Burleigh WAVEMETER JR WA-2500 Manuel utilisateur

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WA-2500 WAVEMETERJR

OPERATING MANUAL

Operating Manual (Rev. E)

04659-M-00

Wavemeter is a registered trademark of Burleigh Instruments Inc.

Burleigh Instruments, Inc.

Burleigh Park

P.O. Box E

Fishers, NY 14453-0755

Tel: (716) 924-9355

Fax: (716) 924-9072

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TABLE OF CONTENTS

1. INTRODUCTION....................................................................................................... 1-1

1.1 APPLICATIONS ............................................................................................................... 1-1

1.2 THEORY OF OPERATION .............................................................................................. 1-1

2. INITIAL INSPECTION............................................................................................... 2-1

2.1 VISUAL INSPECTION ..................................................................................................... 2-1

2.2 OPERATIONAL INSPECTION......................................................................................... 2-1

3. OPERATING INSTRUCTIONS ................................................................................. 3-1

3.1 INITIAL SET UP ...............................................................................................................3-1

3.2 BEAM RECEIVER MOUNTING ....................................................................................... 3-1

3.3 BEAM RECEIVER ALIGNMENT...................................................................................... 3-2

3.4 BAR-GRAPH INTENSITY METER .................................................................................. 3-4

3.5 UNITS SELECTION ......................................................................................................... 3-4

3.6 AVERAGE MODE ............................................................................................................ 3-4

3.7 CALIBRATION FUNCTION.............................................................................................. 3-5

3.8 MONITOR, TRIGGER AND WINDOW OUTPUTS ......................................................... 3-5

3.9 AUTO-RESOLUTION FEATURE..................................................................................... 3-6

3.10 RS-232 INTERFACE........................................................................................................ 3-8

3.11 INTERFEROMETER ALIGNMENT.................................................................................. 3-9

3.12 DETECTOR INTERCHANGE .......................................................................................... 3-13

3.13 100 VAC Operation .......................................................................................................... 3-14

3.14 Operation with Mode-locked and Other Low Coherence Lasers ..................................... 3-15

4. MAINTENANCE AND SERVICE............................................................................... 4-1

4.1 Error Messages................................................................................................................ 4-1

4.2 TROUBLESHOOTING ..................................................................................................... 4-2

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4.3 Changing the Line Voltage ............................................................................................... 4-3

4.4 Changing the Fuse........................................................................................................... 4-3

5. ACCESSORIES ........................................................................................................ 5-1

5.1 Recommended Mounts.................................................................................................... 5-1

5.2 Optional Components ...................................................................................................... 5-2

6. SPECIFICATIONS .................................................................................................... 6-1

7. WARRANTY ............................................................................................................. 7-1

APPENDIX A. SAMPLE PROGRAM ...................................................................................... A-1

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Wavemeterjr Operating Manual 1. Introduction

Burleigh Instruments, Inc. (04659-M-00 Rev E) page 1-1

Burleigh Park, Fishers, NY 14453

1. INTRODUCTION

1.1 APPLICATIONS

The WA-2500 Wavemeterjr is an instrument for wavelength measurement of CW

laser sources that combines accuracy with ease of use. The accuracy is ±1 part in

10,000 over the full wavelength range.

The primary application for Model WA-2500 is measurement of the wavelength or

the frequency of tunable lasers that operate from 400 to 1800 nanometers,

particularly dye lasers, Ti:Sapphire lasers and diode lasers. Two detectors are

provided to cover this range with high sensitivity. The VIS detector is used for

lasers operating from 400 to 1100 nanometers, and the IR detector for lasers that

operate from 600 to 1800 nanometers.

1.2 THEORY OF OPERATION

Laser light enters the Wavemeterjr through a fiber optic cable. Lasers that emit a

collimated beam can be easily coupled into the fiber by a beam receiver consisting of

an Input Beam Coupler (BC-1) and an FC connector terminated 3 meter patch cord

(PC-F). The beam receiver can be mounted in a simple optical mount that provides

rotation about 2 axes. The efficiency of coupling laser light into the fiber is

optimized by small angular adjustments of the beam receiver in qand f. The

opposite end of the fiber optic cable connects at the rear panel of the Wavemeterjr

and injects the light into the chassis.

Inside the chassis of the Wavemeterjr is a compact scanning Michelson

interferometer. The incoming laser beam is split into two paths, with one path

length varied by a scan mechanism. The two paths are recombined, producing

interference fringes that are detected by a photodiode. Simultaneously, the

displacement of the scan mechanism is measured by a high resolution Moiré gauge.

The microprocessor computes the correct wavelength or frequency from these two

signals, and transmits this data to the front panel display and RS-232 port. The

units of measurement are selected by a push button on the front panel.

The Moiré gauge attached to the scan mechanism of the Michelson interferometer

must be calibrated against a red HeNe laser. This is accomplished by introducing a

HeNe laser beam into the beam receiver and depressing the CALIBRATION button

on the front panel. The calibration value is stored in non-volatile memory that is

unaffected by power interruption.

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Wavemeterjr Operating Manual 1. Introduction

Burleigh Instruments, Inc. (04659-M-00 Rev E) page 1-2

Burleigh Park, Fishers, NY 14453

Figure 1.1. Wavemeterjr Layout.

Two modes exist for the measurement cycle. In the standard mode, the

measurement is performed and displayed every 200 milliseconds. When the

AVERAGE button is depressed, the data is accumulated for 10 sequential

measurements and the display is updated with the average value every 2 seconds.

The AVERAGE mode is particularly useful for lasers that possess some frequency

jitter.

The Wavemeterjr upper front panel includes a six digit LED display and a bar-

graph intensity meter. The intensity meter indicates the peak to peak intensity of

the interferometer fringe signal, and can be used to facilitate alignment of the beam

receiver with the input laser beam. A “LO SIG” or “HI SIG” message will also be

flashed on the display when a low or high input intensity condition exists.

Three BNC coaxial connectors on the rear panel allow you to diagnose the operation

of the instrument with an oscilloscope. These are labeled MONITOR, WINDOW,

and TRIGGER. Together, they enable the user to observe the fringe signals from

the Michelson interferometer in order to align the beam receiver, optimize the

alignment of the interferometer’s adjustable mirror, and analyze the characteristics

of the laser input.

The auto-resolution feature built into the Wavemeterjr circuitry allows the

instrument to measure the wavelength of lasers with linewidths as great as 3000

GHz, despite the associated low coherence length. The auto-resolution circuitry

automatically adjusts the measurement range to be consistent with the coherence

length, and the result is displayed with relevant precision.

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Wavemeterjr Operating Manual 2. Initial Inspection

Burleigh Instruments, Inc. (04659-M-00 Rev E) page 2-1

Burleigh Park, Fishers, NY 14453

2. INITIAL INSPECTION

2.1 VISUAL INSPECTION

The Wavemeterjr has been packaged in a special carton designed to give maximum

protection during shipment. If the outside of the shipping carton is damaged, notify

your shipping department immediately. The shipping department may wish to

notify the carrier at this point.

If the shipping carton is undamaged externally, the instrument can be removed

from the carton. If any damage is evident visually or if any loose components can be

heard when the instrument is inverted, notify your shipping department and

Burleigh Instruments, Inc. It is advisable to save the special carton for future

storage or transportation.

2.2 OPERATIONAL INSPECTION

The purpose of this section is to provide a brief functional check of the Wavemeterjr.

Please perform the following procedure upon receiving the instrument. Complete

operating instructions and feature descriptions will be found in Section 3 of this

manual.

NOTE: Before plugging in the instrument check that the 115/230 VAC switch on the rear

panel is correctly set for the line voltage. Incorrect setting can cause permanent

damage to the instrument. For 100 VAC operation set the 115/230 VAC switch to

115 VAC and refer to Section 3.13 for the correct internal transformer

connections.

Place the Wavemeterjr on a firm horizontal surface (optical bench or lab table).

Attach the AC line cord. Turn on the power switch and listen for any unusual

noises. When the power switch is turned on or off, you should hear an audible click

caused by the solenoid lock that secures the interferometer scanning assembly

when power is off.

With power on, two of the UNITS lights should illuminate and the numerical

display should light all 8’s and decimal points for one second followed by a count

down beginning at 10. After a few seconds the countdown should be interrupted by

a display that alternates between “LO SIG” and “_ _ _ _ _ _” until a laser input is

introduced. If the countdown continues to zero, turn off the unit, wait 10 seconds,

and try again. Consult the troubleshooting section of this manual if the countdown

to zero operation persists.

To test the UNITS display, press the UNITS button on the lower front panel. Two

lights should illuminate, and the UNITS display should change in sequence —

nm/vac, cm-1/vac, nm/air, cm-1/air - each time you press the button.

Press the AVERAGE button. It should illuminate and remain locked in place until

you press the button again.

Press the CALIBRATE button. The display should read “CAL” for approximately

two seconds followed by the word “FAIL”. This is correct, given that there is no

calibration laser input.

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Wavemeterjr Operating Manual 2. Initial Inspection

Burleigh Instruments, Inc. (04659-M-00 Rev E) page 2-2

Burleigh Park, Fishers, NY 14453

Observe the two DETECTOR indicators on the rear panel. The VIS indicator

illuminates when the detector is configured for visible wavelength (400-1100 nm)

operation. The IR indicator illuminates when the detector is configured for a

wavelength range from 600 to 1800 nm.

Once you have completed all of these checks successfully, refer to Section 3 of this

manual for further operating instructions.

Figure 2.1. WA-2500 Front Panel.

Figure 2.2. WA-2500 Rear Panel.

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Wavemeterjr Operating Manual 3. Operating Instructions

Burleigh Instruments, Inc. (04659-M-00 Rev E) page 3-1

Burleigh Park, Fishers, NY 14453

3. OPERATING INSTRUCTIONS

3.1 INITIAL SET UP

Position the Wavemeterjr on a firm horizontal surface. It is important that this

surface be horizontal and stable to ensure proper operation of the internal

interferometer scanning mechanism. The upper front panel is swivel mounted to

accommodate a wide range of viewing angles. Tilt the upper front panel to a

comfortable viewing angle.

NOTE: Check that the 115/230 VAC on the rear panel is correctly set and attach the AC

line cord. If the initial operational check has not been performed, refer to Section

2.2 of this manual. For 100 VAC operation, refer to Section 3.13.

3.2 BEAM RECEIVER MOUNTING

The optional beam receiver accessory consists of an optical coupling head (BC-1)

attached to a 3 meter FC connector terminated patch cord (PC-F) which provides the

input beam for the instrument.

CAUTION: The fiber optic cable and internal components of the coupling head are made of

glass and must be handled with care. Do not drop, bend sharply, stretch, or

otherwise stress the cable particularly in the vicinity of the connector. Permanent

damage to the cable can result. Do not drop the coupling head.

Optical power incident on the beam receiver should not exceed 100 milliwatts over

the entire operating range of 400 to 1800 nm. For beams smaller than the input

aperture of 2.5 mm, the maximum allowable power must be adjusted downward to

avoid exceeding safe power densities. Optical powers in excess of these limits

may cause irreparable damage to the assembly.

To install the beam receiver, first remove the dust covers from the fiber optic input

on the rear panel of the Wavemeterjr, the BC-1 optical coupling head and both ends

of the FC connector terminated patch cord. Store these dust covers for future use.

Connect the2 fiber optic cable to the FC connector on the rear panel of the

instrument and to the BC-1 optical coupling head. There is a “keyed” position for the

connector. Rotate this into position before tightening the knurled lock ring.

Figure 3.1. Beam Receiver.

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