Lambda SRS SR475 Operation Manual
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Lambda SRS SR475 Operation Manual

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Operation Manual
Stanford Research Systems
Distribution in the UK & Ireland
Lambda Photometrics Limited
Lambda House Batford Mill
Harpenden Herts AL5 5BZ
United Kingdom
E:
info@lambdaphoto.co.uk
W: www.lambdaphoto.co.uk
T:
+44 (0)1582 764334
F:
+44 (0)1582 712084
Laser Shutters
SR475 and SR476
Revision 1.2 • September 1, 2011

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  • Page 1 Distribution in the UK & Ireland Lambda Photometrics Limited Operation Manual Lambda House Batford Mill Harpenden Herts AL5 5BZ United Kingdom info@lambdaphoto.co.uk W: www.lambdaphoto.co.uk +44 (0)1582 764334 +44 (0)1582 712084 Laser Shutters SR475 and SR476 Stanford Research Systems Revision 1.2 • September 1, 2011...
  • Page 2 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.

  • Page 3: Table Of Contents

    Contents General Information Service ......Environment ......Laser Safety .
  • Page 4 Contents SR475 and SR476 Laser Shutters...

  • Page 5: General Information

    General Information The SR475 and SR476 Laser Shutters are high performance instru- ments designed to provide fast, versatile, and reliable mechanical blocking of a free-space laser beam while minimizing vibration and acoustic noise. Service Do not install substitute parts or perform any unauthorized modi- fications to this instrument.

  • Page 6: Symbols

    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) SR475 and SR476 Laser Shutters...

  • Page 7: Notation

    General Information Notation The following notation will be used throughout this manual. WARNING A warning means that injury or death is possible if the instructions are not obeyed. CAUTION A caution means that damage to the instrument or other equipment is possible.

  • Page 8: Specifications

    General Information Specifications Operation General Primary function Block/unblock laser beam Controller/Driver type SR470 Series Clear aperture 0.120” (3 mm) min. (SR475) 0.040” (1 mm) min. (SR476) Lifetime cycles min. Shutter blade Blade material BeCu alloy, black oxide finish Optical power Low-power laser beams;...
  • Page 9 General Information Electrical and Mechanical General Interface SRS Shutter interface connector Weight 0.28 lbs 2.25 W × 1.6 H × 1.0 D Dimensions ◦ ◦ Operating temperature C to 35 C, non-condensing ◦ Maximum temperature Shutter interface +12 VDC, +4.5 VDC Voltage inputs Current draw 1.20 A max.
  • Page 10 viii General Information SR475 and SR476 Laser Shutters...
  • Page 11 1 Getting Started This chapter gives you the necessary information to begin using the SR475 and SR476 Laser Shutters. In This Chapter Introduction to the Instrument ... . . 1 – 2 1.1.1 Overview .

  • Page 12: Operation

    1 – 2 Operation 1.1 Introduction to the Instrument The SR475 and SR476 Laser Shutters are high performance instru- ments designed to provide fast, versatile, and reliable mechanical blocking of a free-space laser beam while minimizing vibration and acoustic noise. The shutters are suitable for low-power beam switching and pulse selection applications.

  • Page 13: Mechanical Performance

    1.1 Introduction to the Instrument 1 – 3 active servo system instead of a solenoid and return spring, the SR475 and SR476 do not have a preferred state, and can stay indefinitely in either state without significant power dissipation. Significant power is only used when opening or closing, and each shutter head is rated for continuous duty without duty cycle restrictions.

  • Page 14: Power-Off And Standby States

    1 – 4 Operation the laser aperture, and in the closed position the shutter blade fully covers the aperture. The process of opening or closing the shutter consists of guiding the blade along a smooth, pre-determined trajectory between the closed and open positions.
  • Page 15 1.1 Introduction to the Instrument 1 – 5 Figure 1.2: Blade trajectory for the SR475 Laser Shutter (top) and SR476 Laser Shutter (bottom). Curve (a) illustrates the position of the SR475 blade as it moves from the closed to the open position, and curve (b) illustrates the closing trajectory.

  • Page 16: Mounting

    1 – 6 Operation the shutter head enters standby mode, the +12 VDC power should be kept low for at least three seconds. Once in Standby mode, the shutter head will remain so until reset. Note: The +4.5 VDC “logic” power supply is always provided to a shutter while it is connected to a powered-on SRS shutter controller such as the SR470 Shutter Controller or the SR474 Four-Channel Shutter Driver.

  • Page 17: Thermal Considerations

    1.2 Mounting 1 – 7 Figure 1.3: Physical dimensions and mounting of the SR475 and SR476 . The clear aperture is 0.120” (3 mm) for the SR475 and 0.040” (1 mm) for the SR476. For optimal results, use short, large-diameter mounting posts or other sturdy optomechanical hardware to mount SR475 and SR476 Laser Shutters to appropriate surfaces.

  • Page 18: Optical Alignment

    1 – 8 Operation and help them to run at a comfortable temperature, particularly in a warm laboratory environment. An internal thermal sensor will trip off if the shutter head overheats. In this case, the head will declare a fault and go to the Standby state. 1.2.3 Grounding considerations For reliable operation of a SR475 or SR476, it is essential that the shield of the shutter cable is properly grounded.

  • Page 19: Optical Power Capacity

    1.4 Optical power capacity 1 – 9 The rise and fall time of a laser beam chopped by the shutter are ap- plication dependent, determined by the size and profile of the laser beam. A narrower beam will blink on and off quickly compared to a broader beam, since the blade edge will take less time to transit a smaller beam.

  • Page 20: Alternate Speed Modes

    1 – 10 Operation CAUTION Never expose the SR475 and SR476 Laser Shutters to compressed air or other compressed gas dusters, since they could potentially damage the shutter mechanism. CAUTION Never touch or attempt to clean the shutter blade. 1.5.2 Magnetic field The SR475 and SR476 Laser Shutters use a magnetic mechanism and may not operate properly in the presence of a strong external magnetic field.
  • Page 21 1.6 Alternate speed modes 1 – 11 Three alternate modes of operation are provided, each of which guides the shutter along the same trajectory but at a slower rate. This leads to a significant reduction in power usage and physical im- pulse.

  • Page 22: Shutter Interface Connector

    1 – 12 Operation 1.7 Shutter interface connector The SR475 and SR476 Laser Shutters are normally operated through SR470 Series Laser Shutter drivers (such as the SR470 Shutter Con- troller or the SR474 Four-Channel Shutter Driver) that provide power and external interfaces. Users may also wish to directly interface the SR475 or SR476 to their own systems without the use of additional hardware.
  • Page 23 1.7 Shutter interface connector 1 – 13 must be provided at the shutter head following the pin-out specified in Table 1.3. Ground must be provided on pin 2, with chassis ground on the shield. Note that standard IEEE-1394 cables are crossover cables that reverse the signals of pins (3,5) and of (4,6) at the two ends.
  • Page 24 1 – 14 Operation SR475 and SR476 Laser Shutters...
  • Page 25 2 Remote Operation This chapter describes operating the SR475 and SR476 over the built- in serial interface. In This Chapter Index of Commands ....2 – 2 Introduction .

  • Page 26: Remote Operation

    2 – 2 Remote Operation 2.1 Index of Commands Motion control 2 – 5 Open 2 – 5 Close 2 – 5 Toggle state 2 – 5 Toggle alignment mode 2 – 6 Select speed mode 0 2 – 6 Select speed mode 1 2 –...

  • Page 27: Introduction

    2.2 Introduction 2 – 3 2.2 Introduction When an SR475 or SR476 is operated through an SRS shutter con- troller such as the SR470 Shutter Controller or the SR474 Four- Channel Shutter Driver, that instrument normally signals the shutter head to open or close through the shutter head’s logic-level control input.

  • Page 28: Commands

    2 – 4 Remote Operation 2.3 Commands This section provides syntax and operational descriptions for remote commands. 2.3.1 Command syntax Communication with the SR475 and SR476 uses ASCII characters. All commands are one character long and are case sensitive. Commands are executed when the command character is received without waiting for additional data or confirmation.

  • Page 29: Command List

    2.4 Command List 2 – 5 2.4 Command List 2.4.1 Shutter motion control commands Open Moves the shutter blade from the closed state to open state. When executed, this places the shutter into logic level lockout mode. (See description of command F.) The command to open the shutter will be ignored unless (1) the shutter is in the closed position, and (2) serial control of the blade position has not been disabled with command E.

  • Page 30: Shutter Control Mode Commands

    2 – 6 Remote Operation control of the blade position has not been disabled with command E. Select speed mode 0 Select full-speed mode for the shutter head. This is the default setting. The transition speed (and corresponding mechanical vibration) can be changed using mode commands 0, 1, 2, and 3.

  • Page 31: Communication Control Commands

    2.4 Command List 2 – 7 Flexible (default) control mode Serial control lockout and logic-level control lockout are both dis- abled, and either may control the shutter blade position. This is the default control mode, and is always selected after the shutter head is reset.

  • Page 32: Utility Commands

    2 – 8 Remote Operation 2.4.4 Utility commands Reset Performs a hard reboot of the shutter head. Upon restart the head will initialize and attempt to move the blade to the state indicated by the logic-level control input. The full startup sequence may take up to one second.
  • Page 33 2.4 Command List 2 – 9 Rate Query the maximum rate of the shutter head. The returned value indicates the maximum rep rate of the shutter head, in Hz, rounded down to the nearest integer. The rate depends on the speed mode that is selected; see §1.6. Example: The shutter has a maximum rate of 100 Hz.
  • Page 34 2 – 10 Remote Operation detected will be recorded in the error word. Example: The returned value of 64 indicates a problem with the 12 VDC shutter power supply. Model Number Query the shutter head model. Returns the 7 character ASCII iden- tifier, either “...
  • Page 35 Bits 12 and 13, Mode number give a number from 0 to 3 that indicates which of the alternate speed modes is presently selected. Distribution in the UK & Ireland Lambda Photometrics Limited Lambda House Batford Mill Harpenden Herts AL5 5BZ United Kingdom Characterisation, info@lambdaphoto.co.uk...

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Srs sr476

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