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Laser electronics ldc1000, Operating Instructions Manual

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Laser electronics ldc1000 Operating Instructions Manual Download Page 27

 

27

The  Laser  Diode  Controller  accepts  only  parameter  values  which  are  within  the  predefined  range  or 
within the limits which have been set. 
Note: The word <Enter> represents the ENTER key on the PC keyboard. 

 

The following parameters can be read or read and set: 
 

Command 

Abbreviation  Parameter 

required 

Read 

only 

Key-in 

unit 

required 

Used 

unit 

Laser On/Off 

LAS 

 

 

- 

- 

Laser operating mode 

LMO 

∗

 

 

- 

- 

Pulse width (5.0ms < PUW < 490 ms) 

PUW 

∗

 

 

ms 

ms 

Pulse period (10 ms < PUP < 500 ms) 

PUP 

∗

 

 

ms 

ms 

Time limit (0.1 s < TIL < 99.9 s) 

TIL 

∗

 

 

s 

s 

Laser actual voltage 

ALV 

 

∗

 

- 

V 

Laser actual current 

ALC 

 

∗

 

- 

A 

Laser set current 

SLC 

∗

 

 

- 

A 

Laser actual power 

ALP 

 

∗

 

- 

W 

Laser  set power 

SLP 

∗

 

 

- 

W 

P1 –  power of calibration point 1 

P1P 

∗

 

 

- 

W 

I1 – current of calibration point 1 

P1I 

∗

 

 

- 

A 

P2 – power of calibration point 2 

P2P 

∗

 

 

- 

W 

I2 –  current of calibration point 2 

P2I 

∗

 

 

- 

A 

Power Monitor 

POM 

 

∗

 

- 

V 

Laser current limit 

LCL 

∗

 

 

- 

A 

Analog input enable 

AIE 

∗

 

 

- 

- 

Trigger input enable 

TIE 

∗

 

 

- 

- 

Actual temperature cooler 1 

AT1 

 

∗

 

- 

°C 

Set temperature cooler 1 

ST1 

∗

 

 

- 

°C 

Upper temperature limit cooler 1 

UT1 

∗

 

 

- 

°C 

Lower temperature limit cooler 1 

LT1 

∗

 

 

- 

°C 

P - control loop parameter cooler 1 

PV1 

∗

 

 

- 

- 

I  - control loop parameter cooler 1 

IV1 

∗

 

 

- 

- 

D - control loop parameter cooler 1 

DV1 

∗

 

 

- 

- 

Actual temperature cooler 2 

AT2 

 

∗

 

- 

°C 

Set temperature cooler 2 

ST2 

∗

 

 

- 

°C 

Upper temperature limit cooler 2 

UT2 

∗

 

 

- 

°C 

Lower temperature limit cooler 2 

LT2 

∗

 

 

- 

°C 

P - control loop parameter cooler 2 

PV2 

∗

 

 

- 

- 

I  - control loop parameter cooler 2 

IV2 

∗

 

 

- 

- 

D - control loop parameter cooler 2 

DV2 

∗

 

 

- 

- 

Cooler 1 enable 

CE1 

∗

 

 

- 

- 

Cooler 1 sensor 

CS1 

∗

 

 

- 

- 

Cooler 1 current (set current in %) 

CC1 

 

∗

 

- 

% 

Cooler 1 current limit 

CL1 

∗

 

 

- 

A 

Cooler 1 actual current 

AC1 

 

∗

 

- 

A 

Cooler 1 actual voltage 

AV1 

 

∗

 

- 

V 

Cooler 1 fan voltage (0, 10, 20…100) 

FV1 

∗

 

 

- 

% 

Cooler 2 enable 

CE2 

∗

 

 

- 

- 

Cooler 2 sensor 

CS2 

∗

 

 

- 

- 

Cooler 2 current (set current in %) 

CC2 

 

∗

 

- 

% 

Cooler 2 current limit 

CL2 

∗

 

 

- 

A 

Pilot laser enable 

PLE 

∗

 

 

- 

- 

Pilot laser power 

PLP 

∗

 

 

- 

% 

Summary of Contents for ldc1000

Page 1: ...MANUAL LDC1000 Valid from S N 1122 Nov 2012 Rev 9 1 Laser Diode Controller LDC1000 Operating Instructions ...

Page 2: ...2 ...

Page 3: ...Instrument switch on display menu 11 4 3 2 LASER Menu 12 4 3 3 TIMING Menu 13 4 3 4 EXT INPUTS Menu 13 4 4 Thermoelectric cooler controller 14 4 4 1 TEMPERATURE Menu 14 4 4 2 COOLER Menu 15 4 5 Instrument settings 17 4 5 1 PILOT LASER Menu 17 4 5 2 CALIBRATION Menu 17 4 5 3 CONFIG Menu 17 4 5 4 Interlock 17 4 6 Error Messages 18 5 Connectors pin out 20 5 1 Laser diode 21 5 2 Thermoelectric cooler ...

Page 4: ... to a socket outlet with a protective earth contact Any interruption of the grounding can result in personal injury This instrument must be used under normal conditions and as specified otherwise the protection provided by the instrument could be impaired Always replace blown fuses with the same rating and acting speed ESD Electrostatic discharge ESD on or near the connectors can damage electronic...

Page 5: ...for normal operation and its statements Average radiant power at max rep frequ Po Peak radiant power Pp Pulse width t Max pulse repetition frequency F Wavelength laser radiation λ LASER RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS 4 LASER PRODUCT EN 60825 1 94 Po 50W Pp 100W t 1ms F 500Hz λ 808nm ...

Page 6: ...itor AC Power Cable Manual Optional Heat sink air cooled including cables for connecting the laser diode Laser diode mounted on heat sink Second cooler controller board 5V 3A max 15W for driving a second heat sink LD cable for connecting a laser diode Heat sink cable for connecting a heat sink Sensor cable for connecting sensors Short circuit bridge for the connector at the cable for the laser dio...

Page 7: ...at constant temperature The heatsink consists of a heat spreader on which the laser diode is mounted several peltier elements for heat transportation and a large heatsink profile with fans for sufficient air flow The unit consists of several modules The heart is a microprocessor based central unit which controls all other power units and provides the link to the display keyboard and the PC interfa...

Page 8: ...rovided cable as described in the section Connectors pin out Plug in the cable to the connector labeled Laser at the rear panel of the instrument Fix the connector with the locking ring Note The instrument must be turned off before the cable is plugged in ESD Electrostatic discharge ESD on or near the connectors can damage electronic devices inside the instrument Personnel should touch the metal f...

Page 9: ...perating instructions before using this instrument together with a laser diode 4 1 Elements of the instrument at the front panel 1 Display 2 Keys for setting instrument Up Down Left Right Enter 3 Laser diode on indicator yellow 4 Key for turning on laser diode 5 Rotary knob for setting laser diode current and various settings within the menus 6 Power on indicator green 7 Power switch mains 8 Conne...

Page 10: ...ine 3 Connector for Serial Interface RS232 4 Connector for Interlock Pilot Laser optional and Power Monitor optional 5 Connector for Temperature Sensors and Cooler 2 optional 6 Connector for laser diode 7 Connector for Cooler 1 Heat Sink thermoelectric cooler 1 temperature sensor 1 fan ...

Page 11: ... laser diode current and the calibration points see menu calibration Above in the middle it shows the measured laser diode temperature T1 and the temperature of a second cooler T2 optional I1 is the current of cooler 1 means heating current and cooling current On the right there is the menu By pressing the Up or Down key the menu will be changed Below left the parameters of selected menu will be s...

Page 12: ...he calibration points see menu calibration After changing you must not confirm with the Enter key The calculated laser current will be shown immediately on position set laser current The optical power can also be varied when the laser diode is turned on In this case the calculated laser current is applied to the laser diode immediately Laser Mode The operational mode should only be changed when th...

Page 13: ...f the maximum applied current to the laser diode In order not to distort the analogue modulated laser light pay attention not to exceed the valid analogue modulation signal level according to the transfer function for the current The laser diode should be turned on with the Laser key 4 prior to the external inputs Change the input setting between ENABLE and DISABLE with the Rotary knob Confirm the...

Page 14: ...ser diode is heated up instead of cooled down In this case the polarity of the thermoelectric cooler referred to the pin out as shown in the section Connectors pin out has to be changed Simply change the connection of the two leads of the thermoelectric cooler even if the occurring labelling Plus to Minus doesn t match obviously After this change the measured temperature should approach the desire...

Page 15: ... speeds up the settling time of the control loop but with the first the controller might oscillate and with the latter there might be a permanent difference between the actual temperature and the desired temperature Due to the large heat capacity and heat load of high power laser diodes and the needed heatsinks it takes some minutes until a stable operating point is reached 4 4 2 COOLER Menu The L...

Page 16: ...et from 0 3A Always set the current limit to the maximum current value which can be found in the data sheet of the heat sink Setting the appropriate current limit protects the peltier elements from being overloaded electrically Note The set limit acts in both direction E g current limit 2 5A means a current range 2 5A 2 5A Confirm the selection with the Enter key The desired current limit is store...

Page 17: ... P2 55W Note The deviations from the correct value can increase with distance from the measured value Confirm the selection with the Enter key The desired value is stored permanently in a non volatile memory even when the instrument is switched off Power Monitor If the laser diode is provided with a power monitor photo diode the power monitor voltage will be shown So the calibrating can be made wi...

Page 18: ...ge must be confirmed by pressing the Enter key After the Laser Diode Controller detects the temperature sensor again the temperature controller starts working again according to the parameters as before the error occurred The laser diode must be turned on again by pressing the Laser key If the error is still present the error message appears again after the Laser key is pressed Remarks The error c...

Page 19: ...ing messages appears on the display Case Temperature error If the case temperature falls below 0 C or exceeds 50 C the laser diode and the thermoelectric coolers are turned off immediately The following message appears on the display The second error can be caused by defect case fan blocked ventilation slots at the bottom or by to high ambition temperature Controller Unit error If the controller d...

Page 20: ...de within microseconds in a unrecoverable way Laser diodes are extremely sensitive to electrostatic discharge Follow the instructions supplied with the laser diode very carefully The instrument must be turned off before making the connection to the output for the laser diode the thermoelectric controller and the temperature sensor LASER ELECTRONICS is not responsible for any damage arising from a ...

Page 21: ...d at the device The connector for the laser diode 5 is located at the rear panel of the instrument and it is a male type The pin out is shown when facing the connector male mounted to the rear panel directly Pin number Designation Wire Colour 1 5 6 Laser diode anode plus red 2 4 7 Laser diode cathode minus black or brown 3 not connected n c For best performance some pins have the same designation ...

Page 22: ...nnector mounted to the rear panel directly Pin number Designation Wire Colour 1 Thermoelectric cooler 1 Peltier minus blue 2 Thermoelectric cooler 1 Peltier plus red 3 Temperature sensor 1 type NTC white 4 Temperature sensor 1 type NTC grey 5 Fan plus brown 6 Fan minus black Center Pin Earth green yellow The green yellow lead earth is connected to the base plate of the heatsink do not connect it t...

Page 23: ...ooting After preparing the connection of the thermoelectric cooler and the temperature sensor according to the section Connector pin out and switching on the Laser Diode Controller it might happen that the temperature controller doesn t seem to control the temperature i e the measured temperature doesn t approach the desired temperature after some time or the laser diode is heated up instead of co...

Page 24: ... the interlock loop is closed The interlock is prior to the Laser key at the front panel If the interlock loop is opened the laser diode is immediately turned off and a error message appears on the display The laser diode can only be turned on again by closing the interlock loop The Laser Diode Controller comes with a Dummy connector D Sub 15 which provides the interlock loop When realizing the in...

Page 25: ... P I curve 5 5 Serial interface The connector for the serial interface 2 is located at the rear panel of the instrument The instrument must be turned off before making the connection The connector at the rear panel is a D Sub 9 male 5 1 9 6 The pin out is shown when facing the connector mounted to the rear panel directly Pin number Designation Remark 2 RXD receive galvanically isolated In Output 3...

Page 26: ...ation to and from the Laser Diode Controller Write keyword set Read keyword get These keywords are followed by a command separated by a space Some commands require the additional input of a parameter and maybe also a unit Writing a command set ccc Enter e g Turning on or turning off the laser diode depending on the condition before the command was sent out toggle function set LAS Enter Writing a c...

Page 27: ...2 P2I A Power Monitor POM V Laser current limit LCL A Analog input enable AIE Trigger input enable TIE Actual temperature cooler 1 AT1 C Set temperature cooler 1 ST1 C Upper temperature limit cooler 1 UT1 C Lower temperature limit cooler 1 LT1 C P control loop parameter cooler 1 PV1 I control loop parameter cooler 1 IV1 D control loop parameter cooler 1 DV1 Actual temperature cooler 2 AT2 C Set te...

Page 28: ...AS The command for setting the condition turning on or turning off of the laser diode has a toggle function Each time the command set LAS is sent out the condition of the laser diode changes For example if the laser diode is presently turned off as for example when the Laser Diode Controller is just switched on with the Power switch the laser diode will be turned on when the command set LAS is sen...

Page 29: ...erature to low 0 C 14 Case temperature to high 50 C Note If an error occurs the error status keep its value until the device receive the error reset command set ERR 0 Notation for the format of the transfer protocol The keywords and the commands can be written either in lower case or upper case We used lower cases for the keywords and upper cases for the commands right here The keywords the comman...

Page 30: ...pm Long Term Stability 24hr 75 ppm Repetition Rate 0 100 Hz Pulse Width 5 ms Rise Fall Time 2ms 10 90 of max current Analog Modulation Input BNC connector 0 5 V 1 kΩ Transfer function 20 A V up to 70 A max laser current 40 A V above 70 A max laser current Bandwidth 0 100 Hz Trigger Input BNC connector TTL level High U 2 4 V Low U 0 8 V Output BNC connector TTL level High U 2 4 V Low U 0 8 V Transf...

Page 31: ...tive Humidity operating 30 70 Weight 11 1 kg Dimensions 465 x 150 x 500 W x H x D mm3 Notes The risetime the falltime and the pulsewidth may be prolonged by long cables between the power supply and the laser diode The signal ground shielding of the BNC connectors of the trigger input the trigger output and the analogue modulation input BNC connector are isolated from the chassis ground earth Atten...

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