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Summary of Contents for New Wave Research Tempest
- Page 1 Operator’s Manual New Wave Research, Inc. Tempest and Gemini PIV Nd: YAG Lasers New Wave Research, Inc. 47613 Warm Springs Blvd. Fremont, CA 94539 October 2000...
- Page 2 Copyright © 2000, 1998 by New Wave Research, Inc. All rights reserved. Printed in the U.S.A. Reproduction or translation of any part of this publication, except as permitted by the 1976 United States Copyright Act, without prior written permission of New Wave Research, Inc. is unlawful.
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Page 3: Preface
PIV comply with the Center for Device and Radiological Health (CDRH) Standard 21 CFR 1040. The Tempest and Gemini PIV laser systems are Class 4 lasers and emit laser radiation that can be harmful to your eyes and skin. It is... - Page 4 Tempest Nd:YAG Laser Operator’s Manual...
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Page 5: Table Of Contents
External Computer Control......................15 Safety Interlocks ..........................15 Power Supply ..........................16 Electronics ........................... 16 Water Cooling System......................... 16 Tempest Specifications........................16 Gemini PIV Specifications ......................17 Chapter Three, Installation ........19 Voltage Requirements........................20 Power Line Fuse ..........................20 Laser Umbilical .......................... - Page 6 Tempest Nd:YAG Laser Operator’s Manual Power Supply ..........................26 Control Panel ..........................27 Interlocks ............................27 Internal Interlocks........................27 External Interlock ........................27 Triggering and Timing ........................28 Inputs and Outputs........................28 Internal Triggering ........................29 External Triggering........................30 External Q-switch Triggering....................... 32 External Flashlamp Triggering ....................
- Page 8 Figure 1-6: Warning Label, International....................10 Figure 1-7: Aperture Label ........................11 Figure 1-8: Defeatable Interlock Label..................... 11 Figure 2-1. Layout of Tempest Head with Options ................. 14 Figure 3-1: Voltage Switch ........................20 Figure 3-2: Power Supply Back Panel ..................... 21 Figure 4-1: Control Panel Layout ......................
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Page 9: Chapter One, Laser Safety
Chapter One, Laser Safety... - Page 10 Tempest Nd:YAG Laser Operator’s Manual...
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Page 11: Introduction
IR laser heads combined in a single package with a second harmonic generator and two discrete power supplies. All information for the Tempest applies to the Gemini-PIV, so the Gemini PIV will be inferred by reference. The Tempest Nd:YAG laser generates high energy infrared radiation that Optical Safety can pose serious risks to eye safety. -
Page 12: Laser Safety
Laser Safety light sources. Special precautions must be observed when working with the Tempest pulsed Nd:YAG laser. The safe use of lasers requires that all laser users, and people working in the same area as the laser, are aware of the dangers involved. -
Page 13: Electrical Safety
Features Laser Covers The Tempest laser head is enclosed in a protective housing that prevents access to radiation in excess of Class I limits, except for the output beam, which is Class IV. The cover also protects against stray radiation from the Tempest. -
Page 14: Exit Shutter
• Remote interlock interrupted (if installed) Exit Shutter The Tempest has an exit beam shutter located on the laser head housing. The laser beam may be blocked by closing the shutter. Do not use the exit beam shutter as a method of blocking the beam for more than a few seconds. -
Page 15: Government Regulations
Classification be classified according to the output power or energy and the laser wavelength. The Tempest is classified as Class IV based on 21 CFR, subchapter J, part II, section 1040-10 (d). According to the European Community standards, the Tempest is classified as Class IV based on EN 60825-1, clause 9. -
Page 16: Figure 1-1: Location Of Labels
Tempest Nd:YAG Laser Operator’s Manual Mechanical Shutter Aperture Label I.D. Label Warning Label Interlock Label I.D. Label Certification label (Inside) Figure 1-1: Location of Labels... -
Page 17: Figure 1-2: Certification Label
Laser Safety COMPLIES WITH 21 CFR 1040.10 AND 1040.11 Figure 1-2: Certification Label Figure 1-3: Power Supply Identification Label Figure 1-4: Laser Head Identification Label... -
Page 18: Figure 1-5: Warning Label, U.s
Tempest Nd:YAG Laser Operator’s Manual WAVELENGTH 1064 nm/600 mJ/5 ns WAVELENGTH 532 nm/400 mJ/5 ns WAVELENGTH 355 nm/300 mJ/4 ns WAVELENGTH 266 nm/200 mJ/4 ns WAVELENGTH 213 nm/100 mJ/4 ns WAVELENGTH 670 nm 3 mW Figure 1-5: Warning Label, U.S. -
Page 19: Figure 1-7: Aperture Label
Laser Safety VISIBLE AND INVISIBLE LASER RADIATION IS EMITTED FROM THIS APERTURE AVOID EXPOSURE Figure 1-7: Aperture Label DANGER VISIBLE AND INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCK DEFEATED. AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION Figure 1-8: Defeatable Interlock Label... -
Page 20: Chapter Two, Description And Specifications
Tempest Nd:YAG Laser Operator’s Manual Chapter Two, Description and Specifications... -
Page 22: Introduction
A summary of system specifications is given on the last page of this chapter. This section gives an introduction to the optical layout in the Tempest Optical Layout Nd: YAG laser. The standard Tempest configuration is a wide body, with room for installing the optional attenuator and harmonics. -
Page 23: Second Harmonic Generation
The second harmonic light is vertically polarized. Third Harmonic The third harmonic at 355 nm may be generated in the Tempest if the Generation option has been purchased and installed. The third harmonic at 355 nm is generated by combining one photon at 532 nm with one photon at 1064 nm. -
Page 24: Power Supply
Tempest Nd:YAG Laser Operator’s Manual The power supply controls the Tempest Nd: YAG laser, supplying the Power Supply required power and signals to safely operate the laser. The Tempest power supply is built on three levels, with functional groups separated on the three different levels. -
Page 25: Gemini Piv Specifications
The following table shows the Gemini PIV specifications for the Gemini PIV different models that are available. The specifications are subject to Specifications change without notice. Table 2-2: Gemini PIV Performance Specifications Energy 532 nm Gemini PIV 15 120 mJ Gemini PIV 30 90 mJ Beam Diameter... -
Page 27: Chapter Three, Installation
Chapter Three, Installation... -
Page 28: Voltage Requirements
Tempest Nd:YAG Laser Operator’s Manual The power supply has been preset at the factory for 95 – 125 VAC or Voltage 200 – 250 VAC single phase operation, depending upon the voltage Requirements supply available at your location. However, the laser can be switched on site from 95-125 VAC to 200-250 VAC. -
Page 29: Laser Umbilical
There is also a fuse on the cooling control board. The cooling control board mounts underneath the middle shelf. The fuse is type 3AG SloBlo, rated for 3 Amps, 250 V. An acceptable fuse for the cooling control board is: Manufacturer Fuse 90–250 VAC... -
Page 30: Control Panel
Tempest Nd:YAG Laser Operator’s Manual The control panel is connected to the power supply through a 10 foot Control Panel detachable DB15 extension cable. The connectors on both the control panel and the power supply are female DB-15. Connect the control panel cable to the control panel and to the back of the power supply. -
Page 31: Chapter Four, Operation
Operation Chapter Four, Operation... - Page 32 Tempest Nd:YAG Laser Operator’s Manual...
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Page 33: Starting The Laser
Operation After the installation procedure is completed and the laser safety section Starting the is thoroughly understood, the laser may be started. All covers must be Laser installed and the reservoir filled with deionized (distilled) water. See Figure 4-1 for location of controls on the control panel. Figure 4-1: Control Panel Layout 1) Close the shutter on the front of the laser head. -
Page 34: Turning The Laser Off
4) Turn the power supply key switch to the OFF position. 5) Turn the AC power line switch OFF. The Tempest Nd: YAG laser can be operated by using the standard Controls and control panel. The control panel connects to the laser power supply via a... -
Page 35: Control Panel
LASER EMISSION LED serves as warning when the laser is enabled to fire. An optional attenuator provides wide range energy adjustment without affecting beam quality. The Tempest Nd: YAG laser system is equipped with both internal and Interlocks external interlock switches. The interlocks are designed to ensure that the laser is operated only when this can be done in a safe manner. -
Page 36: Triggering And Timing
The laser may then be started using the procedure given above in the section “Starting the Laser.” The process to fire the Tempest laser requires two steps. The first step is Triggering and triggering the flashlamp, and the second is triggering the Q-switch. Both... -
Page 37: Internal Triggering
“Flashlamp Trigger” BNC. Internal Triggering Internal triggering is the simplest way to run the Tempest Nd: YAG laser. The control electronics provide the necessary triggers to fire the laser. The flashlamp and Q-switch toggle switches should both be up, in the INT position. -
Page 38: External Triggering
Tempest Nd:YAG Laser Operator’s Manual ~2 ms pulse Lamp Synch OUT Q-switch Delay (~190 µsec) ~2 ms pulse Q-switch Synch OUT ~130 ns Laser Pulse Figure 4-3: Timing Diagram for Internal Triggering External External triggering gives the user control over the timing of the laser Triggering pulse. -
Page 39: Figure 4-4: Timing Diagram For External Triggering
Operation Pulse Width ≥ 100 µs External Lamp Trigger IN ~9.25 µs ~2 ms pulse Lamp Synch OUT Adjustable Q-switch Delay Pulse Width ≥ 100 µs External Q-switch Trigger IN ~50 ns ~2 ms pulse Q-switch Synch OUT ~130 ns Laser Pulse Figure 4-4: Timing Diagram for External Triggering... -
Page 40: External Q-Switch Triggering
Tempest Nd:YAG Laser Operator’s Manual External Q-switch External Q-switch triggering allows the user to fire the Q-switch Triggering externally while the internal electronics control the flashlamp firing. The user must supply a TTL pulse to the Q-switch trigger with the appropriate delay following the internal flashlamp pulse. -
Page 41: Table 4-1: Db 25 Pin Assignments
Operation Table 4-1: DB 25 Pin Assignments Input/Output Function Signal Mode Input Start/Stop Laser. See table 4-2. + 5 VDC Level Output Laser Ready + 5 VDC Level Input Inhibit Q-switch + 5 VDC Level Input External Single Shot Trigger + 5 VDC Pulse Input... -
Page 42: Harmonic Generators
Use the following procedure to install the second harmonic generator. 1) Remove the Tempest laser head cover and install the interlock defeat. 2) Install the second harmonic generator using the alignment pins and screw holes closest to the laser head. Insure that the harmonic generator housing is installed such that it is flush against the second alignment pin. -
Page 43: Figure 4-5: Second Harmonic Waveplate Optimization
Operation 3) Install the 532 nm dichroic separation mirrors using the alignment pins and screw holes closest to the beam exit. 4) Turn the laser on at low energy to ensure that the beam is passing through the center of the SHG crystal. Increase the lamp voltage to increase the SHG energy. -
Page 44: Third Harmonic Installation
Tempest Nd:YAG Laser Operator’s Manual 7) Remove the interlock defeat and reinstall the Tempest laser head cover. Third Harmonic The third harmonic generator (THG) crystal may be used to provide UV Installation radiation at 355 nm. The third harmonic generation process is Type I in BBO, created with horizontally polarized fundamental and second harmonic light. -
Page 45: Gemini Piv Alignment
Operation 2) Insure that the second harmonic generator is installed according to the instructions given above. 3) Install the fourth harmonic generator using the second set of alignment pins and screw holes. Insure that the harmonic generator housing is installed such that it is against the second alignment pin. 4) Install the 266 nm dichroic separation mirrors using the alignment pins and screw holes closest to the beam exit. -
Page 46: Figure 4-7: Gemini Piv Beam Overlap Adjustment
Tempest Nd:YAG Laser Operator’s Manual Polarizer Assembly Laser #1 Optical Attenuator (optional) Laser #2 Fold Mirror #3 Figure 4-7: Gemini PIV Beam Overlap Adjustment 1) Remove the smaller optics head cover to provide access to the beam combining optics and second harmonic generator. -
Page 47: Gemini Uv Operation
Operation 6) Fire laser #2 and note the position of the beam on the mirror, relative to the beam from laser #1. Adjust the fold mirror #1 to overlap the two visible beams immediately after the second harmonic generator. 7) Observe the overlap of the two beams at a point 1-2 meters away from the laser head. -
Page 48: Third Harmonic Installation
Tempest Nd:YAG Laser Operator’s Manual Third The third harmonic generator (THG) crystal may be used to provide UV Harmonic radiation at 355 nm. The third harmonic generation process is Type I in BBO, Installation created with horizontally polarized fundamental and second harmonic light. A half wave plate for the second harmonic is mounted on the input to the THG housing. -
Page 49: Return To 532 Nm Operation
Operation 3) Remove the 532 nm dichroic mirror set closest to the exit aperture and install the 266 nm dichroic mirror set using the same alignment pins and screw holes. 4) Adjust the wave plate on the second harmonic generator housing to maximize the 266 nm energy, Figure 4-5. -
Page 51: Chapter Five, Maintenance
Chapter Five, Maintenance... - Page 52 Tempest Nd:YAG Laser Operator’s Manual...
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Page 53: Introduction
Maintenance The Tempest Nd:YAG laser is a high power laser system and it is Introduction important to keep the laser clean and well maintained. This section describes several procedures that should be performed on a regular basis to ensure that the laser system works properly for many years. -
Page 54: Figure 5-1. Cooling System In The Power Supply
Tempest Nd:YAG Laser Operator’s Manual until all water has been pumped out of the system. Press the OFF button on the remote to stop the pump. 4) Turn the power supply off with the switch at the AC power entry module on the back of the power supply, and disconnect the AC power cord from the power supply. -
Page 55: Cooling System Flush
Maintenance section for detailed instructions. Disconnect power before replacing cover. Cooling System If a noticeable drop in laser energy has occurred, it may be necessary to Flush flush the cooling system to remove any contaminants. Carbon dioxide from the air and metal ions will naturally collect in the cooling water over time. -
Page 56: Figure 5-2. Deionization Cartridge And Water Reservoir
Tempest Nd:YAG Laser Operator’s Manual DI cartridge hose Water pump Flow switch Figure 5-2. Deionization Cartridge and Water Reservoir 8) Refill the cooling system with a solution of 5% acetic acid in distilled water. Alternately, distilled white vinegar may be purchased at the grocery store and used. -
Page 57: Flashlamp Replacement
Maintenance 15) Completely fill the system again with pure deionized/distilled water. Reconnect the deionization cartridge to maintain the water purity. The laser is now flushed. Run the laser for thirty minutes, then optimize the system for laser output. Measured output should be back to normal. -
Page 58: Figure 5-5. Removal Of Pump Chamber Assembly End Cap
Tempest Nd:YAG Laser Operator’s Manual Pump Chamber Q-Switch Figure 5-4. Pump Chamber Attachment Screws 5) Remove the pump chamber from the laser head and carefully place it on a clean surface. 6) Remove the pump chamber end caps that secure the flashlamp within the pump chamber, Figure 5-5. -
Page 59: Figure 5-6. Pump Chamber Water Seal O-Rings
Maintenance Do not touch the glass surface of the lamp with your bare fingers, or other skin. This may leave grease marks that will degrade lamp performance and may shorten lamp lifetime 9) Slide the o-rings over the flashlamp lead and into place using tweezers. - Page 60 Tempest Nd:YAG Laser Operator’s Manual 14) Start the power supply and check the cooling system for leaks before replacing the laser head cover. Disconnect power before replacing the laser head cover.
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Page 61: Chapter Six, Troubleshooting
Chapter Six, Troubleshooting... - Page 62 Tempest Nd:YAG Laser Operator’s Manual...
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Page 63: Introduction
This chapter lists a number of conditions that may be observed during Introduction the lifetime of the Tempest Nd:YAG laser system. Following the list of conditions is a set of procedures that may be used for resolving specific conditions to improve laser performance. -
Page 64: Procedure 2. Laser Starts, But No Light Is Emitted
Procedure 4. Unstable laser energy The pulse stability for the Tempest Nd:YAG laser is specified as ± 2% at 1064 nm for greater than 98% of pulses for 10,000 pulses after 30 min warm up. -
Page 65: Procedure 5. Clipped Laser Beam
• For fluctuations in the laser energy in the harmonics check that the laser is running at full energy. Call New Wave Research if it is not possible to increase the laser pulse energy by this procedure. Procedure 5. Clipped laser beam The output beam of the Tempest Nd:YAG laser should be round, symmetric with even energy distribution. -
Page 66: Procedure 7. Low Third Harmonic Energy
Tempest Nd:YAG Laser Operator’s Manual • Adjust the SHG crystal angle to maximize the output energy. • Adjust the waveplate on the input to the SHG housing to maximize the energy. • If the optional attenuator is installed, ensure that the attenuator knob is rotated fully clockwise to the maximum energy/minimum attenuation setting. - Page 67 Troubleshooting • Adjust the 4HG crystal angle to maximize the output energy. • Adjust the wave plate on the input to the SHG housing to maximize the energy. • Adjust the SHG crystal angle to maximize the output energy. • If the optional attenuator is installed, ensure that the attenuator knob is rotated fully clockwise to the maximum energy/minimum attenuation setting.
- Page 69 Warranty - Page 61 -...
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Page 70: Appendix A, Part Numbers
Tempest Nd:YAG Laser Operator’s Manual Appendix A, Part Numbers The following part numbers can be ordered by contacting the New Wave Research service department at Tel: 800-566-1743 Table B-1: Part Numbers for Laser Head Flash lamp 0002-0036-1 Pump chamber 0002-6722... - Page 72 Tempest Nd:YAG Laser Operator’s Manual Tempest Nd:YAG Laser Operator’s Manual © New Wave Research, Inc. 1/2000, Printed in the U.S.A. New Wave Research, Inc. P/N: 0002-6790 Version 1.2...
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