THORLABS LDM405 Bedienungsanleitung

LDM405, LDM635, LDM670,

LDM785, LDM850, LDM1550

Laser Diode Modules

User Guide

LDM Series Laser Diode Modules

Table of Contents

Chapter 1Warning Symbol Definitions ...........................................1

Chapter 2Safety.................................................................................2

2.1.LaserSafety...................................................................3

Chapter 3Description........................................................................4

Chapter 4Operation...........................................................................5

4.1.NormalOperationandUse............................................5

4.2.MakingtheSafetyInterlockConnections.......................7

Chapter 5Specifications ...................................................................8

5.1.Drawing.........................................................................9

Chapter 6Declaration of Conformity .............................................10

Chapter 7Regulatory.......................................................................11

Chapter 8Thorlabs Worldwide Contacts.......................................12

LDM Series Laser Diode Modules Chapter 1: Warning Symbol Definitions

Page 1 Rev G, September 18, 2017

Chapter 1 Warning Symbol Definitions

Below is a list of warning symbols you may encounter in this manual or on your

device.

Symbol Description

Direct Current

Alternating Current

Both Direct and Alternating Current

Earth Ground Terminal

Protective Conductor Terminal

Frame or Chassis Terminal

Equipotentiality

On (Supply)

Off (Supply)

In Position of a Bi-Stable Push Control

Out Position of a Bi-Stable Push Control

Caution: Risk of Electric Shock

Caution: Hot Surface

Caution: Risk of Danger

Warning: Laser Radiation

Caution: Spinning Blades May Cause Harm

LDM Series Laser Diode Modules Chapter 2: Safety

11837-D02 Page 2

Chapter 2 Safety

Precautions of a general nature should be gathered here. Wherever possible,

however, safety warnings, cautions, and notes should only appear immediately

before the instructions to which they apply (versus being listed in this section).

WARNING

This unit must not be operated in explosive environments. Do not operate in wet

or damp conditions. Do not obstruct the air-ventilation slots in the housing!

WARNING

Avoid Exposure – Laser Radiation Emitted from apertures.

WARNING

Mobile telephones, cellular phones or other radio transmitters should not to be

used within the range of three meters of this unit since the electromagnetic field

intensity may exceed the maximum allowed disturbance values according to

EN50082-1.

This device can only be returned when packed into the complete original

packaging, including all packing inserts. If necessary, ask for a replacement

package.

The maximum USB and BNC cable length is 3 meters in order to avoid a

susceptibility to RF interference according to IEC61000-4-3.

Note: If equipment is used in a manner not specified by the manufacturer, the

protection provided by the equipment may be impaired.

Complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to

laser notice no. 50, dated 5/27/01.

LDM Series Laser Diode Modules Chapter 2: Safety

Page 3 Rev G, September 18, 2017

2.1. Laser Safety

The LDM series of lasers are rated in the 1, 3R, and 3B Laser Safety Class.

According to Laser Institute of America: A Class 3B laser is hazardous if the eye

is exposed directly, but diffuse reflection such as from paper or other matte

surfaces are not harmful. Class 3R levels of laser radiation are considered to be,

depending upon the irradiance, either an acute intrabeam viewing hazard or

chronic viewing hazard, and an acute viewing hazard if viewed directly with optical

instruments. Class 1 lasers are very low risk and "safe under reasonably

foreseeable use". Protective eyewear is typically required where direct viewing of

a class 3R and 3B laser beam may occur. Class 3B lasers must be equipped with

a key switch and a safety interlock.

According to the revised ANSI Z136.1 Safe Use of Lasers, laser area warning

signs should be posted around Class 3 laser areas and are required to be posted

around all Class 3B and 4 laser areas. NOTICE signs are required for Class 3B

and Class 4 lasers during maintenance, servicing, and similar situations.

LASER RADIATION

CLASS 1 LASER PRODUCT

1520 - 1580 nm <5 mW

LASER RADIATION

AVOID DIRECT EYE EXPOSURE

CLASS 3R LASER PRODUCT

395 – 650 nm <5 mW

LASER RADIATION

AVOID EXPOSURE TO THE BEAM

CLASS 3B LASER PRODUCT

650 – 860 nm <5 mW

LDM Series Laser Diode Modules Chapter 3: Description

11837-D02 Page 4

Chapter 3 Description

The LDM Series of compact laser sources are well suited to benchtop optical

experiments. The LDM Series modules come in six wavelength versions: 405, 635,

670, 785, 850, and 1550 nm. The Ø1.40" by 5.8" housing contains a laser diode,

collimating lens, and automatic power control circuit.

Each LDM module includes a built in shutter and SM1 internal thread for mounting

with an extensive range of opt mechanical devices from lens tubes to lens mounts.

The LDM module can easily be mounted to any optical table using one of our

C1502, C1503, or VC3 V-groove mounts.

Besides the mechanical shutter, the module also features a remote interlock

connection and key-lock power switch. The laser module has an enable/disable

toggle switch, laser on indicator LED, and power adjustment pot on the top for easy

access. The power can be adjusted from 0 to full power (laser specific, see the

specifications section for more information).

LDM Series Laser Diode Modules Chapter 4: Operation

Page 5 Rev G, September 18, 2017

Chapter 4 Operation

CAUTION!

Always observe proper Laser safety when operating this unit.

4.1. Normal Operation and Use

The unit should be located on a solid, dry working surface. If preferred, the unit

can be secured to a standard optical breadboard using Thorlabs C1502, C1503,

or VC3 V-groove mounts. For best performance, the unit should be oriented with

its vent holes and cooling slots facing up.

1. If not already done, move the output shutter lever to the CLOSED position.

Figure 1 Front View of LDM

2. With the key-lock switch set to the 0 (Off) position, connect the power supply

to the LDM by plugging the DC Jack into the DC IN socket on the end cap

of the module. Plug the AC connector of the power supply into a suitable

mains socket.

3. Make sure the interlock shorting screw is in place. If using a remote

interlock, see the next section for instructions on how to set up the remote

interlock.

Shutter Control

Knob

Laser Aperture

LDM Series Laser Diode Modules Chapter 4: Operation

11837-D02 Page 6

4. Turn the key-lock switch to the l (ON) position. The green LED will blink

slowly.

Figure 2 Rear Control View of LDM

5. Momentarily press the Enable switch. The green LED will blink more quickly

for approximately 5 seconds and then remain on solid. At that point the laser

will turn on.

6. Open the output shutter by moving the shutter lever to the OPEN position.

7. The output power can be adjusted from roughly the laser threshold current

to the full output power of the laser module by turning the PWR ADJ screw

using a small screwdriver. Clockwise rotation increases the output power.

Figure 3 Top View, Close Up of Controls

8. Pressing the Enable switch will turn off the laser.

9. Turning the Key-lock switch to the 0 (Off) position will also turn off the laser

output. The enable button will need to be pressed to enable the laser after

the Key-lock is returned to the l (ON) position.

10. Disconnecting the Interlock pin will also turn off the laser.

DC power

supply in

Key-lock switch currently

in the off position

Interlock control

with shorting

device

Power adjustment pot

(recessed to prevent

accidental changes)

Laser Enabled

Indicator LED

Enable/disable toggle

switch

LDM Series Laser Diode Modules Chapter 4: Operation

Page 7 Rev G, September 18, 2017

4.2. Making the Safety Interlock Connections

The LDM Series is equipped with a remote interlock connector located on the end

cap. In order to enable the laser driver, a short circuit must be applied across the

terminals of the remote interlock connector. In practice this connection is made

available to allow the user to connect a remote actuated switch to the connector

(i.e. an open door indicator). The switch (which must be normally open) has to be

closed in order for the unit to be enabled. Once the switch is in an open state, the

laser diode must automatically shutdown.

All units shipped from Thorlabs are configured with a shorting device installed in

the Interlock connector. If you are not going to use this feature then you can leave

the shorting device installed and the unit will operate normally as described in the

procedures in this manual. If you wish to make use of the Interlock feature you will

need to acquire the appropriate connector mate and wire it your remote interlock

switch. Next, remove the shorting device by unscrewing it from the output and

install the connector into the Interlock output.

The Interlock output only accepts a 2.5 mm mono phono jack. This connector is

readily available at most electronic supply stores.

The electrical specifications for the Interlock output are as follows:

Type of Mating Connector: 2.5 mm mono phono jack

Connector Polarity: Tip is positive, barrel is ground

Interlock Switch Requirements: Must be N.O. dry contacts

Figure 4 Remote Interlock Connector

CAUTION!

Under no circumstances should any external voltages be applied to the

Interlock output

LDM Series Laser Diode Modules Chapter 5: Specifications

11837-D02 Page 8

Chapter 5 Specifications

Item # LDM405 LDM635 LDM670

Wavelength, Typical 405 nm 635 nm 670 nm

Wavelength, Min/Max 395 - 415 nm 625 - 645 nm 660 - 678 nm

Beam Diametera3.0 mm x 5.0 mm 3.0 mm x 5.0 mm 3.2 mm x 3.4 mm

Power, Adjustableb4.0 mW 4.0 mW 5.5 mW

Item # LDM785 LDM850 LDM1550

Wavelength, Typical 785 nm 850 nm 1550 nm

Wavelength, Min/Max 776 - 800 nm 840 - 860 nm 1520 - 1580 nm

Beam Diametera 2.4 mm x 3.4 mm 3.5 mm x 4.4 mm 2.6 mm x 3.0 mm

Power, Adjustableb20 mW 20 mW 4.5 mW

Common Specifications

Stability, Short Term Drift (30 min) 0.01 dB

Stability, Long Term Drift (24 hrs) 0.1 dB

Operating Temperature 10 to 40 °C

Storage Temperature 5 to 50 °C

Power Supply @ ±10% (Included)

100 – 240 VAC, 0.48 A

50 – 60 Hz

Output: 9 VDC @ 2.2 A

aMeasured 3 m from module. Beam shape is elliptical

bThe maximum power is given for an operating temperature of 25 °C. When operated at a temperature

other than this, the maximum output will vary.

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