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Operation and Service Manual
Laser Diode Controllers
LDC500 Series
Stanford Research Systems
Revision 4.3 February 23, 2016•
Contents
General Information v
Safety and Preparation for Use . . . . . . . . . . . . . . . . v
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Specifications viii. . . . . . . . . . . . . . . . . . . . . . . . . .
1 Overview 1 – 1
1.1 How to use this Manual . . . . . . . . . . . . . . . . . 1 – 2
1.2 Introduction to the Instrument . . . . . . . . . . . . . 1 – 2
1.2.1 Instrument architecture . . . . . . . . . . . . . 1 – 2
1.2.2 Grounding . . . . . . . . . . . . . . . . . . . . . 1 – 5
1.3 Features and controls . . . . . . . . . . . . . . . . . . . 1 – 6
1.4 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 6
1.4.1 Power entry module . . . . . . . . . . . . . . . 1 – 6
1.4.2 Grounding terminal . . . . . . . . . . . . . . . 1 – 6
1.4.3 Turning on power . . . . . . . . . . . . . . . . 1 – 6
1.4.4 Hardware reset . . . . . . . . . . . . . . . . . . 1 – 8
1.5 Cable Interfaces . . . . . . . . . . . . . . . . . . . . . . 1 – 8
1.5.1 Modulate . . . . . . . . . . . . . . . . . . . . . 1 – 8
1.5.2 Sync . . . . . . . . . . . . . . . . . . . . . . . . 1 – 8
1.5.3 Laser diode . . . . . . . . . . . . . . . . . . . . 1 – 8
1.5.4 TEC . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 9
1.5.5 Remote interface connections . . . . . . . . . . 1 – 10
1.6 User Interface . . . . . . . . . . . . . . . . . . . . . . . 1 – 10
1.6.1 Hard controls . . . . . . . . . . . . . . . . . . . 1 – 10
1.6.2 Dedicated displays . . . . . . . . . . . . . . . . 1 – 11
1.6.3 Alphanumeric display . . . . . . . . . . . . . . 1 – 11
1.6.4 Local Remote/. . . . . . . . . . . . . . . . . . . 1 – 13
2 Getting Started 2 – 1
2.1 Preparation for Use . . . . . . . . . . . . . . . . . . . . 2 – 2
2.1.1 Power and ground . . . . . . . . . . . . . . . . 2 – 2
2.1.2 Laser diode connections . . . . . . . . . . . . . 2 – 2
2.1.3 TEC module connections . . . . . . . . . . . . 2 – 2
2.1.4 Checking wiring . . . . . . . . . . . . . . . . . 2 – 3
2.1.5 Turning on power . . . . . . . . . . . . . . . . 2 – 5
i
ii Contents
2.2 Operating the TEC controller . . . . . . . . . . . . . . 2 – 6
2.2.1 Sensor configuration . . . . . . . . . . . . . . . 2 – 6
2.2.2 TEC settings . . . . . . . . . . . . . . . . . . . . 2 – 7
2.2.3 Verify TEC wiring polarity . . . . . . . . . . . 2 – 8
2.2.4 Auto-tuning . . . . . . . . . . . . . . . . . . . . 2 – 9
2.2.5 TEC operation in CT mode . . . . . . . . . . . 2 – 10
2.2.6 Thermal runaway . . . . . . . . . . . . . . . . . 2 – 10
2.2.7 TEC operation in CC mode . . . . . . . . . . . 2 – 11
2.2.8 TEC limit values . . . . . . . . . . . . . . . . . 2 – 11
2.2.9 Monitoring the TEC . . . . . . . . . . . . . . . 2 – 12
2.2.10 Configuring TEC trip-offs . . . . . . . . . . . . 2 – 12
2.3 Operating the Laser Diode Driver . . . . . . . . . . . . 2 – 14
2.3.1 Laser driver configuration . . . . . . . . . . . . 2 – 14
2.3.2 Laser settings . . . . . . . . . . . . . . . . . . . 2 – 15
2.3.3 Operating the laser in CC mode . . . . . . . . 2 – 15
2.3.4 Operating the laser in CP mode . . . . . . . . . 2 – 16
2.3.5 Modulation . . . . . . . . . . . . . . . . . . . . 2 – 17
2.3.6 Monitoring the LD . . . . . . . . . . . . . . . . 2 – 17
2.3.7 Optical power calibration . . . . . . . . . . . . 2 – 18
2.3.8 Configuring LD trip-offs . . . . . . . . . . . . . 2 – 18
2.4 Factory Default Settings . . . . . . . . . . . . . . . . . 2 – 19
3 Menus 3 – 1
3.1 Menu Navigation . . . . . . . . . . . . . . . . . . . . . 3 – 2
3.2 Laser Menus . . . . . . . . . . . . . . . . . . . . . . . . 3 – 2
3.2.1 LD settings . . . . . . . . . . . . . . . . . . . . 3 – 2
3.2.2 LD monitor . . . . . . . . . . . . . . . . . . . . 3 – 4
3.2.3 LD configuration . . . . . . . . . . . . . . . . . 3 – 5
3.3 TEC Menus . . . . . . . . . . . . . . . . . . . . . . . . 3 – 7
3.3.1 TEC settings . . . . . . . . . . . . . . . . . . . . 3 – 7
3.3.2 TEC monitor . . . . . . . . . . . . . . . . . . . 3 – 8
3.3.3 TEC configuration . . . . . . . . . . . . . . . . 3 – 9
3.4 Other Menus . . . . . . . . . . . . . . . . . . . . . . . . 3 – 12
3.4.1 Utility . . . . . . . . . . . . . . . . . . . . . . . 3 – 13
3.4.2 Other messages . . . . . . . . . . . . . . . . . . 3 – 14
4 Remote Operation 4 – 1
4.1 Index of Common Commands . . . . . . . . . . . . . . 4 – 2
4.2 Alphabetic List of Commands . . . . . . . . . . . . . . 4 – 6
4.3 Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 – 10
4.3.1 Interface configuration . . . . . . . . . . . . . . 4 – 10
4.3.2 Buffers . . . . . . . . . . . . . . . . . . . . . . . 4 – 10
LDC500 Series Laser Diode Controllers
Contents iii
4.4 Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 10
4.4.1 Connection example . . . . . . . . . . . . . . . 4 – 11
4.5 Commands . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 16
4.5.1 Command syntax . . . . . . . . . . . . . . . . . 4 – 16
4.5.2 Notation . . . . . . . . . . . . . . . . . . . . . . 4 – 17
4.5.3 Examples . . . . . . . . . . . . . . . . . . . . . 4 – 17
4.5.4 Laser limit commands . . . . . . . . . . . . . . 4 – 18
4.5.5 Laser setting commands . . . . . . . . . . . . . 4 – 20
4.5.6 Laser monitor commands . . . . . . . . . . . . 4 – 22
4.5.7 Laser configuration commands . . . . . . . . . 4 – 24
4.5.8 Laser trip-o commandsff. . . . . . . . . . . . . 4 – 29
4.5.9 TEC limit commands . . . . . . . . . . . . . . . 4 – 31
4.5.10 TEC setting commands . . . . . . . . . . . . . 4 – 33
4.5.11 TEC monitor commands . . . . . . . . . . . . . 4 – 35
4.5.12 TEC configuration commands . . . . . . . . . 4 – 36
4.5.13 TEC sensor commands . . . . . . . . . . . . . . 4 – 40
4.5.14 TEC trip-o commandsff. . . . . . . . . . . . . 4 – 45
4.5.15 Interface commands . . . . . . . . . . . . . . . 4 – 46
4.5.16 Status commands . . . . . . . . . . . . . . . . . 4 – 52
4.6 Status Model . . . . . . . . . . . . . . . . . . . . . . . . 4 – 57
4.6.1 Status byte (SB) . . . . . . . . . . . . . . . . . . 4 – 58
4.6.2 Service request enable (SRE) . . . . . . . . . . 4 – 59
4.6.3 Standard event status (ESR) . . . . . . . . . . . 4 – 59
4.6.4 Laser diode condition (LDCR) . . . . . . . . . 4 – 60
4.6.5 TEC controller condition (TECR) . . . . . . . . 4 – 61
5 Error Messages 5 – 1
5.1 Laser Diode Driver Messages . . . . . . . . . . . . . . 5 – 2
5.1.1 Interlock . . . . . . . . . . . . . . . . . . . . . . 5 – 2
5.1.2 Transitions with high photodiode current . . . 5 – 2
5.1.3 Transitions with limited laser current . . . . . 5 – 2
5.1.4 Transitions locked out . . . . . . . . . . . . . . 5 – 2
5.1.5 Responsivity . . . . . . . . . . . . . . . . . . . 5 – 3
5.1.6 Photodiode current overflow . . . . . . . . . . 5 – 3
5.1.7 Responsivity underflow . . . . . . . . . . . . . 5 – 3
5.1.8 Responsivity overflow . . . . . . . . . . . . . . 5 – 4
5.1.9 Trip-offfrom TEC . . . . . . . . . . . . . . . . . 5 – 4
5.1.10 Trip-o from temperatureff. . . . . . . . . . . . 5 – 4
5.2 TEC Messages . . . . . . . . . . . . . . . . . . . . . . . 5 – 4
5.2.1 Autotune . . . . . . . . . . . . . . . . . . . . . . 5 – 4
5.2.2 No loop control . . . . . . . . . . . . . . . . . . 5 – 5
5.2.3 Transitions locked out . . . . . . . . . . . . . . 5 – 5
LDC500 Series Laser Diode Controllers
General Information
Safety and Preparation for Use
Dangerous voltages, capable of causing injury or death, are
WARNING
present in this instrument. Do not remove the product covers
or panels. Do not apply power or operate the product without
all covers and panels in place.
AC line voltage
The LDC500 Series Laser Diode Controllers operate from a 100 V,
120 V, 220 V, or 240 V nominal AC power source having a line fre-
quency of 50 Hz or 60 Hz. Before connecting the power cord to a
power source, verify that the LINE VOLTAGE SELECTOR, located
in the rear panel power-entry module, is set so that the correct AC
line voltage value is visible.
The LDC500 Series Laser Diode Controllers will be damaged if oper-
CAUTION
ated with the LINE VOLTAGE SELECTOR set for the wrong AC line
voltage, or if the wrong fuses are installed. Verify that the correct
line fuses are installed before connecting the line cord. Fuse size is
5MF “fast blow” ( 5 20 mm). For 100 V 120 V, use 4 A fuses; for× /
220 V 240 V, use 2 A fuses./
Line cord
The LDC500 Series Laser Diode Controllers have a detachable, three-
wire power cord for connection to the power source and to a protec-
tive ground. The exposed metal parts of the instrument are connected
to the outlet ground to protect against electrical shock. Always use
an outlet which has a properly connected protective ground.
Service
The LDC500 Series Laser Diode Controllers do not have any user
serviceable parts inside. Refer service to a qualified technician.
Do not install substitute parts or perform any unauthorized modi-
fications to this instrument. Contact the factory for instructions on
how to return the instrument for authorized service and adjustment.
v
vi General Information
Symbols you may Find on SRS Products
Symbol Description
Alternating current
Caution - risk of electric shock
Frame or chassis terminal
Caution - refer to accompanying documents
Earth (ground) terminal
Battery
Fuse
On (supply)
Off (supply)
LDC500 Series Laser Diode Controllers
viii General Information
Specications
All performance specications after 1 hour warm-up at 25 ◦C ambi-
ent.
Laser diode current source
LDC500 LDC501 LDC502 Units
Output current Range, high 0–100 0–500 0–2000
low 0–50 0–250 0–1000 mA
Setpoint resolution 1 10 100 Aμ
Accuracy 10 50 200 A± ± ± μ
DC output impedance 1 M minΩ
Thermal drift 10 ppm± /◦C max
Short-term stability (1 hr) 5 ppm FS±
Long-term stability (24 hr) 15 ppm FS±
Noise density [1]
high range 0.7 3.5 12.5
low range 0.4 1.8 6.3 nA/√Hz typ.
Wide band noise [2]
high range, high BW 0.9 4.5 25
high range, low BW 0.6 1.5 5.0
low range, high BW 0.5 2.3 10
low range, low BW 0.3 1 3.5 A rms maxμ
Power fail transient [3] 1 1 5 mA max
Compliance voltage Range 0.1–10 V
Resolution 10 mV
Accuracy 0 2 V+.
Output current limit Range, high 0–100 0–500 0–2000
low 0–50 0–250 0–1000 mA
Resolution 10 10 100 Aμ
Accuracy 100 100 400 A± ± ± μ
LDC500 Series Laser Diode Controllers
General Information ix
LDC500 LDC501 LDC502 Units
Analog modulation Input range 10 to 10 V−+
Input impedance 2 k typ.Ω
Transfer function
high range, CC mode 10 50 200
low range, CC mode 5 25 100 mA V/
CP mode 500 500 1000 A Vμ /
Modulation bandwidth ( 3 dB)[4]−
high BW, CC mode DC–1.0 0.8 MHz
low BW, CC mode DC–10 kHz
high BW, CP mode DC–5 kHz
low BW, CP mode DC–100 Hz
Photodiode feedback Bias voltage 0–5 V
Photodiode current 0–5000 0–10,000 Aμ
Setpoint resolution [5] 0.1 Aμ
Accuracy [5] 3 6 A± ± μ
Trigger output TTL pulse width (negative) 10 sμ
Delay [6] 0.004–1000 s
Measurement & display LD current resolution 1 10 100 Aμ
accuracy 200 ppm FS±
PD current resolution 0.1 Aμ
accuracy 200 ppm FS±
LD voltage resolution 1 mV
accuracy 300 ppm FS±
Conditions:
[1] Measured electrically at 1 kHz through a 50 load (LDC500), 10Ω Ω
load (LDC501), 4 load (LDC502) .Ω
[2] Measured electrically with an RMS meter from 10 Hz to 1 MHz,
through a 50 load (LDC500), 10 load (LDC501), 4 loadΩ Ω Ω
(LDC502).
[3] Output current change, measured with an oscilloscope, upon remov-
ing AC power cord.
[4] Bandwidth can be a ected by cable and load parameters.ff
[5] In CP control mode.
[6] Delay programmed by the remote command.SYND
LDC500 Series Laser Diode Controllers
General Information xi
Temperature sensors Excitation range 10, 100, 1000 Aμ
Thermistors 0.010 500 kΩ
RTD Pt-100, Pt-1000, and equiv
IC voltage sensors (1 mA bias) LM335 and equiv.
IC current sensors ( 5 V bias) AD590 and equiv.>
Measurement & display Temperature resolution 0.001 ◦C
Thermistor resolution 0.1 Ω
Accuracy [4] 0 0.05±.2 % + Ω
TEC current resolution 1
Accuracy 5 mA±
TEC voltage resolution 1
Accuracy 5 mV±
Conditions:
[1] Accuracy figures represent the uncertainty added by the measure-
ment circuitry inside the instrument. Sensor uncertainty is not in-
cluded, which can add up to 2◦C.
[2] Measured by a monitor thermistor on the TEC stage. The LDC500 is
operated in an environmental chamber between 0◦C and 40 ◦C. The
TEC and heatsink are at room temperature.
[3] Measured output current noise from 10 Hz to 1 MHz.
[4] With 1 mA excitation current
General characteristics
Interface GPIB (IEEE-488.2), RS-232, Ethernet TCP-IP/
Connectors DB9-F (laser diode), DB15-F (TEC),
BNC (modulate in, trigger out)
Power 100 W, 100 V, 120 V, 220 V, 240 V
50 Hz or 60 Hz
Fuse Type 5MF, 5 20 mm, “fast blow”×
4 A (100 V 120 V); 2 A (220 V 240 V)− −
Weight 15 lbs
Dimensions 8 5. W 5× H 15× D
LDC500 Series Laser Diode Controllers
1 Overview
This chapter provides a basic overview of the LDC500 Series Laser
Diode Controllers.
In This Chapter
1.1 How to use this Manual . . . . . . . . . . . . . . . . . 1 – 2
1.2 Introduction to the Instrument . . . . . . . . . . . . . 1 – 2
1.2.1 Instrument architecture . . . . . . . . . . . . . 1 – 2
1.2.2 Grounding . . . . . . . . . . . . . . . . . . . . . 1 – 5
1.3 Features and controls . . . . . . . . . . . . . . . . . . 1 – 6
1.4 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 6
1.4.1 Power entry module . . . . . . . . . . . . . . . 1 – 6
1.4.2 Grounding terminal . . . . . . . . . . . . . . . 1 – 6
1.4.3 Turning on power . . . . . . . . . . . . . . . . 1 – 6
1.4.4 Hardware reset . . . . . . . . . . . . . . . . . . 1 – 8
1.5 Cable Interfaces . . . . . . . . . . . . . . . . . . . . . . 1 – 8
1.5.1 Modulate . . . . . . . . . . . . . . . . . . . . . 1 – 8
1.5.2 Sync . . . . . . . . . . . . . . . . . . . . . . . . 1 – 8
1.5.3 Laser diode . . . . . . . . . . . . . . . . . . . . 1 – 8
1.5.4 TEC . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 9
1.5.5 Remote interface connections . . . . . . . . . . 1 – 10
1.6 User Interface . . . . . . . . . . . . . . . . . . . . . . . 1 – 10
1.6.1 Hard controls . . . . . . . . . . . . . . . . . . . 1 – 10
1.6.2 Dedicated displays . . . . . . . . . . . . . . . . 1 – 11
1.6.3 Alphanumeric display . . . . . . . . . . . . . . 1 – 11
1.6.4 Local Remote/. . . . . . . . . . . . . . . . . . . 1 – 13
1–1
1 – 6 Overview
by resistors R269 and R255) will still allow correct modulation con-
trol with an earth-referenced modulation signal, but it now becomes
more important that the modulation source has a balanced output
impedance. If the modulation source has a 50 output impedanceΩ
(on the center conductor of the BNC), with the outer shield at earth
(low impedance), then a “common-mode” DC error, of the order of
up to 1 mA, may be induced. The user has 4 strategies to avoid this
e ect:ff
1. Keep the laser diode fully oating,
2. Use a oating source for the modulation input,
3. Ensure the modulation source has a low output impedance, or
4. Balance the modulation source impedance.
1.3 Features and controls
The remaining sections in this chapter explains each part of the front
and rear panel of the LDC500. Circled numbers in the left margin
refer to Figure 1.4.
1.4 Power
1.4.1 Power entry module
A rear-panel power entry module contains a standard IEC-C13 power
connector.The power cord shipped with your LDC500 mates with the


14
power entry module, and should match the standard wall sockets for
your locale. The fuse and voltage selector is also in the power entry
block, and must show the correct voltage setting for your location.
See page v for details on fuse and voltage selection.
1.4.2 Grounding terminal
A dedicated chassis ground terminal is adjacent to the power entry
module.


13
1.4.3 Turning on power
Power to the LDC500 is controlled by the front-panel keyswitch. In
order to turn on the instrument,the key must be inserted and rotated


1
clockwise to the “1” position. The key cannot be removed when in
this position.
LDC500 Series Laser Diode Controllers
1.5 Cable Interfaces 1 – 9
pin description
1 Interlock
2 Interlock
3 Chassis ground
4 Laser Cathode Voltage Sense
5 Laser Cathode
6 Photodiode Cathode
7 Photodiode Anode
8 Laser Anode Voltage Sense
9 Laser Anode
Pin 4 and pin 8 are used for 4-wire measurement of the laser diode
bias voltage. If these are left disconnected, the voltage sensing is
performed (through resistors) from pin 5 and pin 9. Be careful that
CAUTION the connection from the LDC500 to your device preserves the wiring
polarity, with pin 5 connecting to the laser diode , and pin 9cathode
connecting to the laser diode .anode
The interlock function requires a low-resistance electrical connection
between pins 1 and 2 for the laser to operate. Neither of these pins
may be allowed to contact ground or any other signal.
See Figure 2.2 in section 2.1.2 for further examples.
1.5.4 TEC
The DB–15 female connector marked “THERMOELECTRIC COOLER”
provides the electrical connection to the TEC and thermometer in


12
the laser assembly. For best performance, the TEC cable should be
an independent, separately-shielded cable assembly from the laser
diode cable.
pin description
1, 2 TEC current terminal (*)+
3, 4 TEC current terminal (*)−
5 shield for TEC current
6 shield for sensor connection
7 Sensor 2-wire +
8Sensor 2-wire −
9 no connection
10 TEC sense+
11 no connection
12 TEC sense−
13 no connection
14 Sensor 4-wire +
15 Sensor 4-wire −
(*): terminals can be switched with commandTPOL
The power current to the TEC module is through pins 1 and 2, re-
LDC500 Series Laser Diode Controllers
1.6 User Interface 1 – 11
During this delay, the indicator will blink back-and-LASER ON
forth. To abort energizing the laser during this time, simply press
the [LASER On O ] button a second time./ ff
1.6.1.2 Laser control mode
The principal control mode of the laser, either CC or CP, is controlled
by the [Current Power] button under the “Laser Diode Control”/
block. When the laser is o , pressing this button toggles between CCff
and CP modes (as shown by the and indicators). When on, theCC CP
user may still switch between control modes by pressing the [Cur-
rent Power] button; however, in this case, a confirmation message/


appears on the display. If the button is not depressed a second time
within 3 s, the request is abandoned.
1.6.1.3 TEC on/off
The [TEC On O ] button, under the “TEC Control” block, toggles/ ff
the TEC current source on and o .There is no delay imposed on thisff


8
action, and the state of the TEC is indicated by the lamp.TEC ON
1.6.1.4 TEC control mode
The principal control mode of the TEC, either CT or CC, is controlled
by the [Temp Current] button under the “TEC Control” block. When/
the TEC is o , pressing this button toggles between CT and CC modesff
(as shown by the and indicators). When the TEC is on, theCT CC
user must confirm the change with a second button press within 3 s.
1.6.2 Dedicated displays
The two primary sections of the LDC500, the LD and the TEC,
each have a large numeric display dedicated to that subsystem’s
“primary” measurement value. For the LD, this is either the laser


4

5
operating current or the photodiode current (or power), when in CC
or CP mode, respectively. For the TEC, this is temperature or resis-
tance, or TEC current. Units and warning indicators are also in the
dedicated display blocks.
1.6.3 Alphanumeric display
All user inputs, and non-primary monitor functions, are handled by
the central alphanumeric display. Control of this display is through


3
LDC500 Series Laser Diode Controllers
1 – 12 Overview
a collection of 7 menus, each of which is selected with a dedicated
front-panel button.
The LD subsystem has three dedicated menu trees: Settings, Mon-
itor, and Configuration. These can be selected by pressing one of


9
the “Parameters” buttons under the “Laser Diode Control” section
of the panel. The TEC has a similar collection of menus, which


8
are selected by pressing the “Parameters” buttons under the “TEC
Control” section of the panel.
A seventh menu tree, Utility, can be selected by pressing the [Util-
ity Local] button./


7
1.6.3.1 Menu navigation
Once a menu tree is selected, individual menu items are navigated
by pressing the [ ] or [ ] buttons in the “Menu” block, just to the


3
right of the alphanumeric display. Note that some menu items are
only visible when the instrument is appropriately configured. To
jump between major menus, press the button associated with the
new menu. For instance, to jump from the LD voltage monitor menu
LD :

to the TEC temperature setpoint menu
!"#
!!!!$
simply press the [Set] button under the “TEC Control” block.
Pressing the [Monitor] button back in the “Laser Diode Control”
block will return to the menu selection previously being visited (in
this case, the LD voltage monitor).
1.6.3.2 Floating-point entry
Setting and Configuration menu items that have continuously-
adjustable parameters can be set using the numeric keypad. Values


10
are not entered until the [Enter] button is pressed. A lamp will blink
above the [Enter] button whenever there is a pending user value that
has not been entered to the instrument. Pressing the [Clear Cancel]/
button, or any menu navigation button, will abandon a non-entered
pending user value.
1.6.3.3 Token entry
Configuration menu items that have a discrete list of selections can
be set using either the numeric keypad or the wheel. List selections
typically include a numeric index followed by a right parenthesis,
LDC500 Series Laser Diode Controllers
1 – 14 Overview
Note that if the [Utility Local] button is pressed when is/REM not
illuminated, the Utility menu tree will be selected.
LDC500 Series Laser Diode Controllers
2–4 Getting Started
1
2
3
4
5
6
7
8
9
+
-
Bias
Interlock
PDCathode
PDAno
de
+
-
VLD
LDAno
de
LDCathode
LDAnodeS
ens
e
LDCathodeS
ense
ILD
IPD
Figure 2.2: Wiring diagram for the Laser Diode. Pin 3 is internally con-
nected to the chassis, and can be used for cable shielding. When
the “dashed” connections are made, VLD is a 4–wire measure-
ment; otherwise, it is a 2–wire measurement.
1
2
3
4
5
+
—
TE+
ITE
6
7
8
9
10
11
12
13
14
15
TESense+
VTE
TE—
TESense—
t
Se
nsor2Wire+
Se
nsor4Wire+
Se
nsor4Wire—
Se
nsor2Wire—
NTC
RTD
+
—
+
—
LM335
LM235
LM135
(10mV/K)
AD5
90
AD5
92
TMP1
7
(1µA/
K)
Excitation
Figure 2.3: Wiring diagram for the TEC module. Pins 5 and 6 are internally
connected to the chassis, and can be used for cable shielding.
When the “dashed” connections are made from pins 10 and 12,
VTE is a 4–wire measurement; otherwise, it is a 2–wire measure-
ment. When the “dashed” connections are made from pins 14
and 15, the temperature sensor is read with a 4–wire measure-
ment; otherwise a 2–wire measurement.
LDC500 Series Laser Diode Controllers
2–6 Getting Started
2.2 Operating the TEC controller
On the front panel, the “TEC Control” block has ve buttons (see
Figure 2.5).
Figure 2.5: The TEC Control block.
With the TEC o , press the [Temp Current] button to toggle betweenff /
CT and CC modes. In CT mode (constant temperature), the TEC
controller will measure the temperature of the stage, and delivers
the proper current to the TEC module to servo the temperature to
a constant value. In CC mode (constant current), the controller de-
livers a constant current to the TEC module, independent of the
temperature reading.
Assuming you have a laser stage with a TEC module and temperature
sensor, select CT mode.
2.2.1 Sensor configuration
Press the [Cong] button to navigate to the TEC conguration menu
tree.
•Press the [ ] button (beside the 2-line text display) repeatedly
to reach the top of the menu tree.
•Choose the appropriate temperature sensor type, from the list:
NTC 10 A, NTC 100 A, NTC 1mA, NTC auto (automatic exci-μ μ
tation current), RTD, LM335, or AD590. For now, we’ll assume
a 10 kΩNTC thermistor sensor. Press [3] (or wheel to the value
3) followed by the [Enter] button.
•Press [ ] to choose the sensor calibration model. For NTC ther-
mistors, the choices are: -model, Steinhart-Hart model, orβ
LDC500 Series Laser Diode Controllers

Product specificaties

Merk: SRS
Categorie: Niet gecategoriseerd
Model: LDC502

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