MOGlabs MWM User manual

MWM wavemeter
Revision3.19 mogwave 1.4.15 Firmware0.6.9

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Preface
The MOGLabs MWM wavemeter provides a compact, high resolution and
costeffective instrumentformeasuring thewavelengthand spectrumofa
laser. The instrument can be operated standalone, and easily controlled
fromacomputerwithasophisticatedhostapplicationorusingsimpletext
commands,viaUSB andethernet. Thelowpricemakesisaffordableeven
ifyouhavejustonelasertomeasure.
WehopethatyoufindtheMWMuseful,andpleaseletusknowifyouhave
anysuggestionsforimprovementoftheMWM orthisdocument,sothatwe
canmakelifeinthelabbetterforall.
MOGLabs,Melbourne,Australia
www.moglabs.com
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Contents
Preface i
1 Introduction 1
1.1 Basicsetup............................ 1
1.2 Softwareinstallation . . . . . . . . . . . . . . . . . . . . . . . 3
2 Standalone operation 5
2.1 On-devicemeasurements . . . . . . . . . . . . . . . . . . . . 5
2.2 Frontpaneldisplayandbuttons . . . . . . . . . . . . . . . . 5
2.3 Measuring............................. 6
2.4 Devicemenus........................... 7
3 Web interface 11
3.1 Homepage ............................ 12
3.2 Liveview.............................. 13
3.3 Live+................................ 14
3.4 Devicesetup............................ 14
3.5 Software.............................. 16
3.6 Updatefirmware......................... 16
4 MOGWAVE 17
4.1 Devicediscovery......................... 17
4.2 Maindisplay........................... 18
4.3 Menu................................ 20
4.4 Acquisition............................. 25
4.5 Options............................... 25
4.6 Wavelength............................ 26
4.7 Functions ............................. 27
4.8 Statusbar............................. 29
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iv Contents
5 Signal out and PID 31
5.1 MOGLabsDLC lasercontroller . . . . . . . . . . . . . . . . . 32
5.2 PIDparameters.......................... 32
5.3 Integratorwindup......................... 33
5.4 Examples.............................. 34
6 Calibration 37
6.1 Existingwavelengthrange . . . . . . . . . . . . . . . . . . . 37
6.2 CalibratingwithMOGLabsFZWwavemeter . . . . . . . . . 40
6.3 CalibratingwithHighFinessewavemeter . . . . . . . . . . . 40
6.4 Newwavelengthrange. . . . . . . . . . . . . . . . . . . . . . 41
6.5 Newfibre............................. 44
A Specifications 47
B Communications 51
B.1 TCP/IP............................... 51
B.2 USB................................ 54
C Programming 59
C.1 python example.......................... 59
D Command language 63
D.1 Wavelengthmeasurement . . . . . . . . . . . . . . . . . . . . 63
D.2PIDcontrol............................ 64
D.3Generalfunctions......................... 65
D.4Displayfunctions......................... 66
D.5 Auxilliarymeasurements. . . . . . . . . . . . . . . . . . . . . 66
D.6Imaging............................... 68
D.7 Configurationsettings . . . . . . . . . . . . . . . . . . . . . . 70
D.8EEPROMaccess......................... 73
Emogwave configuration 75
E.1 Command-lineoptions . . . . . . . . . . . . . . . . . . . . . . 75
E.2 Configurationfile......................... 77
Fmogwave server 79
F.1 Enablingtheserver. . . . . . . . . . . . . . . . . . . . . . . . 79
F.2 Communicationwiththeserver . . . . . . . . . . . . . . . . . 79
F.3 mogwave commands........................ 80

Contents v
G Ugrading firmware 83
References 84

vi Contents

1. Introduction
TheMOGLabsMWMopticalinstrumentisahighresolutiondiffractiongrat-
ingspectrometerinLittrowconfiguration. Opticalinterferencecreatesan
imageofasinglemodefibrecoreatawavelength-dependentpositionona
semiconductorimagingsensor. Theimageisdigitisedathighspatialreso-
lutionandwithhighdynamicrangeandspeed. Thewavelengthspectrumis
determinedfromthedigitisedimageandafittingproceduredeterminesthe
peakwavelength. Itprovidespicometre(0.001nm)accuracyandpicowatt
sensitivity, with up to 1250 readings per second. The relative accuracy,
forexampleinmeasuringthedifferencebetweentwolaserwavelengths,is
around10MHz(0.01pm).
The device can be operated standalone (without a host computer, see
fig.1.1)orviaawebbrowser(fig.1.2)orusingthemogwave GUIapplication
(chapter 4). Integration with data acquisition systems is straightforward
usingUSBorethernet(TCP/IP)communicationsandsimpletext-basedcom-
mands.
Figure 1.1: Wavemeteron-devicedisplay,showingserialnumber,firmwarever-
sion,wavelengthrange,temperature,pressure,exposuredurationandIPaddress.
1.1 Basic setup
1. Connect a 5V 500mA power supply via the USB interface. Some
computer USB ports will provide sufficient power but in general a
dedicatedpowersupplyorUSB hubisrecommended.
2. Second and third generation (Rev 2 and later) instruments have
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2Chapter 1. Introduction
Figure 1.2: Webinterfacehomepage.
poweron/offviatheOKpushbutton. Topoweronoroff,holdtheOK
buttondownfor2to3seconds.
3. If possible, use a network connection for improved response times
andfasterdata acquisition. Connecttoan ethernet switchandthe
MWM willattempttodetermineanIP addressviaDHCP.Ifthatfails,
it will default to an internal IP which will be shown on the instru-
ment display. See chapter B for more information on configuring
communicationsparameters.
4. TheMWMmustbecoupledtothelightsourceviaasingle-modeopti-
calfibre. Multimodefibreisnot suitable. Theinstrumentsensitivity
isveryhighandsothefibremodediameterneednotbewellmatched;
forexample,a480nmfibrecanbeusedtomeasure780nmlightand
vice versa, though best accuracy and stability are achieved if the
fibre is matched to the wavelength. Fibres with FC/PC (preferred)
or FC/APC connectors can be used, and standard or polarisation-
maintainingfibre.
Note: Yourdevicehasbeenconfiguredandcalibratedusingafibre
witheitherFC/PC orFC/APC connector, usuallywithFC/PCatthe
wavemeter. Pleaserefertothetestdataprovidedwithyourdevice.
If you use a different connector type, you will need to reconfigure
andrecalibrate. Pleaseseesection4.8.
Caution: Thefibretipisanintegralpartoftheinstrument. Unclean