Operating instructions 471 821
Contents
1. to the necessary size by means of screens Rooms where experiments using laser light are carried out are to be labelled with warning signs Page 2 4 The path of the beam is to be adjusted in such a way that it is not at eye height neither for standing nor for sitting peo ple Any optical equipment located in the optical path is to be fixed in such a way that any unintended change in its posi tion is not possible The optical effects to be investigated are always to be ob served on a projection or transparent screen where diffuse reflection or scattering reduces the strength of the radiation to a value which Is safe for the observing eye Even with op timum diffuse reflection where there are no directional parts of the beam the following limiting values apply the minimum distance between the diffuse reflector and the cornea must be 13 cm the maximum observation time is 10 s With many diffusers directional parts of the beam are to be expected For this reason the observation distance should be chosen to be much greater and or the observation time much shorter For the observation of the images or figures created by diffuse scattered or diffracted laser light in an experiment the dazzling limit must never be exceeded Radiation above the maximum permissible exposure MPE also from reflected or scattered laser radiation is to be pre vented If this is not possible with lasers of class 3B appro priate eye protection e g ad2. Lehr und Didaktiksysteme Physics Chemistry Biology Technology LD Didactic GmbH Leyboldstrasse 1 D 50354 Huerth 01 08 CS Operating instructions 471 821 He Ne laser head 5 mW 471 821 Beam exit opening Aperture for blocking the laser beam Connection lead with high voltage plug Warning and information signs Earth connection 0O A O N Operating instructions 471 821 Safety notes The He Ne laser emits visible radiation at a wavelength of 632 8 nm with a max emission power of 5 mV and therefore it conforms to the rules for class 3B in EN 60825 1 Safety of laser products The accessible laser radiation is dangerous for the eyes and in particular cases also for the skin Warning Caution If equipment other than that described here is used for operation or calibration or if different processes are carried out this could lead to dangerous exposure to radiation Protection measures and behaviour rules Only allow the He Ne laser to be operated by authorised and trained people Anybody involved with or observing the experiment is to be instructed about the hazards from laser radiation and the necessary protection measures Do not look directly into the laser beam not even when its diameter has been widened e g by means of inserted lenses Carry out experiments with the lowest power of radiation required Avoid unintended reflections e g from tools watches jewel lery Restrict the laser area
3. ible damage the He Ne laser is to be switched off and secured against unin tended operation e On account of the operating and starting voltages which may reach a level dangerous to life the housing must not be opened under any circumstances Operating instructions 471 821 Warning and information signs LASER RADIATION AVOID DIRECT EXPOSURE TO BEAM HELIUM NEON LASER 15 MILLIWATT MAXIMUM OUTPUT WAVE LENGTH 633 nm CLASS Illb LASER PRODUCT ACCORDING TO CDRH 1 Description The He Ne laser head 5 mW provides a narrow nearly parallel beam of monochromatic coherent and linearly polarised light It is an ideal laser light source for all experimental setups where higher power is desired e g laser Doppler anemometry On account of the linear polarisation this laser is also suitable for experiments on the rotation of the polarisation plane and light modulation e g saccharimetry Faraday effect Kerr effect and Pockels effect 2 Scope of delivery 1 He Ne laser head with permanently attached connection lead with HV plug In addition the following is required 1 Power supply for He Ne laser 5 mW 471 825 In addition the following is recommended 1 Laser support 470 010 Adjustment goggles for He Ne laser 471 828 3 Technical data Protection class conforming to DIN EN 60825 1 Wavelength Output power Beam diameter Beam divergence Mode Minimum polarisation Service life of the tube Dimensi
4. justment goggles for He Ne la ser 471 828 protective clothing or gloves are to be worn In doubt the laser safety officer is to be involved When not in use the laser equipment is to be protected against unauthorised use by removing the key from the key switch in the power supply Page 3 4 e In Germany the accident prevention rules according to BGV B2 Laser radiation and if applicable any directives from the culture minister apply in other countries the regulations ap plicable there have to be observed The light proof housing reliably prevents the emission of uncon trolled radiation The laser beam exit is found at the end of the cylinder which is marked with the sign Beam exit In addition an aperture is provided there which can be used for blocking the beam For safe operation the power supply for the He Ne laser 5mW 471 825 is required In order to prevent starting up by unau thorised persons the power supply for the He Ne laser 5mW 471 825 is equipped with a key switch The safe operation of the He Ne laser is guaranteed for the intended use However safety is not warranted if the He Ne laser is operated inappropriately or treated without due care If it must be assumed that safe operation is no longer possible the He Ne laser must be switched off without delay e g when there is obvious damage e Before starting up the housing is to be inspected for dam age In the case of functional faults or vis
5. ons Mass LD Didactic GmbH Leyboldstrasse 1 by LD Didactic GmbH Laser class 3B 632 8 nm gt 5 mW 0 81 mm 1 1 mrad TEMoo 500 1 gt 15 000 h 400 mm 44 2 mm 800 g Page 4 4 4 Operation Important Observe the safety information Attach the He Ne laser head 5 mW in the laser support 470 010 Insert the HV plug of the laser head into the connection socket of the switched off power supply for the 5 mW He Ne laser Ensure that the plug is fully inserted Before starting up the laser head connect the earth connec tion to earth potential Connect the power supply to the alternating current network Release the power supply by operating the key switch The laser will start after three seconds D 50354 Huerth Germany Phone 49 2233 604 0 Fax 49 2233 604 222 e mail info Id didactic de Printed in the Federal Republic of Germany Technical alterations reserved
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