Elforlight HPG Series Bedienungsanleitung

HPG Manual.docx 1 12/01/2018

HPG Series Diode Pumped Solid State lasers

Elforlight Ltd

Nene House

Drayton Way

Daventry

Northants

NN11 8EA

Tel +44 1327 300069: Fax +44 1455 552974

www.elforlight.com

HPG Manual.docx 2 12/01/2018

NOTICE

Elforlight Ltd. has made every attempt to ensure that the information in this document is

accurate and complete. Elforlight Ltd. assumes no liability for errors, or for any incidental,

consequential, indirect or special damages, including, without limitation, loss of use, delays or

lost profits or savings, arising from the use of this document, or the product which it

accompanies.

The contents of this manual are subject to change without notice. Please contact the factory to

ensure you have the latest revision of this document before embarking on critical design.

No part of this document may be reproduced or transmitted in any form or by means, electronic

or mechanical, for any purpose without written permission from Elforlight Ltd.

Elforlight Ltd. acknowledges the trademarks of other organizations for their respective

products or services mentioned in this document.

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Contents

1. Basic Operation

1.1 Operation through RS232

1.2 To stop the Laser in normal operation

1.3 To shut down the laser IN EMERGENCY SITUATION ONLY

2. Front Panel

2.1 Keyswitch

2.2 Indicators

3. Rear Panel

3.1 Features

4. System components and features

4.1 Laser head

4.2 Power supply

4.3 Interlock

4.4 Shutter

5. Laser Safety

5.1 Classification

5.2 Emission

5.3 Indicators

5.4 External interlock

5.5 Beam stop

5.6 Safety precaution during laser operation

6. Warning Labels

Figures:

1. Front panel

2. Rear panel

3. Laser head

4. Power supply front view

5. Power supply rear view

6. HyperTerminal example

Appendix 1: Preparing PC for operation

Appendix 2: RS 232 control

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HPG Series Diode Pumped Solid State Laser

1. Basic Operation

The HPG Series Lasers are microprocessor controlled, and designed for simple,

user friendly operation from most PC type computers through the serial (RS232)

port.

Ensure that the Laser Head is connected correctly to the Power Supply by means of

the umbilical cable supplied.

NB: Care should be taken to correctly align the connector before pushing home and

turning the locking ring

Connect the mains supply of the appropriate voltage to the Power Supply by the

connector on the rear panel.

For HPG 532nm lasers connect the two pin plastic PZT connector at the power

supply rear panel and laser head.

Connect the 9-way serial cable supplied to the RS232 D-connector on the rear of the

Power Supply, and the USB serial converter (supplied).

1.1 Operation through RS232

Before laser operation it is necessary to follow the set up

procedure for your PC as shown in appendix 1

The connection detail for the RS232 cable is given later in this manual.

Ensure that the external interlock circuit is closed, either by use of the supplied

shorted connector (temporarily for test only), or via a user supplied door or

enclosure protection circuit.

Boot the computer, if not already running, and run a dumb terminal program such as

HYPERTERMINAL (supplied with Win 98/ME/2000/XP) and accessible from the

Windows Start Menu and following:

Programs > Accessories > Communication > HyperTerminal

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Turn the front panel key switch to the “On” position.

By default, the laser starts up with parameters set as follows:

* Control by RS232 mode

* Interlock latch is reset (operation possible if external interlock contacts are closed)

* Diode current(s) set to zero

* Diode and oven temperatures controlling

Shutter closed

WAIT AT LEAST 5 MINUTES FOR THE SYSTEM TO REACH

THERMAL EQUILIBRIUM.

Enter the required commands through the dumb terminal program, i.e.

HYPERTERMINAL. As a minimum, the diode current(s) must be set and the shutter

opened. For example to run the laser with a diode current of 50%:

ON (Laser current ramps to IIDLE setting)

ISET 50 (sets current of diode to 50% of ILIM)

SHUTTER 1 (opens shutter)

1.2 To stop the Laser in normal operation

Use:

SHUTTER 0 ( closes shutter)

ISET 0 (Ramps current down to 0%)

1.3 To shut down the laser IN EMERGENCY SITUATION ONLY

Use:

OFF (Stops emission, sets diode current to zero, turns crowbar on). Alternatively,

simply turn off at the keyswitch.

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The full command structure for the laser is given in the appended programmer

manual. The commands can, of course, be embedded into the user’s own software

for control of the laser with other equipment.

NOTE: TO PROTECT THE LASER CRYSTAL(S) THE LASER DIODE CURRENT IS

RAMPED UP AND THEREFORE THERE IS A TIME DELAY BEFORE LASER OUTPUT IS

OBSERVED AFTER A CURRENT DEMAND (RS232) OR A LASER ON COMMAND

(RS232).

THE OFF COMMAND DOES NOT RAMP THE CURRENT AND SHOULD BE USED

ONLY FOR EMERGENCIES.

2. Front Panel controls and indicators

Fig 1. Front Panel

Keyswitch

Status indicators Shutter status indicators

2.1 Keyswitch

The key switch is used to activate the laser system. The key is removable in the “Off” position,

but captive in the “On” position. When the system is to be left unattended, the key should be

removed and stored in a safe place. The key switch functions by activating the switch mode

power supply generating the voltages for laser operation.

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2.2 Indicators

Power (Green)

Indicates that the system has mains power applied, the internal switch mode power supply is

generating the correct voltages and the microprocessor is functioning.

Emission (Yellow)

Confirms that the laser is ready to lase or is lasing. This means that power is applied, the

keyswitch is in the “On” position, and the interlock chains are intact.

Remote (Yellow)

Indicates that the laser is running under remote control.

Interlock (Red)

Indicates that the interlock chain is open. This consists of the external interlock connector, and

internal thermal switches. When an interlock open condition is detected, the shutter (if

specified) is closed and the laser closed down in a safe condition.

It will be necessary to reset the interlock latch by turning the key off then on so that

the laser will power up again after remaking the interlock.

Fault (Red)

Indicates that a fault condition exists. This may be an over temperature indication, electronics

fault, shutter fault or other condition. The nature of the fault may be determined through

software.

Shutter open (Green)

Indicates that the electromechanical shutter is open and therefore laser output is possible.

Shutter closed (Red)

Indicates that the electromechanical shutter is closed and therefore laser output is not possible.

The shutter is opened and closed by software commands. There is redundancy in the facility for

sensing of the shutter position, in that it is sensed at both open and closed positions. Any

conflict between requested or actual position generates a fault and shuts the laser down safely.

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3. Rear Panel connections

FIG 2. Rear Panel

Mains input RS232 port Fibre optic port

PZT connector User interface Umbilical connector External interlock connector

3.1 Features

External interlock connect or

The external interlock connector gives access to the laser system interlock chain.

Contact closure is required between pins 1 and 3. The system is supplied with a

connector with a shorting link fitted. This should be used for test purposes only. The

link should be replaced/rewired with wiring through an external door or enclosure

switch once the laser system is installed.

Do NOT apply an external voltage to the connector. Contact closure is all that is

required, eg. by relay contacts.

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RS 232 Connector

9 way D-socket, pins 2 and pin 5 through connected, pin 3 at PC to pin 8 at laser (see

Fig 1). Connects to computer serial port.

Umbilical connector to laser head.

Takes 28 pin QM connector (umbilical cable supplied).

Fibre optic port

The pump laser diode light is fed to the laser head via a 3m armoured fibre optic

cable (supplied).

Mains input

Takes standard IEC mains connector. Universal input 100 - 240 VAC, 50/60Hz.

PZT Connector

The supplied cable conveys voltage to the PZT in the laser head.

4. System components and features

4.1 Laser Head Fig 3.

A picture of the laser head is shown below. A fibre optic cable is used to deliver the

pump beam to the laser gain material, (YAG, YVO4 or YLF) and the laser cavity optics.

Consequently the laser head does not contain the pump laser diode. This is situated

inside the power supply unit. The laser head is sealed with an RF tight gasket material

to reduce the possibility of RF emission and to prevent ingress of contaminants.

In harmonic systems, the frequency doubling and tripling crystals are housed in the

laser head, with appropriate focusing optics. The crystals are held in temperature

controlled ovens.

Finally, the output beam passes through the electro mechanical shutter, and exits the

laser through an appropriate window or filter, depending upon wavelength and output

specification.

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Fig 3. The Laser Head

Umbilical

Laser Head

Fibre optic input

4.2 Power supply Fig 4. and Fig 5.

The power supply is housed in a 2U high 19” case. (Bench top mounting case optional).

This case contains the switchmode power supply which delivers the required DC

voltages, the microprocessor board, diode current control board, TEC and oven

control board. The power supply also contains the fibre coupled pump laser diode

together with the necessary thermal management .The microprocessor board, as well

as providing the RS232 interface capability and controlling laser operation, monitors

safety and protective features. In addition, there are fail-safe hardware controls built

in to protect the laser diode in the event of a failure of the microprocessor core. (See

also front and rear panel control / connector sections).

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