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Summary of Contents for Spectra-Physics 3980
- Page 1 Model 3980 Frequency Doubler and Pulse Selector User’s Manual The Solid-State Laser Company 1335 Terra Bella Avenue Mountain View, CA 94043 Part Number 0000-288A, Rev. C August 2002...
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Page 3: Preface
Model 3980 frequency doubler/pulse selec- tor on a day-to-day basis. The “Introduction” chapter contains a brief description of the Model 3980. This is followed by an important chapter on laser safety. The Model 3980 is ® designed for use with a Spectra-Physics Tsunami mode-locked Ti:sap- ®... -
Page 5: Table Of Contents
Unpacking Your Model 3980........ - Page 6 Converting from a Picosecond Model 3980-3 to a Model 3980-5 Femtosecond Pulse Selector Only Unit ......5-16 Chapter 6: Operation.
- Page 7 List of Figures Figure 1-1: The Model 3980 Frequency Doubler/Pulse Selector ......1-1 Figure 1-2: Model 3980 Schematic and Optical Beam Path .
- Page 8 Table 3-1: Model 3980-1 ps Frequency Doubler Performance ......3-8 Table 3-2: Model 3980-4 fs Frequency Doubler Performance .......3-8 Table 3-3: Model 3980-2 ps Pulse Selector Performance .
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Page 9: Warning Conventions
Warning Conventions The following warnings are used throughout this manual to draw your attention to situations or procedures that require extra attention. They warn of hazards to your health, damage to equipment, sensitive procedures, and exceptional circumstances. All messages are set apart by a thin line above and below the text as shown here. -
Page 11: Standard Units
Standard Units The following units, abbreviations, and prefixes are used in this Spectra- Physics manual: Quantity Unit Abbreviation mass kilogram length meter time second frequency hertz force newton energy joule power watt electric current ampere electric charge coulomb electric potential volt Ω... -
Page 13: Unpacking And Inspection
Accessory kit (see below) Verify these components are present. They are all shipped in one container. Accessory Kit Included with the Model 3980 is this manual, a packing slip listing all the parts shipped, and an accessory kit containing the following items: •... - Page 14 Model 3980 Frequency Doubler/Pulse Selector ™ • a packet of Kodak Lens Cleaning Paper • an external 3 db attenuator • a set of 38 mm lenses if you purchased a pulse selector system and a 75 mm lens if you purchased a fs frequency doubler/pulse selector sys- tem.
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Page 15: Chapter 1: Introduction
Chapter 1 Introduction The Spectra-Physics Model 3980 frequency doubler/pulse selector (Figure 1-1) is designed to operate as a companion product to the Spectra-Physics ® Tsunami mode-locked Ti:sapphire laser product. Overview System Components The following components comprise the Model 3980 frequency doubler/ pulse selector: •... -
Page 16: Figure 1-2: Model 3980 Schematic And Optical Beam Path
Model 3980 Frequency Doubler/Pulse Selector Because of its modular design, the Model 3980 is available in several con- figurations: as a frequency doubler only, a pulse selector only, or both. Each combination can be set up for either fs or ps operation. A system ini- tially purchased with a single function can be economically upgraded to include the other at any time. -
Page 17: Understanding The Model Numbers
Introduction Figure 1-2 shows a Model 3980 containing both a frequency doubler and a pulse selector, each on separate platforms. There are two input ports and three output ports. In practice, only the pulse selector input port is used. This allows the Model 3980 to be butted against the Tsunami laser output bezel to save table space and preserve a collinear alignment of the two enclosures. - Page 18 Model 3980 Frequency Doubler/Pulse Selector...
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Page 19: Chapter 2 Laser Safety
• Use an infrared detector or energy detector to verify that the laser beam is off before working in front of the laser or the Model 3980. • Operate the laser at the lowest beam intensity possible, given the requirements of the application. -
Page 20: Figure 2-2: Folded Metal Beam Target
Model 3980 Frequency Doubler/Pulse Selector • Set up experiments so the laser beam is either above or below eye level. • Provide enclosures for beam paths whenever possible. • Set up shields to prevent specular reflections. • Set up an energy absorbing target to capture the laser beam, preventing unnecessary reflections or scattering (Figure 2-2). -
Page 21: Safety Devices
Laser Safety Safety Devices Interlock Shutter Figure 2-3 shows the Model 3980 interlock shutter. The cover holds the shutter open during normal operation. When you remove the cover, the shutter closes automatically, blocking the laser beam. When the cover is off the unit and you need to access the beam, you must raise the red shutter lever to hold the shutter “open.”... -
Page 22: Maintenance Required To Keep This Laser Product In Compliance With Center For Devices And Radio Logical Health (Cdrh) Regulations
This maintenance is to be performed by the user, as out lined below. 1. Verify that removing the Model 3980 cover closes the shutter and blocks the beam. 2. Verify that, when the cover interlock is defeated (the shutter override), the defeat mechanism is clearly visible and prevents installation of the cover until it is disengaged. -
Page 23: Ce/Cdrh Warning Labels
VISIBLE ALIGNMENT. BLOCK INCOM- AND INVISIBLE* LASER RADIATION IS ING BEAM WHEN CLEANING EMITTED FROM THIS APERTURE *SEE MANUAL *SEE MANUAL OR REPLACING OPTICS. B424-685 AVOID EXPOSURE Caution-Safety Label (6) Aperture Label (5) Figure 2-4: Model 3980 CE/CDRH Warning Labels... -
Page 24: Label Translations
Model 3980 Frequency Doubler/Pulse Selector Label Translations For safety, the following translations are provided for non-English speak- ing personnel. The number in parenthesis in the first column corresponds to the label number listed on the previous page. Table 2-1: Label Translations... -
Page 25: Ce Declaration Of Conformity (Emissions)
Mountain View, CA. 94039-7013 United States of America declare under sole responsibility that the: Model 3980 Frequency Doubler and Pulse Selector manufactured after June 18, 2001, Meets the intent of “Directive 89/336/EEC for Electromagnetic Compatibility.” Compliance was demonstrated (Class A) to the following specifications as listed... -
Page 26: Ce Declaration Of Conformity (Safety)
Mountain View, CA. 94039-7013 United States of America declare under sole responsibility that the: Model 3980 Frequency Doubler and Pulse Selector manufactured after January 1, 2000, Meets the intent of “Directive 73/23/EEC for Product Safety.” Compliance was demonstrated to the following specifications as listed in the... -
Page 27: Sources For Additional Information
Laser Safety Sources for Additional Information The following are some sources for additional information on laser safety standards, safety equipment, and training. Laser Safety Standards Safe Use of Lasers (Z136.1: 1993) American National Standards Institute ( ANSI 11 West 42 Street New York, NY 10036 Tel: (212) 642-4900... -
Page 28: Equipment And Training
Model 3980 Frequency Doubler/Pulse Selector Equipment and Training Laser Safety Guide Laser Institute of America 12424 Research Parkway, Suite 125 Orlando, FL 32826 Tel: (407) 380-1553 Laser Focus World Buyer's Guide Laser Focus World Penwell Publishing 10 Tara Blvd., 5... -
Page 29: Chapter 3: Description
Laser Description The Model 3980 frequency doubler/pulse selector was briefly described in Chapter 1. In this chapter, we discus, in detail, how the Model 3980 pro- vides frequency doubling and how the pulse selector works. Specifications and outline drawings are provided at the end of this chapter. -
Page 30: Picosecond Frequency Doubling
For optimum performance, it is tem- perature stabilized. Because of the high acceptance angle of and beam shaping within the doubler optical path, the Model 3980 maintains good output beam symmetry. In a ps system, an -coated silica compensating... -
Page 31: Femtosecond Frequency Doubling
Laser Description Femtosecond Frequency Doubling To minimize pulse broadening due to group velocity dispersion ( ) in a fs system, it is necessary to employ a thin crystal to obtain short, sec- ond harmonic output pulses. However, in order to maintain high conversion efficiencies, this necessitates (a) using rather than as the... -
Page 32: Maintaining Good Beam Size
For convenience, in the Model 3980 we utilize the m = –1 diffracted beam and employ a beam block to capture the low power undif- fracted beam. -
Page 33: Protecting The Aom
Laser Description Protecting the AOM in the Model 3980 can be damaged with optical power > 1 . While this means the system can be safely operated with ps input pulses, for fs systems suitable precautions must be employed to pre- vent damage to the Bragg cell. -
Page 34: Changing Optics
Figure 3-3: Output pulse width from the as a function of input pulse width. Changing Optics Because every optical element in the Model 3980 frequency doublers is either coated, it is necessary to replace each optical element when changing between tuning ranges 690–840 nm and 840–1080 nm... - Page 35 ≈ 40 MHz. An internal oscillator is provided for stand-alone unit test- ing. The optical pulses selected may be frequency doubled using the Model 3980 options described in “Understanding the Model Numbers” earlier in this chapter. The doubling crystal temperature control electronics are included in the Model 3986.
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Page 36: Performance Specifications
<1.5 mrad <1.5 mrad <1.5 mrad Specifications subject to change without notice and only apply when the Model 3980 is used in conjunction with a Tsu- nami ® laser pumped by a Spectra-Physics Millennia Vs, VIIIs, or Xs solid state laser. -
Page 37: Table 3-3: Model 3980-2 Ps Pulse Selector Performance
Tuning range 345–420 nm 360–450 nm 420–540 nm Specifications subject to change without notice and only apply when the Model 3980 is used in conjunction with a Tsunami laser pumped by a Spectra-Physics Millennia ® Vs, VIIIs or Xs solid-state laser. -
Page 38: Table 3-6: Model 3980-5 Fs Pulse Selector Performance
Tuning range 345–420 nm 360–450 nm 420–540 nm Specifications subject to change without notice and only apply when the Model 3980 is used in conjunction with a ® Tsunami laser pumped by a Spectra-Physics Millennia Vs, VIIIs or Xs solid-state laser. -
Page 39: Figure 3-4: Typical Frequency-Doubled, Tsunami Ps Tuning Curves Using 10 W Tem
90 to 250 Vac, 3.15AH 250 VA Model 3983 100/120 Vac @ 0.125 A 250 V or 220/240 Vac @ 0.25 A 250 V Weight Model 3980 16.0 kg (35.4 lb) Model 3986 11.0 kg (24.3 lb) Model 3983 2.3 kg (5.0 lb) -
Page 40: Outline Drawings
11.00 8.00 (20.32) (27.94) 5.22 HEATER ON (13.26) FREQUENCY DOUBLER Model 3983 (2.06) Model 3983 (Front View) Model 3983 (Side View) All dimensions in inches (cm) Figure 3-6: Outline Dimensions for the Model 3980, Model 3986, and Model 3983 3-12... -
Page 41: Chapter 4: Controls, Indicators, And Connections
Chapter 4 Controls, Indicators and Connections Optical Unit External Controls The external controls are described from left to right, top to bottom as they are shown in Figure 4-1. SHG Crystal Angle Selected Fundamental Micrometer Adjust Fundamental Output Output SELECTED SECOND FUNDAMENTAL OPTIONAL INPUT... -
Page 42: General Purpose Controls
Foot adjust (3)—moves the feet up and down to adjusts the tilt and height of the Model 3980. There is one foot in each corner on the input side, and one centered on the output side. Each foot screws up and down in the bot- tom cover and is locked in place by a jam nut (ring) located on the foot just under the cover. -
Page 43: Pulse Selector Controls
1.3:1 beam expanding telescope when the Model 3980 is configured for use as a fs frequency doubler. Acousto-optic modulator ( )—diffracts the optical beam by means of the Bragg effect when an rf-generated acoustic wave interacts with the opti- cal beam. -
Page 44: Figure 4-4: Aom And Controls
(Figure 4-3). is also used in conjunction with as a 1.3:1 beam expanding telescope when the Model 3980 is configured for use as a fs frequency doubler. has the same adjustments as (refer to “Focusing lens “above). -
Page 45: Frequency Doubler Controls
FUNDAMENTAL OUTPUT Model 3980 chassis (Figure 4-2). To remove or replace the optic, pull back on the spring clip holding it in place; you do not need to remove the entire mount. - Page 46 Model 3980 Frequency Doubler/Pulse Selector The micrometer adjust that extends through the top cover rotates the crystal to optimize the frequency-doubled output. If the beam becomes clipped while using this adjustment, the small screw next to the crystal may be loosened and the crystal manually moved so that the beam is no longer clipped.
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Page 47: Model 3986 Electronics Unit
Controls, Indicators and Connections Model 3986 Electronics Unit The controls are described from left to right, top to bottom. Front Panel Controls DIVIDER RATIO PHASE PHASE LOCK 500 800 1.6K EXT. HEATER ON DELAY RF POWER RF ON MODEL 3986 FREQUENCY DOUBLER PULSE SELECTOR POWER... -
Page 48: Rear Panel Controls And Connections
Model 3980 Frequency Doubler/Pulse Selector mode allows external pulse control. See “ connector” EXT TRIG IN under the “Rear Panel Controls and Connections” section below for the definition of, and requirements for, external signals. control—sets the amount of pulse power... -
Page 49: Figure 4-8: Aom Driver Schematic Block Diagram
Terminate with 50 Ω . connector—connects to the 9-pin heater connector on the Model HEATER 3980 when a ps frequency doubler is present, and it provides power to and sensor signals from the crystal heater. -
Page 50: Model 3983 Electronics Unit
Model 3980 Frequency Doubler/Pulse Selector connector ( )—provides connection for the rf drive sig- RF OUT nal (into a 50 Ω matching network). A 3 db attenuator is usually connected between the unit and the cable. This reduces the rf level to the AOM, which... -
Page 51: Rear Panel Controls And Connectors
Power Connector Voltage Setting Figure 4-10: Model 3983 Rear Panel Heater connector—connects to the 9-pin heater connector on the Model 3980 output bezel, and provides power to and sensor signals from the crystal heater. Power on/off switch—applies power to the system if the power cord is connected to your facility power source. - Page 52 Model 3980 Frequency Doubler/Pulse Selector 4-12...
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Page 53: Chapter 5 Installation And Alignment
Allow only those qualified and authorized by Spectra-Physics to install and set up your Model 3980. You will be charged for repair of any damage incurred if you attempt to install the system yourself, and such action may void your warranty. -
Page 54: Required Equipment
Model 3980 Frequency Doubler/Pulse Selector Required Equipment The following equipment is required to perform an alignment of the Model 3980 system. If these items are not available, equivalent items can be used. • Photodiode from Electro Technology ET2000 • Tektronix... - Page 55 Steps 10 through 18 involve setting up the Model 3986 or 3983 electronics unit. If you have a Model 3980-4 and, thus, no electronic unit, skip to Step 10. Place the Model 3986 or Model 3983 electronics unit close to the Model 3980 optical unit.
- Page 56 20. Open the Model 3980 shutter. Pull up on the red-tipped shutter lever. 21. Move the Model 3980 into the Tsunami output beam and adjust its feet height and side to side position so the beam passes through the center...
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Page 57: Pulse Selector Installation
38 mm set. If yours is a fs unit with a frequency doubler, it also includes a 75 mm lens. Ps and fs systems with only a pulse selector (Models 3980-2 and -5) are optimized and shipped with the 50 mm lenses installed for use with wave- lengths <1000 nm. -
Page 58: Figure 5-1: The Pulse Selector Platform
Model 3980 Frequency Doubler/Pulse Selector Table 5-1: Lens Selection System Type Picosecond System Femtosecond System Wavelength Used <1000 nm >1000 nm <1000 nm >1000 nm Lens (mm) Pulse Selector Only Frequency Doubler absent absent absent absent Only (50)* (50)* 38)*... - Page 59 Installation and Alignment Use an ir viewer to scan the optical surfaces of the and adjust the so that the beam passes through the vertically centered and approximately 1 to 2 mm from the transducer side (the side nearest the horizontal control knob).
- Page 60 Model 3980 Frequency Doubler/Pulse Selector 14. Place an ir card in front of the beam block, and adjust the verti- cally, first to yield a –1 order diffracted beam, then to maximize that beam. The –1 order beam is located just to the right of the undiffracted zeroth...
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Page 61: Frequency Doubler Installation: Part I-For Systems Without Or Not Using The Pulse Selector
(ps systems only) and the crystal, and center it on focusing mirror The next step is performed by your Spectra-Physics service representative during the initial installation and should not need to be done by you. -
Page 62: Figure 5-3: The Frequency Doubler Platform
Model 3980 Frequency Doubler/Pulse Selector Remove the lock-down screws from the crystal mount assembly and the compensator assembly (if present). Models 3980-4, and -6 have no compensator assembly. Caution! The lock-down screws secure the two mounts to the base plate during shipping. -
Page 63: Converting Your System
Position where the image loses its elliptical shape and becomes round, then tighten the screw. This completes the installation and alignment of your Model 3980. Converting Your System Detailed instructions are included with the upgrade conversion kit(s) for installing either a pulse selector or frequency doubler platform. Do not dis- card these instructions. -
Page 64: Table 5-2: System Conversions For The 3980
Model 3980 Frequency Doubler/Pulse Selector Table 5-2: System Conversions for the 3980 Picosecond System Femtosecond System → FD + PS FD + PS From↓ PS platform add PS platform add PS platform add L PS platform add PS platform add... - Page 65 Converting from a Picosecond Model 3980-2 to a Model 3980-5 Femtosecond Pulse Selector Changing from a Model 3980-2 to a -5 or from a Model 3980-3 to a -6 with the frequency doubler present, requires that you move the pulse stretcher into the beam path.
- Page 66 Model 3980 Frequency Doubler/Pulse Selector 3. If you are converting a Model 3980-6 to a -3 (i.e., you need to use the frequency doubler), you need to refer to “Converting From a Femto- second to a Picosecond Frequency Doubler” below: there are several other changes you need to make.
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Page 67: Converting From A Femtosecond Model 3980-6 To A Model 3980-4 Femtosecond Frequency Doubler Only Unit
Optimize spacing for best frequency doubling and collima- tion. Converting from a Femtosecond Model 3980-6 to a Model 3980-4 Femtosecond Frequency Doubler Only Unit Translate the horizontally so that the beam does not pass through the Bragg cell, then move the pulse stretcher out of the beam path. -
Page 68: Converting From A Picosecond Model 3980-3 To A Model 3980-5 Femtosecond Pulse Selector Only Unit
Change the frequency doubler crystal and optimize the focus for best frequency doubling output power. Converting from a Picosecond Model 3980-3 to a Model 3980-5 Femtosecond Pulse Selector Only Unit Move the pulse stretcher back into the beam path before using the pulse... -
Page 69: Chapter 6: Operation
Chapter 6 Operation Start-up Once installed, the Model 3980 can be operated on a day-to-day basis as outlined below. Provided nothing is disturbed between operating sessions, only minor adjustments are required to maintain optimum performance. To modify or convert your system from a picosecond (ps) to a femtosecond... -
Page 70: Shut-Down
All Models Except Model 3980-4 Turn off the electronics unit. Model 3980-4 There is no shut down procedure for the Model 3980-4. Follow the instructions in your Tsunami and pump laser manuals for shutting down those systems. This concludes the shut-down procedure. -
Page 71: Changing Optics
Operation Changing Optics Replace optics one at a time, and follow the directions in Chapter 5, “Installation and Alignment,” for aligning each optic. Refer to the “Replacement Parts List” in Chapter 8 for optic part numbers and their positions. System Conversions Refer to Chapter 5, “Installation and Alignment: Converting Your System.”... - Page 72 Model 3980 Frequency Doubler/Pulse Selector...
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Page 73: Chapter 7: Maintenance
The cleaner the environment, the slower the rate of contamination. If the cover of the Model 3980 is left in place, there is little you must do day-to-day to maintain the unit. When you finally do need to clean the optics, follow the procedures below. -
Page 74: General Procedures For Cleaning Optics
Model 3980 Frequency Doubler/Pulse Selector • Work in a clean environment and, whenever possible, over a soft, lint- free cloth or pad. • Wash your hands thoroughly with liquid detergent. Body oils and contaminants can render otherwise fastidious cleaning practices useless. -
Page 75: Cleaning The Aom
Resort to cleaning ® only after verifying the Tsunami laser meets output specifications and all other Model 3980 optics are clean. Warning! The AOM is extremely fragile. Do not use pressurized air other than that from a squeeze bulb on the . -
Page 76: Cleaning The Shg Crystal
Model 3980 Frequency Doubler/Pulse Selector Warning! The beam must never come in contact with the transducer ele- ment, its base or its wires. If this occurs, these elements will be immedi- ately destroyed. The position of the shield is factory set to block the input beam from contacting the transducer element. -
Page 77: Chapter 8: Service And Repair
Refer to Figure 3-1for component placement in the Model 3980 optical unit. If following the troubleshooting suggestions fail to return your Model 3980 to normal operation, call your Spectra-Physics service representative for assistance. - Page 78 Increase or decrease rf power with the RF POWER control. Misaligned acousto-optic modulator. If the alignment of the Model 3980 to the input beam is correct, set the repetition rate to CW, RF POWER to maximum and, using the position controls of the modulator, maximize the –1 order diffracted beam.
- Page 79 J on the pc board, and attach the heater from the pc board to the frequency-dou- bler crystal in the Model 3980 is discon- cable from the SHG crystal to the pc board as well. nected. Note: verify the ac power is off before removing the top cover from the electronics module or before plugging in any cable.
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Page 80: Replacement Parts
Model 3980 Frequency Doubler/Pulse Selector Replacement Parts The following tables contain component part numbers for items you may have damaged or lost. Table 8-1: Replacement Parts, Frequency Doubler Component 720–900 nm 840–1080 nm Part Number Part Number Routing Mirror G0072-028... -
Page 81: Chapter 9 Customer Service
Chapter 9 Customer Service At Spectra-Physics, we take great pride in the reliability of our products. We place considerable emphasis on controlled manufacturing methods and quality control throughout the manufacturing process. Nevertheless, even the finest precision instruments will need occasional service. We feel that... -
Page 82: Return Of The Instrument For Repair
Spectra-Physics. When products manufactured by others are included in Spectra-Physics equipment, the original manufacturer's war- ranty is extended to Spectra-Physics customers. When products manufac- tured by others are used in conjunction with Spectra-Physics equipment, this warranty is extended only to the equipment manufactured by Spectra- Physics. -
Page 83: Service Centers
Customer Service Service Centers Benelux Telephone: (31) 40 265 99 59 France Telephone: (33) 1-69 18 63 10 Germany and Export Countries Spectra-Physics GmbH Guerickeweg 7 D-64291 Darmstadt Telephone: (49) 06151 708-0 Fax: (49) 06151 79102 Japan (East) Spectra-Physics KK... - Page 84 Model 3980 Frequency Doubler/Pulse Selector...
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Page 85: Appendix A: Selecting Proper Line Voltage
Appendix A Selecting Proper Line Voltage The Model 3986 has an autoswitching line input of 90 to 250 Vac and needs no setting. However, the Model 3983 is not autoswitching and its line voltage switch (part of the power connector) must be set to match your facility line voltage. - Page 86 Model 3980 Frequency Doubler/Pulse Selector 3. Verify the correct fuse is installed: Facility Line Voltage Model 3983 Fuse 100 to 120 V 0.25 A slow blow 220 to 240 V 0.125 A slow blow 4. Select the voltage. There are four voltage selections, one written on each edge of the pc board with a small arrow pointing to it.
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Page 87: Appendix B Optimizing The Tsunami Laser Output
Recommended Equipment You must have the proper equipment to measure fs pulses from a Model 3980 with a pulse selector, (a) in order to maximize pulse bandwidth and create short pulses, (b) have the pulse stretcher work effectively, and (c) -
Page 88: Optimizing Femtosecond Tsunami Laser Output
Tsunami laser meets specifications. If, after performing Steps 1 through 3, your Tsunami laser still does not meet specifications, call your Spectra-Physics service representative. Refer to Chapter 9, “Customer Service,” in this manual for the location and phone number of your nearest Spectra-Physics service center. -
Page 89: Notes
Notes Notes-1... - Page 90 Model 3980 Frequency Doubler/Pulse Selector Notes-2...
- Page 91 Notes Notes-3...
- Page 92 Model 3980 Frequency Doubler/Pulse Selector Notes-4...
- Page 93 Notes Notes-5...
- Page 94 Model 3980 Frequency Doubler/Pulse Selector Notes-6...
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Page 95: Report Form For Problems And Solutions
We have provided this form to encourage you to tell us about any difficulties you have experienced in using your Spectra-Physics instrument or its manual—problems that did not require a formal call or letter to our service department, but that you feel should be remedied. We are always interested in improving our products and manuals, and we appreciate all suggestions.
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