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Chapter Three: System Details

© 2019 Cutting Edge Optronics, Inc.

16

Iklwa Laser User Manual

Approved for Public Release; NG19-2099 CEO-UMAN-0055E

Closed Loop Chiller

The single most common cause of a laser returned for repair involves customer damage.
More than one third of these damaged lasers result from cooling problems. Coolant
problems almost always require the replacement of the diode arrays - the single most
expensive component in Northrop Grumman lasers. This section describes how to avoid
damaging arrays.

WARNING.

Do not operate laser without cooling. Do not power the laser diodes or Q-

switch without cooling. Inadequate heat dissipation will seriously damage the laser
diodes or Q-switch and will void warranty.

Table 3-3. Heat Capacity and Minimum Flow Rate

Model

Heat Capacity

1

Minimum Flow Rate

IKA-012-QTG

IKA-016-QTG

800 W

1.5 gpm (5.7 lpm)

1

Heat c

apacity should be greater than the laser’s power consumption.

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Содержание IKA-012-QTG

Страница 1: ...1 Iklwa Laser Head Gen I and Gen II User Manual CEO UMAN 0055 Rev E 2019 Cutting Edge Optronics Inc Approved for Public Release NG19 2099 ...

Страница 2: ...nter Hours 8 00 a m to 5 00 p m Central time Technical Support 636 916 4900 follow prompts for department directory Email ngceoservice ngc com Cutting Edge Optronics Headquarters 20 Point West Blvd St Charles MO 63301 USA Sales Support 636 916 4900 follow prompts for department directory After office hours please leave a voice mail message Outside North America contact a Northrop Grumman sales off...

Страница 3: ...electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of Northrop Grumman Patents Northrop Grumman Systems Corporation products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specification...

Страница 4: ... 2019 Cutting Edge Optronics Inc iv Iklwa Laser User Manual Approved for Public Release NG19 2099 CEO UMAN 0055E ...

Страница 5: ...en ready to reclaim the instrument properly transfer it according to local regulations concerning WEEE equipment Contact Northrop Grumman or a local distributor for shipping instructions Please package the products as directed for a return for repair ROC ROHS Declaration In accordance with the Clause 6 2 of Marking for Control of Pollution Caused by Electronic Information Products SJ T11364 2006 f...

Страница 6: ...separates a sequence of button pushes e g MENU CHANNEL SETUP PULSE WIDTH means push the MENU button then push the CHANNEL SETUP soft key and then push the PULSE WIDTH soft key italic Italic text denotes references to other resources that may be helpful or bring attention to important information This icon denotes a note which contains important information I O Power Switch Position Symbols I On O ...

Страница 7: ... 2019 Cutting Edge Optronics Inc vii Iklwa Laser User Manual Approved for Public Release NG19 2099 CEO UMAN 0055E Shock Hazard Use caution Caution Risk of danger Refer to manual Chassis Ground ...

Страница 8: ...y follow these instructions Do not attempt to operate the laser system before carefully reading this complete operation manual For any questions on the product that have not been discussed sufficiently in this manual contact the manufacturer for complete instructions Failure to heed this warning may result in the destruction or serious damage to the device and will void the product warranty The tr...

Страница 9: ...ails provides information about components of a laser system and proper environmental conditions for operation Chapter 4 Installation and Operation discusses how to unpack setup and powering on the system for the first time Chapter 5 Maintenance provides information on proper maintenance of the laser system Chapter 6 Customer Service provides resources to help fix problems with the Iklwa laser Cha...

Страница 10: ...r for Devices and Radiological Health Compliance 8 Chapter 3 System Details 10 Iklwa Laser Head 11 Iklwa Wiring Interface 13 Closed Loop Chiller 16 Chapter 4 Installation and Operation 21 Unpacking The Laser System 22 Laser Head Setup 22 Chiller Set Up 23 Connections to the Laser Head 25 First Time Laser Power Up Procedure 30 Daily Operation 31 Output Power Control 32 External Triggering and FPS 3...

Страница 11: ...intain Chiller 37 Check Hold Off 38 Extend Lifetime of Laser Diodes 38 Optimize Laser Performance 38 Chapter 6 Customer Service 43 Module Replacement 44 Return the Instrument for Repair 44 Chapter 7 Troubleshooting 45 Initial Checklist 46 Laser Output Power 46 Appendix A System International Units 50 Appendix B Acronyms 51 Index 53 ...

Страница 12: ...nd Minimum Flow Rate 16 Table 3 4 Cooling System Requirements 17 Table 3 5 Avoid with Chillers 17 Figure 3 7 Constant Dew Point Lines for Ambient Temp and Rel Humidity 19 Table 3 6 Table of Air Condensation Temp 20 Figure 4 1 Setup for the laser power test 22 Figure 4 2 Water Hoses and Filter Connections 23 Figure 4 3 Chiller Assembled with Water Hoses and Filter 24 Figure 4 4 Connectors on the re...

Страница 13: ...3 Signal Connection 29 Figure 4 15 First Giant Pulse with FPS Disabled 33 Figure 5 1 40 Gram Desiccant Cartridge Top 36 Figure 5 2 40 Gram Desiccant Cartridge Bottom 36 Figure 5 3 5 Gram Desiccant Cartridge 36 Figure 5 5 Example of Power Dependence and Pulse to Pulse Instability 39 Figure 5 6 Example of Laser Performance Dependence on the Operating Current 40 Figure 5 7 Accessible Holes for HR and...

Страница 14: ...g Edge Optronics Inc 1 Iklwa Laser User Manual Approved for Public Release NG19 2099 CEO UMAN 0055E Chapter 1 Introduction This introduction provides the following information Theory of operation System description ...

Страница 15: ...returns to the oscillator and is conserved amplified and returned to the nonlinear frequency converter As a result nearly all the power which could have been optimally coupled out of the cavity by a semi transparent mirror is now converted to another wavelength provided that the semi transparent mirror is replaced by one that is fully reflective at the fundamental wavelength The Iklwa uses this in...

Страница 16: ...tent Laser beam quality will degrade if the diameter of the fundamental mode is much smaller than the limiting aperture causing higher order modes to oscillate with a larger transverse extent and a higher divergence than the fundamental mode Beam quality is dependent upon the product of the diameter of the beam and its angular divergence as it propagates into the far distance This product is conse...

Страница 17: ...each laser specific required pressure 2 Drain the chiller and replace the coolant and filter monthly This may be required more often if the system shows signs of contamination Electronic Interface Diode Array Current The diode array voltage and current operating parameters are supplied on the laser head test data sheet The standard 16 W Iklwa laser uses a 12 bar laser diode module Assuming 1 8 Vol...

Страница 18: ...e Iklwa laser head the flow switch electrical contacts close Northrop Grumman will provide the required diode array current diode array voltage chiller temperature and TEC temperature operating parameters on the test report supplied with the laser Thermal Control Subsystem Thermal control and heat removal from the laser transmitter is accomplished by the chiller The laser is equipped with an integ...

Страница 19: ...refully before installing or operating the laser A Northrop Grumman trained service engineer should perform all service and repair operations If planning to service the laser please follow the procedures in Chapter 5 Maintenance Sections included in this chapter include Safety Overview Precautions for Safe Operation Caution and Warning Statements CDRH Compliance ...

Страница 20: ...ocedures other than those specified herein may result in hazardous radiation exposure WARNING At all times during installation operation maintenance or service of the laser avoid exposure to laser or collateral radiation exceeding the accessible emission limits listed in Performance Standards for Laser Products U S Code of Federal Regulations 21 CFR 1040 10 d CAUTION The laser diodes in the IKLWA ...

Страница 21: ... up experiments so the laser beam is below eye level Work in an area that is well lighted to avoid dilation of pupils Set up a target for the beam Set up shields to prevent reflected beams from escaping the laser operation area View an infrared laser beam with a protected image converter at an oblique angle reflecting from a diffuse surface Ensure that all electrical connections are made in a safe...

Страница 22: ...Chapter 2 Laser Safety 2019 Cutting Edge Optronics Inc 9 Iklwa Laser User Manual Approved for Public Release NG19 2099 CEO UMAN 0055E Figure 2 1 Radiation Control ...

Страница 23: ...ics Inc 10 Iklwa Laser User Manual Approved for Public Release NG19 2099 CEO UMAN 0055E Chapter 3 System Details This chapter discusses the operation of the Iklwa laser Iklwa laser head Iklwa wiring interface Closed loop chiller ...

Страница 24: ...ors at the rear of the laser The laser emission indicator is located on the side of the unit The output window is positioned 76 2 mm 3 from the bottom of the Iklwa laser and 99 7 mm 3 93 from the side with the emission indicator Figure 3 1 Iklwa Front View The rear panel of the Iklwa laser has connectors for electronic control The COOLANT IN and COOLANT OUT ports are also found on the back panel F...

Страница 25: ... aperture It can allow an output beam of up to 3 W at the same rep rate and pulse width as the main beam This beam would be capable of causing eye or skin damage from direct exposure or specular reflection of the beam Always replace the screws in the alignment holes WARNING Additional adjustment holes in the top cover of the laser housing provide access to the HR cavity mirror and HM cavity mirror...

Страница 26: ...476L16 26S Connector M85049 52 1 16N Backshell Figure 3 5 Iklwa J1 Connector Interface Table 3 1 J1 Connections 1 Pin Signal Description A Laser On LED Positive 24 V Keep isolated from other circuits Laser on lamp on the laser housing B Laser On LED Negative 24V return C Shutter Drive Positive 14V D Shutter Drive Negative 14V return H Cover Interlock 1 Continuity to pin X indicates that the cover ...

Страница 27: ...er head otherwise open circuit K Not Used Pin K shorted to pin a for Northrop Grumman test electronics a Not Used Pin a shorted to pin K for Northrop Grumman test electronics b LBO Oven RTD 1 To Oven Industries 5C7 195 temperature sensor control pin 1 or 5R6 900 terminal 7 c LBO Oven RTD 2 To Oven Industries 5C7 195 temperature sensor control pin 3 or 5R6 900 terminal 8 G TE Cooler Drive POS Conne...

Страница 28: ...ve Divide current with Pin B Voltage and current per test report Approximately 20V and 25A B Array Drive Positive Divide current with Pin A Voltage and current per test report Approximately 20V and 25A C Array Drive Negative Divide current with pin D Array Drive Return D Array Drive Negative Divide current with pin C Array Drive Return 1 Connector Part Number MS3476L14 4S Backshell Part Number M85...

Страница 29: ...e the replacement of the diode arrays the single most expensive component in Northrop Grumman lasers This section describes how to avoid damaging arrays WARNING Do not operate laser without cooling Do not power the laser diodes or Q switch without cooling Inadequate heat dissipation will seriously damage the laser diodes or Q switch and will void warranty Table 3 3 Heat Capacity and Minimum Flow R...

Страница 30: ...t should be replaced each month or more frequently if the pH drops below 9 or the filter or coolant show any discoloration 4 When not using Northrop Grumman drive electronics verify that flow sensor interrupts current to diodes less than 1s after a low flow condition occurs Table 3 5 Avoid with Chillers Avoid with Chillers De ionized water1 Iron or aluminum parts in plumbing loop Operation below a...

Страница 31: ... the laser there is no risk of damaging the laser WARNING Do not operate the coolant system below air condensation temperature dew point at the laser head Condensation on the diode arrays can seriously damage the laser head and will void the warranty Consult Northrop Grumman technical service with any questions Air Condensation Temperature The air condensation temperature or dew point is the highe...

Страница 32: ...er is important to extend the lifetime of SHG crystal The desiccant cartridge on the top cover can help to removes excess moisture from inside the laser head WARNING Do not operate the laser without a functional desiccant cartridge Condensation on the diode arrays can seriously damage the laser and may void warranty Figure 3 7 Constant Dew Point Lines for Ambient Temp and Rel Humidity ...

Страница 33: ... 20 0 22 36 6 11 0 2 0 3 6 7 8 11 1 13 9 16 3 18 4 20 3 22 0 24 35 4 9 5 0 4 5 3 9 6 12 9 15 7 18 2 20 3 22 3 24 0 26 34 2 8 0 1 3 7 1 11 3 14 8 17 6 20 1 22 3 24 2 26 0 28 33 0 6 5 2 9 8 8 13 1 16 6 19 5 22 0 24 2 26 2 28 0 30 31 8 4 9 4 6 10 5 14 9 18 4 21 4 23 9 26 2 28 2 30 0 32 30 6 3 4 6 2 12 2 16 7 20 3 23 2 25 8 28 1 30 1 32 0 34 29 5 1 9 7 8 13 9 18 5 22 1 25 1 27 7 30 0 32 1 34 0 36 28 3...

Страница 34: ...r supply User Manual This chapter covers Unpacking the laser system Laser head setup Chiller setup Connections to the laser head First Time Laser Power up procedure Daily operation Output power control External triggering and FPS The purchaser is responsible for any loss and injury during installation and use of the laser system Northrop Grumman recommends that a qualified service technician insta...

Страница 35: ...he unit needs to be returned for service the specially designed carton assures adequate protection Laser Head Setup The laser head should be mounted on an optical table or equivalent strong flat surface Three mounting holes are provided to secure the laser The laser should be installed in a clean environment A power meter with the ability to handle a minimum of 30 W should be installed approximate...

Страница 36: ... laser head Water Hoses and Filter Connections The required water hoses filters and fittings are included in the plumbing kit that was shipped with the laser They should be connected as illustrated in Figure 4 2 The correct water flow path starts with the supply port of the chiller filter coolant in port of laser head laser head coolant out port of laser head return port of the chiller Please be a...

Страница 37: ...eration 2019 Cutting Edge Optronics Inc 24 Iklwa Laser User Manual Approved for Public Release NG19 2099 CEO UMAN 0055E Figure 4 3 depicts the chiller with connected water hoses Figure 4 3 Chiller Assembled with Water Hoses and Filter ...

Страница 38: ...EO UMAN 0055E Connections to the Laser Head Figures 4 4 and 4 5 depict the connectors on the rear panel of the Iklwa laser All of the connectors are clearly labeled Figure 4 4 Connectors on the rear panel of the Iklwa laser Gen I Figure 4 5 Connectors on the rear panel of the Iklwa laser Gen II Follow these steps to connect the laser head ...

Страница 39: ...push the barb fittings of water hose connectors gently into the COOLANT IN and COOLANT OUT ports by following the flow path direction Wetting the o rings of the quick disconnect fittings and receptacles can prevent the o ring from being damaged Make sure that the quick disconnect fittings are locked by listening for a clicking sound Figure 4 6 Plumbing Connection Gen I Figure 4 7 Plumbing Connecti...

Страница 40: ...NG19 2099 CEO UMAN 0055E 2 Connect RF Cable Connect the Q switch RF cable to the BNC connector on the laser head see Figures 4 8 and 4 9 Once aligned the connector can be pushed in Turn the locking ring of the connector in the clockwise direction until it is locked Figure 4 8 RF Connection Gen I Figure 4 9 RF Connection Gen II ...

Страница 41: ... 3 Connect diode power Connect the female connector of the diode power cable to the J2 connector on the laser head see Figures 4 10 and 4 11 Once aligned the connector can be pushed in Turn the locking ring of the connector in the clockwise direction until it is locked Figure 4 10 Diode Power Connection Gen I Figure 4 11 Diode Power Connection Gen II ...

Страница 42: ...AN 0055E 4 Connect laser signal Align the female connector of the laser signal cable to the J1 connector on the laser head Once aligned the connector can be pushed in Turn the locking ring of the connector in the clockwise direction until it is locked as shown in Figures 4 12 and 4 13 Figure 4 12 Signal Connection Figure 4 13 Signal Connection ...

Страница 43: ... the chiller until it matches the flow rate recorded in the test report 4 Run the chiller for approximately half an hour to allow it to stabilize at the set temperature WARNING Do not operate coolant system below air condensation temperature dew point at the laser head Condensation on the diode arrays can seriously damage the laser head TEC Controller 1 Verify that all connections from the laser t...

Страница 44: ...ly the laser needs optimization for the first installation due to the slight differences of environments chiller settings and vibration of the transportation If so please follow the laser performances optimization procedures Chapter 5 Maintenance Daily Operation Output energy and repetition rate of the Iklwa laser system are adjustable over a wide range However operating protocols must be observed...

Страница 45: ...rmal lensing Therefore the position of the focal point moves as the pump current is varied This is not desirable for most laser applications especially laser micro machining The output power of Iklwa laser can be changed either by changing the operating current or by changing the Q switch power This unique patented technology allows users to adjust the laser output power continuously without chang...

Страница 46: ...parameters for FPS have to be set properly Failure to suppress the first giant pulse may cause the internal optical damage as well as damage to the work piece For each type of laser processing a particular operating current and pulse repetition rate are needed The giant pulse can be suppressed by enabling FPS and setting the proper FPS parameters To set the FPS properly use a photodiode detect wit...

Страница 47: ... for Public Release NG19 2099 CEO UMAN 0055E Chapter 5 Maintenance The chapter contains information in these sections Prepare for shipment Purge housing Replace desiccant cartridge Maintain chiller Check hold off Extend lifetime of laser diodes Optimize laser performance ...

Страница 48: ...led ESD bag with a desiccant Package the laser securely in a shipping container All water will need to be removed from the chiller prior to shipment Refer to the chiller manufacturer s instructions Do not reconnect chiller lines to laser prior to shipment After shipment if antifreeze was used drain and clean the chiller Add a new filter and clean Optishield Plus coolant before reconnecting the chi...

Страница 49: ...ll absorb water When all three sectors of the indicator paper turn completely white or light pink the module has absorbed all the water it can and must be replaced Replacement frequency varies with the humidity in the operating environment and if the laser head is opened If the desiccant cartridges are exhausted in a short time frame e g 2 weeks without the laser head having been opened contact No...

Страница 50: ...hrop Grumman CEO or directly from AGM Container Controls Inc telephone number 800 995 5590 Desiccant cartridge Northrop Grumman CEO part no 42 228 Refill part number 643665 Refill tool 980412 No cartridge installation tool is needed The 40 gram desiccant cartridge is hand tightened 5 Gram Contact Northrop Grumman for details WARNING Do not operate the laser without a functional desiccant cartridge...

Страница 51: ...rovided in the final test report delivered with the system During its early lifetime the laser diodes will deliver this specified power at or below the preset current limit As the diodes age an increase in current may be required to maintain power and beam quality so the diodes can continue to be used Once the maximum current of 30 A is reached consider replacing diodes or upgrade the laser Please...

Страница 52: ...ler Beginning with the TEC Temperature from the ATP Test Report adjust the temperature up and down to optimize WARNING To prevent damaging the HM mirror and LBO crystal the laser output power should not decrease more than 10 when adjusting the TEC Temperature The phase matching of the SHG crystal is crucial for the Iklwa laser This is achieved by setting the proper temperature on the SHG crystal w...

Страница 53: ...ate for the aging of the system s laser diodes Figure 5 6 Example of Laser Performance Dependence on the Operating Current 5 Peak up the laser with adjustment of the cavity mirrors WARNING Making mirror adjustments can be non reversible Do this step only when all the steps above have been completed and the laser does not meet the specifications with the correct settings a Locate the access holes f...

Страница 54: ...e is no significant performance improvement If the laser is still not within 5 of the original power or not stable repeat the steps of TEC optimization current optimization and HM HR adjustment until there is no significant performance improvement If the laser power can t be restored to the specification or the laser is not stable then the walking the cavity procedure can be tried Walking the cavi...

Страница 55: ...the same procedure with the vertical adjustments of the HM and HR mount Typically SHG temperature adjustment is not needed when adjusting vertically Periodically check for hold off when making these adjustments see in the Check Hold Off section in Chapter 5 Maintenance If laser power is within 5 percent of nominal typical power meter accuracy and it has good beam shape and stability stop and repla...

Страница 56: ... NG19 2099 CEO UMAN 0055E Chapter 6 Customer Service When calling for service in the U S dial 636 916 4900 To phone for service in other countries contact the sales agent This chapter provides reference to types of customer service needs Module replacement Return the instrument for repair ...

Страница 57: ...a local distributor for RMA and shipping instructions CAUTION Failure to obtain proper shipping instructions may result in damage to the instrument Use the packing boxes supplied by Northrop Grumman to ship any instruments If shipping boxes have been lost or destroyed replacements are available for a nominal charge from Northrop Grumman Remove all water from laser prior to packaging for shipment s...

Страница 58: ...to provide possible solutions to common problems encountered with the Iklwa laser during normal use For more information please see the troubleshooting guide that is on the owner s manual CD supplied with the laser The following sections can be found in this chapter Initial checklist Laser output power WARNING Do not attempt repairs while the unit is under warranty ...

Страница 59: ...tability before making any adjustments Only after verifying these conditions should an attempt be made to make adjustments to the laser system Laser Output Power Low Output Power 0 01 W 16 W Low Q switch power Check the setting of the Q switch driver The typical RF driver power is 25W Low RF power will cause the laser to lose hold off and decrease the laser output power High RF power will cause lo...

Страница 60: ...e No Output Power Verify the operating current is set at the operation point Verify the Q switch is set to hold off and the laser is triggered at preset PRF with an internal or external triggering source Verify the shutter is open Verify there are no interlock warning messages Verify the Q Switch controller settings Laser Flicker When the external perturbations are applied to the laser system the ...

Страница 61: ... procedures as described in the Optimize Laser Performance section in Chapter 5 Maintenance to optimize laser output power and beam profile After optimization the beam profile and laser output power may be restored at a higher operating current and the laser threshold may be higher as well This is normal for aging laser diodes see the Optimize Laser Performance section of Chapter 5 Maintenance Fai...

Страница 62: ...tion of the output laser beam but only damaged optics inside the laser cavity will increase the threshold current Verify laser output window and all external optics are clean and free of damage If no damage is found move the laser to a clean room environment and remove the cover Inspect all optics including the diode module rod Internal optical damage to the laser contaminated rod or aging diodes ...

Страница 63: ...ymbol Abbrv Prefixes mass gram g tera 1012 T length meter m giga 109 G time second s mega 106 M frequency Hertz Hz kilo 103 k force Newton N deci 10 1 d energy Joule J centi 10 2 c power Watt W milli 10 3 m electric current Ampere A micro 10 6 µ electric charge Coulomb C nano 10 9 n electric potential Volt V pico 10 12 p resistance ohm Ω femto 10 15 f inductance Henry H atto 10 18 a magnetic flux ...

Страница 64: ...ards Institute AO Acousto optic AR Anti Reflective ATP Acceptance Test Procedure CDRH Center for Devices and Radiological Health CW Continuous Wave FPS First Pulse Suppression HeNe Helium Neon HM Harmonic Mirror HR High Reflection IEC International Electrotechnical Commission LBO Lithium Triborate N2 Nitrogen Nd YAG Neodymium Doped Yttrium Aluminum Garnet nm Nanometer OSHA Occupational Safety and ...

Страница 65: ...e NG19 2099 CEO UMAN 0055E Acronym Description PSI Pounds per Square Inch RF Radio Frequency RH Relative Humidity RMS Root Mean Square SHG Second Harmonic Generator TEC Thermal Electric Cooler TEM00 Transverse Electromagnetic Mode TTL Transistor Transistor Logic UV Ultraviolet VAC Volts Alternating Current ...

Страница 66: ... Housing Front Panel 12 Purge 36 Rear Panel 12 13 15 16 26 27 29 Top Panel 14 HR Mirror 13 42 43 Humidity Sensor 15 Interlocks 48 Cover 5 15 Knowledge Center ii Laser Diodes 2 4 5 19 20 29 33 39 41 45 47 48 49 Laser on Indicator 5 15 Laser Optimization 32 39 42 48 49 Laser Safety Emission v Equipment 9 ESD v 8 36 45 Exposure 8 Eye Protection 8 9 13 31 32 Shock Hazard vi Voltage 8 Warning Labels 10...

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