranged vertically. At a glance, for each channel, I<sub>set</sub>, and Compliance Voltage can be read. Touching the blue window labelled Voltage [V] will cause this window to toggle from displaying Compliance Voltage to displaying dissipated Power. | The Home screen displays the status of both channels (<imgref home_scr_dcc>). The data for each channel is arranged vertically. At a glance, for each channel, I<sub>set</sub>, and Compliance Voltage can be read. Touching the blue window labelled Voltage [V] will cause this window to toggle from displaying Compliance Voltage to displaying dissipated Power. |
On the rear panel of the SLICE-DCC is an input for servoing or modulating the current output. (<imgref back>, item 9). The transfer function for this input is 1 mA/V and the input range is ±10 V. Therefore the current can be modulated by ±10 mA. The 3-dB bandwidth of this modulation input is DC to 1 MHz. | On the rear panel of the SLICE-DCC is an input for servoing or modulating the current output. (<imgref back>, item 9). The transfer function for this input is 1 mA/V and the input range is ±10 V. Therefore the current can be modulated by ±10 mA. The 3-dB bandwidth of this modulation input is DC to 1 MHz. |
| |
Although there is protection circuitry to avoid reverse biasing the diode, it is not advisable to modulate under conditions where the current would be driven in reverse polarity. | <WRAP center round box 60%> |
| | {{ :warning-sign.png?300&nolink }} |Although there is protection circuitry to reduce reverse biasing the diode, negative voltages as high as -0.5 V can be applied. It is not advisable to modulate under conditions where negative voltage would be applied. Avoid low current set points with large-amplitude modulation.| |
| | {{ :warning-sign.png?300&nolink }} |Make sure that the modulation input cannot drive the current above the maximum rated current for your device by [[slice:dcc#Setting the Current Limit|setting the Current Limit appropriately]]. | |
| </WRAP> |
| |
==== Constant Power Mode ==== | ==== Constant Power Mode ==== |
| |
<WRAP center round box 60%> | <WRAP center round box 60%> |
| {{ :warning-sign.png?300&nolink }} | Warning. Make sure the Current Limit is set below the recommended maximum current for your laser diode and that the monitor photodiode is working and delivering a signal to the SLICE-DCC before engaging Constant Power mode. If a signal proportional to the laser power from the monitor diode is not delivered to the SLICE-DCC, the current may ramp to its maximum allowed value when Constant Power mode is engaged.| | | {{ :warning-sign.png?400&nolink }} | Warning. Make sure the Current Limit is set below the recommended maximum current for your laser diode and that the monitor photodiode is working and delivering a signal to the SLICE-DCC before engaging Constant Power mode. If a signal proportional to the laser power from the monitor diode is not delivered to the SLICE-DCC, the current may ramp to its maximum allowed value when Constant Power mode is engaged. | |
</WRAP> \\ | </WRAP> \\ |
- Connect the output of the monitor photodiode to the CH X Photodiode Input connector (labelled "10" in [[slice:dcc#rear_panel|the back-panel image]]) on the back of the SLICE-DCC.\\ \\ In order for Constant Power mode to operate correctly, the user must set three control parameters: the responsivity of the monitor photodiode, the gain of the loop filter, and the polarity of the photodiode response. Before setting these control parameters. first [[slice:dcc#setting_the_operation_mode|set the SLICE-DCC in Constant Power mode]] and [[slice:dcc#setting_the_operating_power_in_constant_power_mode|set the Power Setpoint]]. From the home screen, enter the CH X Settings screen by tapping the window labelled CH X: Constant Power. Enter values for Detector Response, Gain, and monitor photodiode Polarity. \\ \\ | - Connect the output of the monitor photodiode to the CH X Photodiode Input connector (labelled "10" in [[slice:dcc#rear_panel|the back-panel image]]) on the back of the SLICE-DCC.\\ \\ In order for Constant Power mode to operate correctly, the user must set three control parameters: the responsivity of the monitor photodiode, the gain of the loop filter, and the polarity of the photodiode response. Before setting these control parameters. first [[slice:dcc#setting_the_operation_mode|set the SLICE-DCC in Constant Power mode]] and [[slice:dcc#setting_the_operating_power_in_constant_power_mode|set the Power Setpoint]]. From the home screen, enter the CH X Settings screen by tapping the window labelled CH X: Constant Power. Enter values for Detector Response, Gain, and monitor photodiode Polarity. \\ \\ |
External control of the SLICE-DCC is accomplished via a TTL trigger.((https://en.wikipedia.org/wiki/Logic_level)) 0 to 0.8 V TTL is low and 2 to V<sub>CC</sub> is TTL high. | External control of the SLICE-DCC is accomplished via a TTL trigger.((https://en.wikipedia.org/wiki/Logic_level)) 0 to 0.8 V TTL is low and 2 to V<sub>CC</sub> is TTL high. |
=== Trigger Out === | === Trigger Out === |
The Trigger Out on the back panel of the SLICE-DCC can be programmed to go high if an interlock (key or door) is opened. The screen shown in <imgref trigger_out> will be reached by touching I/O > Trigger Out. Checking either box will cause the Trigger Out to go high if either the door interlock or the key interlock is opened. | The Trigger Out on the back panel of the SLICE-DCC can be programmed to go high if an interlock (key or door) is opened. The screen shown in <imgref trigger_out> will be reached by touching I/O > Trigger Out. Checking the box will cause the Trigger Out to go high if either the door interlock or the key interlock is opened. |
<imgcaption trigger_out|Setting an output trigger>{{ :slice:dcc:output_trigger.png?430x254 |}}</imgcaption> | <imgcaption trigger_out|Setting an output trigger>{{ : slice:dcc:trigger_interlock.png?430x254 |}}</imgcaption> |
=== Trigger In === | === Trigger In === |
The input trigger can be used to turn on or off the current for either or both channels. From any screen, touch I/O > Trigger In. You will be presented with the window in <imgref trigger_in>. Select which channels you wish to control with the incoming trigger. In <imgref trigger_in_2>, current to CH 2 will be disabled if the Trigger In goes high. | The input trigger can be used to turn on or off the current for either or both channels. From any screen, touch I/O > Trigger In. You will be presented with the window in <imgref trigger_in>. Select which channels you wish to control with the incoming trigger. In <imgref trigger_in_2>, current to CH 2 will be disabled if the Trigger In goes high. |
| DCC| TBD| TBD| | | DCC| TBD| TBD| |
</tabcaption></WRAP> | </tabcaption></WRAP> |
From time to time, Vescent will upgrade the firmware for controlling the SLICE-QTC. The procedure to upgrade the firmware is given [[slice:dcc:firmware|here]]. | From time to time, Vescent will upgrade the firmware for controlling the SLICE-DCC. The procedure to upgrade the firmware is given [[slice:dcc:firmware|here]]. |
| |
=== Host GUI === | === Host GUI === |
The GUI should now actively control the SLICE-DCC. You should only have to do the above steps once from a given PC. After assigning the COM port, the system will recognize the device in the future (unless you reassign the COM port to another device). | The GUI should now actively control the SLICE-DCC. You should only have to do the above steps once from a given PC. After assigning the COM port, the system will recognize the device in the future (unless you reassign the COM port to another device). |
===== Firmware Update ===== | ===== Firmware Update ===== |
From time to time, Vescent will upgrade the firmware for controlling the SLICE-QTC. The procedure to upgrade the firmware is given [[slice:qt:firmware|here]]. | From time to time, Vescent will upgrade the firmware for controlling the SLICE-DCC. The procedure to upgrade the firmware is given [[slice:dcc:firmware|here]]. |
===== Serial API ===== | ===== Serial API ===== |
It is possible to control the SLICE-QTC through serial commands. Click here to access the [[slice:qt:API|SLICE-QTC API]]. | It is possible to control the SLICE-DCC through serial commands. Click here to access the [[slice:dcc:API|SLICE-DCC API]]. |
| |
More information coming soon. Please contact [[[email protected]|sales [at] vescent [dot] com]] for information. | Please contact [[[email protected]|sales [at] vescent [dot] com]] for information. |
| |
===== Maintenance ===== | ===== Maintenance ===== |