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MCS260B 

CORNERSTONE 260B MONOCHROMATORS 

36 

 

 

 

11  GRATING INSTALLATION AND CALIBRATION 

Grating installation and calibration is 

typically performed at one of Newport’s manufacturing locations, or 

by qualified field service personnel.  The instructions provided in this section are for advanced users only. 
 

11.1  RECALIBRATION SERVICES 

 

Newport suggests that monochromators be returned annually for service.  In addition to verifying 
the calibration, the instrument would be fully inspected.  Any refurbishment required, such as fresh 
lubrication on the worm gear, would be included in the servicing of the instrument. 

 

11.2  SETTING THE WAVELENGTH OFFSET 

 

A wavelength offset is available to shift the wavelength position to either a higher or a lower 
wavelength.  For example, if a HeNe laser operating at 632.8 nm is sent through the 
monochromator and the output is visible when the monochromator is set to 640 nm, a 
compensating offset can be introduced. 

When performing this procedure, it is necessary to use a light source with a known spectral line 
appearing within the operating range of the grating.  Newport offers a number of pencil calibration 
lamps for this purpose, such as the model 6035 Hg lamp.  Another line source such as a laser may 
also be used.  Always be sure to follow the appropriate safety precautions when dealing with any 
light source. 

 

Procedure: 

 

1.  Select a radiation source that has at least one narrow spectral line in the wavelength region of 

interest. 

2.  Select a detector with an operating range appropriate for the spectral line. 

3.  Focus the radiation onto the entrance slit (the monochromator is F/3.9).  Note that a narrower 

slit provides greater resolution. 

4. 

Ensure the focused beam is parallel to the monochromator’s optical axis. 

5.  Command the monochromator to select the grating for which the offset is to be applied to. 

6.  Use  the  STEP  command  to  move  the  grating  position  until  the  spectral  line  is  visible  at  the 

output.   

7.  Use  the  CALIBRATE  command  to  enter  the  exact  wavelength  of  the  spectral  line.    The 

Cornerstone wavelength offset has now been stored in memory.  This offset applies to all other 
wavelength positions when using this grating. 

8.  Repeat  the  process  for  the  other  gratings,  if  required.    Depending  on  the  configuration,  the 

monochromator may have up to four gratings installed. 

 

 

 
 

 

 

 

 

Содержание Cornerstone 260B

Страница 1: ...Family of Brands ILX Lightwave New Focus Ophir Corion Richardson Gratings Spectra Physics MCS260B Rev C 1 4m Monochromator Family User s Manual Cornerstone 260B...

Страница 2: ...RATING TYPES 22 6 2 GRATING EFFICIENCY AND BLAZING 23 6 3 POLARIZATION EFFECTS 26 6 4 OPTIONAL DIFFRACTION GRATINGS 26 7 MONOCHROMATOR RESOLUTION 28 7 1 DETERMINING RESOLUTION 28 8 GETTING LIGHT INTO...

Страница 3: ...1 ACTIVATING THE HAND CONTROLLER 65 16 2 USING THE KEYPAD 65 16 3 KEY REFERENCE 66 17 APPENDIX III USB Operation 69 18 APPENDIX IV GRATING PHYSICS TUTORIAL 70 18 1 THE GRATING EQUATION 70 18 2 THE GR...

Страница 4: ...2 Models 24 Figure 19 Grating Efficiency Curve Cornerstone 260B Monochromator VIS NIR Extended Range Configuration CS260B 3 Models 25 Figure 20 Grating Efficiency Curve Cornerstone 260B Monochromator...

Страница 5: ...se refer to the complete User s Manual and all other documentation provided for additional important notes and cautionary statements regarding the use and operation of the system Do not attempt to ope...

Страница 6: ...as complying with all applicable European Union CE regulations and recommendations WEEE This symbol on the product or on its packaging indicates that this product must not be disposed of with regular...

Страница 7: ...manual Do not remove the cover for normal usage 1 3 ELECTRICAL HAZARDS Make all connections to or from the instrument with the power off The Cornerstone 260B requires DC voltage for operation which is...

Страница 8: ...se If the gratings do require cleaning do not attempt to clean any optical surface except by blowing off dust or lint particles with a stream of dry clean air or nitrogen Wiping the grating surface wi...

Страница 9: ...racy and repeatability and micrometer adjustable slits may be used for maximum flexibility Automatic bandpass control is available with the use of motorized slits 2 1 OPTICAL CONFIGURATION The optical...

Страница 10: ...the Cornerstone 260B with Dual Grating Assembly 2 2 STRAY LIGHT REJECTION Stray light may have a variety of origins Its presence may be caused by a wide variety of design and manufacturing factors Th...

Страница 11: ...to compare values that were measured under identical circumstances The spectral distribution of the source and the response of the detection system are often the dominant factors when determining a s...

Страница 12: ...cally limitless Here we present one example A quantum efficiency measurement system using an optically chopped light source used with a lock in digital amplifier to extract small signal levels from ba...

Страница 13: ...g shipment Inspect the shipping box for external signs of damage or mishandling Inspect the contents for damage If any item is missing or damaged immediately contact the Newport representative from wh...

Страница 14: ...nochromator to an arc lamp or quartz tungsten halogen light source Fig 5 This kit is compatible with Oriel s Research Lamp Housings which hold 50 to 250 watt lamps It includes a base plate a flexible...

Страница 15: ...ns or concerns contact Oriel Instruments or the regional sales representative for Newport ELECTRICAL SHOCK Never attempt to open the lamp power supply or monochromator power adapter These items do not...

Страница 16: ...ently included with Windows operating systems Follow the instructions provided in the Quick Start Guide to install the utility software onto a computer When powering on the instrument for the first ti...

Страница 17: ...f a detection system it is good practice to close the shutter temporarily while changing gratings It is especially important to prevent saturation and possible damage when using a photomultiplier tube...

Страница 18: ...r motorized slits and provide excellent repeatability They are a good choice when only a few slit sizes are required Fixed slits are sold separately to allow customized choices based on the needs of t...

Страница 19: ...e micrometer A set of numbers go around the turning dial Another set of numbers are located on the shaft When the zeroes in both these locations line up the slit is fully closed Fig 11 Turning the dia...

Страница 20: ...lit height is continuously adjustable Pull the lever out for the shortest height Fig 12 Push the slide in for the tallest height setting Fig 13 Figure 12 Shortest Micrometer Adjustable Slit Height Fig...

Страница 21: ...l Instruments and Richardson Gratings are part of the Newport family of brands and have a long history of working together to design monochromators that are appropriate for a wide variety of applicati...

Страница 22: ...or ghosts Holographic gratings do not suffer from ghosts so interpretation of line spectra is simplified The signal to noise ratio SNR is the ratio of diffracted energy to unwanted light energy Althou...

Страница 23: ...ing depends on the specific application Often the desired instrumental efficiency is linear that is the intensity of light transformed into signal at the image plane must be constant across the spectr...

Страница 24: ...gure 17 Grating Efficiency Curve Cornerstone 260B Monochromator UV NIR High Resolution Quad Configuration CS260B 1 Models Figure 18 Grating Efficiency Curve Cornerstone 260B Monochromator UV NIR High...

Страница 25: ...RS 25 Figure 19 Grating Efficiency Curve Cornerstone 260B Monochromator VIS NIR Extended Range Configuration CS260B 3 Models Figure 20 Grating Efficiency Curve Cornerstone 260B Monochromator UV SWIR E...

Страница 26: ...epresentative of 45 degree polarization which is the average of the P polarization and S polarization efficiency curves Typically the efficiency curve for P polarized light peaks slightly lower than t...

Страница 27: ...00 nm 85 74070B Ruled 400 1200 675 to 2500 nm 92 74071B Ruled 400 1600 925 to 2600 nm 82 74072B Ruled 300 500 300 to 1000 nm 80 74073B Ruled 300 1000 625 to 2000 nm 72 74074B Ruled 300 2000 1100 to 24...

Страница 28: ...the throughput always use the widest slits you can while maintaining other system requirements If the source image on the input slit is large and uniform then doubling the width of both slits gives a...

Страница 29: ...en described by an F The position and dimensions of the internal optics determines the pyramid The optical equivalent is a grating image located behind the slit as shown below Fig 23 Only light that p...

Страница 30: ...ng in Stray Light Figure 26 F Number Matcher Used with Fiber Optic Cable Filling the acceptance cone means focusing the beam on the slit at the correct F number Focusing at F3 9 results in an overfill...

Страница 31: ...r sorting or blocking filters are needed 9 1 ORDER SORTING FILTERS For meaningful spectral measurements care should be taken to remove unwanted orders of radiation particularly if the input radiation...

Страница 32: ...s are mounted external to the monochromator Thus the refractive index and thickness of the filters do not significantly affect the focal distance to the collimating mirror inside the monochromator Wit...

Страница 33: ...ded at no extra cost with all Cornerstone models to control both the monochromator and filter wheel accessory The utility software provided with the monochromator includes USB drivers for Windows 7 or...

Страница 34: ...oller commands are listed in Appendix X of this user s manual Figure 29 Cornerstone 260B Monochromator with 74009 Hand Controller 10 3 TRACQ BASIC SOFTWARE Oriel s optional TracQ Basic Data Acquisitio...

Страница 35: ...e command to close the shutter is SHUTTER C A full list of commands is available in Appendix I of this user s manual 10 5 MONO TERM SOFTWARE The Oriel MonoTERM utility is also provided for sending low...

Страница 36: ...hin the operating range of the grating Newport offers a number of pencil calibration lamps for this purpose such as the model 6035 Hg lamp Another line source such as a laser may also be used Always b...

Страница 37: ...d to move the grating position until the first spectral line is visible at the output 7 Note the wavelength at which this first spectral line peak appears 8 Use the STEP command to move the grating po...

Страница 38: ...calibration parameters which are stored in a file on the memory stick shipped with the instrument If these parameters were corrupted from possibly performing an incorrect field calibration they will n...

Страница 39: ...dels USFW 100 74010 Apex2 filter wheel Utility Software Requirements Windows 7 or 10 32 bit or 64 bit operating system TracQ Basic Software Compatible Yes 74009 Hand Controller Compatible Yes Power Re...

Страница 40: ...Output Mics Blaze Wavelength nm 250 500 750 1000 500 750 400 1000 400 650 1000 1850 Line Density 1200 L mm 1200 L mm 600 L mm 600 L mm Number of Ports 3 2 3 3 Wavelength Range nm 250 1300 250 1200 25...

Страница 41: ...MCS260B CORNERSTONE 260B MONOCHROMATORS 41 14 DIMENSIONS Figure 33 Cornerstone 260B Dimensions Figure 34 Micrometer Adjustable Slit Dimensions...

Страница 42: ...MCS260B CORNERSTONE 260B MONOCHROMATORS 42 Figure 35 Model 74104B Mounting Kit...

Страница 43: ...to the following settings Table 1 Baud Rate 9600 Data Bits 8 Parity None Stop Bits 1 Flow Control None Table 1 COM port settings The CS260B requires all Statements to be terminated by a carriage retu...

Страница 44: ...receives on its pin 3 device Rx and transmits on its pin 2 device Tx The PC transmits to the CS260B s Receive pin and receives from the CS260B s Transmit pin The CS260B implements two RS 232 communic...

Страница 45: ...separated from the command by at least one space Numeric parameters can be strings representing either integers or floating point numbers Some commands accept alphabetic strings Some commands accept m...

Страница 46: ...ndshake mode Handshake mode does not apply to USB In Handshake mode Statements received on the RS 232 port are handled as follows Commands If Echo is enabled the CS260B echoes every character it recei...

Страница 47: ...be read back by itself Example USB Send WAVE cr lf Response 500 01 cr lf Discussion In general Handshake and Echo are most useful when troubleshooting an RS 232 connection Otherwise they require an ap...

Страница 48: ...OUTPORT SHIFT PORT SHUTTER O C OVL SHUTTER SHUTTER SLIT s MICRONS value OVL SLIT s MICRONS SLIT 1 SHIFT SLIT 2 SLIT 3 STB SLOWSTEP value OVL STEP value OVL STEP UP DOWN SHIFT STEP UP DOWN STEP STEPSI...

Страница 49: ...Commands Command BANDPASS Purpose Set the desired range of wavelengths at the output The CS260B will automatically adjust the motorized input and output slits if included as the wavelength setting is...

Страница 50: ...alibration so that the current grating location corresponds to 587 1 nanometers Command ECHO Purpose Tell the CS260B to send back every character it receives on the RS 232 port Parameter 1 to turn on...

Страница 51: ...the wheel to it Command FILTER SET Purpose Query the current filter wheel position setting Example Filter set E g response 4 indicates filter 4 is the current selection Command FILTER1LABEL Purpose S...

Страница 52: ...number representing the desired wavelength in the currently selected wavelength units Example gowave 877 679 rotates the grating to the 877 679nm location assuming units are nm Example gowave 546 rot...

Страница 53: ...ample grat E g response 1 the currently selected grating is number 1 Command GRAT1FACTOR Purpose Set the calibration multiplier for grating 1 Parameter A floating point number Example Grat1factor 1 1...

Страница 54: ...ng point number Example grat1offset 2 1 set the cal offset for grating 1 to 2 1 Default 0 0 Command GRAT1OFFSET Purpose Query grating 1 s line calibration offset setting Example grat1offset E g respon...

Страница 55: ...Purpose Query for basic instrument information The response is Oriel Instruments Model 74000 Cornerstone 260 SNXXX V VV where XXX is the unit s serial number and V VV is the version number for the int...

Страница 56: ...port when the flip mirror is extended Parameter 1 or A for the axial port 2 or L for the lateral port Example outport 2 select the lateral port Example outport A select the axial port Default 1 axial...

Страница 57: ...he desired slit width in microns The acceptable range is from 0 to 2000 Values below 6 go to 6 Example slit2microns 10 set the width of slit2 to 10 microns Example slit1microns 200 set slit1 s width t...

Страница 58: ...stage 10000 steps clockwise Example step 500 quickly step the stage 500 steps counterclockwise Command STEPSIZE Purpose Set the number of steps to take when a step or slowstep command is received wit...

Страница 59: ...e version Example version E g response 2 01 version is 2 01 Command WAVE Purpose Query the wavelength corresponding to the actual position of the grating rotation stage This may be slightly different...

Страница 60: ...ix entitled Command Synchronization Example OPC Command OPC Purpose The CS260B will respond with the value 1 when all operations are complete See the section in this Appendix entitled Command Synchron...

Страница 61: ...ete and then it returns the value 1 An application can send this query and wait until it receives a response then it will know that all pending operations are complete For example Send wavelength comm...

Страница 62: ...of the Error Code and then resets the value to 0 Error code Cause 0 No error 1 Command not understood 2 Bad parameter used in command 3 Destination position for wavelength motion not allowed 6 Access...

Страница 63: ...Parameter string not understood E g units belly 185 Label Too Long Filter and Grating labels can t be longer than 8 chars 186 Cmd Queue Overflow Too many commands have been queued 187 Cmd Too Long Com...

Страница 64: ...grade 505 Slit Controller Missing Slit command received but motorized slit not connected 506 Slit Controller Fault A problem was detected with a motorized slit 507 Slit Controller Halted Caused by sli...

Страница 65: ...tant If it is connected when the Cornerstone 260B powers up some information is displayed briefly such as serial number and firmware version of the Cornerstone 260B 16 2 USING THE KEYPAD Some keys are...

Страница 66: ...e and press ENTER STEP UP Press this key once to move the Cornerstone to higher wavelengths by the smallest possible increment Holding this key causes rapid single stepping toward higher wavelengths T...

Страница 67: ...e the calibration SHUTTER Open or close the shutter by pressing this button The shutter position is shown in the display as OPN for open and CLS for closed SHIFT PORT Use this button to select the out...

Страница 68: ...MCS260B CORNERSTONE 260B MONOCHROMATORS 68 seconds of starting a command entry the entry times out and terminates...

Страница 69: ...abView users don t need to install anything else to be able to communicate with the Cornerstone 260B The MonoTerm software is written in LabView and the source code is shipped with the instrument It c...

Страница 70: ...ent grooves at angle I to the grating normal are shown Consider light at angle D to the grating normal this light originates from the A and B rays as they strike the grating The path difference betwee...

Страница 71: ...he output direction Only wavelengths that satisfy the grating equation pass through the exit slit The remainder of the light is scattered and absorbed inside the monochromator As the grating is rotate...

Страница 72: ...order are zero and the light is simply being reflected If the grating angle is positive then the order is positive m 1 if the grating angle is negative then the order is negative m 1 The half angle of...

Страница 73: ...Illuminated width of the grating Normally the smallest slit available and optical aberrations rather than the grating determine the attainable resolution As an example a monochromator in this case Or...

Страница 74: ...dwide Every year the Newport Resource catalog is hailed as the premier sourcebook for those in need of advanced technology products and services It is available by mail request or through Newport s we...

Страница 75: ...ization RMA number must be obtained prior to shipment to Newport This RMA number must appear on both the shipping container and the package documents Return the product to Newport freight prepaid clea...

Страница 76: ...ransit or obligated to accept Products returned for warranty repair without an RMA number The buyer bears all risk of loss or damage to the Products until delivery at Newport s facility Newport shall...

Страница 77: ...ustomer shall not challenge or cause any third party to challenge the rights of Newport Preservation of Secrecy and Confidentiality and Restrictions to Access Customer shall protect the Newport Progra...

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