Stanford Research Systems LDC500 Bedienungsanleitung

Operation and Service Manual

Laser Diode Controllers

LDC500 Series

Stanford Research Systems

Revision 4.3 •February 23, 2016

Certiﬁcation

Stanford Research Systems certiﬁes that this product met its published speciﬁcations at the time

of shipment.

Warranty

This Stanford Research Systems product is warranted against defects in materials and workman-

ship for a period of one (1) year from the date of shipment.

Service

For warranty service or repair, this product must be returned to a Stanford Research Systems

authorized service facility. Contact Stanford Research Systems or an authorized representative

before returning this product for repair.

Information in this document is subject to change without notice.

Stanford Research Systems, Inc.

1290–D Reamwood Avenue

Sunnyvale, CA 94089 USA

Phone: (408) 744-9040 •Fax: (408) 744-9049

www.thinkSRS.com •e-mail: [email protected]

Printed in U.S.A. Document number 9-01640-903

LDC500 Series Laser Diode Controllers

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

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-oﬀcommands ............. 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-oﬀcommands ............. 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-oﬀfromTEC................. 5–4

5.1.10 Trip-oﬀfrom temperature ............ 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

iv Contents

5.2.4 Temperature faults ................ 5–6

5.2.5 Thermal runaway ................. 5–6

5.2.6 Polarity change locked out ........... 5–6

5.3 Other messages ...................... 5–6

5.3.1 Restart ....................... 5–6

6 Accessories 6 – 1

6.1 Cables ........................... 6–2

6.1.1 Laser diode cables ................ 6–2

6.1.2 TEC cables ..................... 6–4

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.

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

General Information vii

Notation

The following notation will be used throughout this manual.

Unless otherwise speciﬁed in the text, LDC500 refers generally to

either the LDC500, LDC501, or LDC502 Laser Diode Controller.

A warning means that injury or death is possible if the instructions

WARNING are not obeyed.

A caution means that damage to the instrument or other equipment

CAUTION is possible.

Typesetting conventions used in this manual are:

•Front-panel buttons are set as [Button].

•Front-panel indicators are set as Overload.

•Remote command names are set as *IDN?.

•Literal text other than command names is set as OFF.

Remote command examples will all be set in monospaced font. In

these examples, data sent by the host computer to the LDC500 are set

as straight teletype font, while responses received by the host

computer from the LDC500 are set as slanted teletype font.

LDC500 Series Laser Diode Controllers

viii General Information

Speciﬁcations

All performance speciﬁcations 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 μA

Accuracy ±10 ±50 ±200 μA

DC output impedance 1 MΩmin

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 μA rms max

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 μA

Accuracy ±100 ±100 ±400 μA

LDC500 Series Laser Diode Controllers

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