SE 200 Spectrograph for use with Andor
Contents
1. SE 200 Spectrograph for use with Andor Technology Cameras Catalina Scientific Instruments 1870 West Prince Road 21 Tucson Az 85705 USA Phone 520 571 8000 Fax 520 571 0120 Web www catalinasci com System Overview The SE 200 is an echelle type spectrograph with an echelette grating designed for use with CCD imaging arrays Here is a diagram of the optical layout of the system m ge a PR eee oe a rn a PRIMARY MIRROR ENTRANCE APERTURE ccD GRATING The standard ENTRANCE APERTURE is a square slit 25 microns in size Slits of other sizes are available The PRISM and GRATING are contained in what is called a dispersion module The CCD is contained in a camera head mounted at the exit port The focal length of the SE 200 system is approximately 200mm The resolving power A AA ranges from about 2000 to over 6000 depending on the PRISM and GRATING combination the size of the pixels on the CCD and whether the camera is intensified or non intensified Fine Focus Input Accessory Holder a Input Accessories Dispersion Modules Fine Focus CCD Cameras Shutter Control KestrelSpec Software Optional 4 a Shutter Control Dispersion Module A pen lamp and filters can be used on the standard accessory mount There are two options for using a fiber as input 1 A fiber holder with an X Y stage or 2 An SMA connector The PRISM and GRATING reside in a cylindrical mod2. turn the screw just a small amount and keep acquiring images until the maximum peak intensity is achieved As the alignment improves the peak intensity will increase and it may become saturated or overexposed When this happens decrease the exposure time so the peak is not overexposed When both X Y stage screws are adjusted to their optimum position then loosen the fiber insert it closer to the slit tighten the fiber and repeat the above steps to optimize the adjustment of the two screws Keep adjusting the two X Y screws at each stage until the fiber is inserted all the way into the holder 2
3. There are additional slits available in various sizes such as 10 x 50 microns 25 x 50 microns 50 x 50 microns 75 x 100 microns or any other sizes that may be required Each slit is mounted at the ENTRANCE APERTURE with 4 bolts The slit dimensions are stamped on the mounting plate Mounting plate for the slit can be used with either an attached SMA connector ora separate X Y stage To change slits there are two methods depending upon whether an SMA connector comes with each slit or an X Y stage is being used 1 When using an SMA connector each slit mounting plate comes with the SMA mount already attached and aligned with the slit Do NOT remove the SMA mount from the slit Keep the two pieces together Mounting plate for the slit with an SMA mount already aligned with the slit Keep the SMA and slit mounts together The slit dimensions are stamped on the mounting plate 2 When using an X Y stage remove the Input Accessory Holder and the X Y stage if they are currently mounted on the spectrograph Whether there is an SMA attached to the slit or not the slit mounting plate can be removed by undoing the 4 bolts holding the slit in place All SE 200 slits come in the same sized square mounting plate lt Prism Dispersion G o i z 2 1 m 2 y Slit mounting plate without an SMA mount The direction of the grating dispersion is vertical at the ENTRANCE APERTURE Keep this in mind whe
4. comes with a camera already mounted then the system has been aligned and focused at the factory All that is needed is a check of the alignment and the focus of the images before calibrating If the system does not come with the camera already mounted or the camera is removed for any reason then the camera must be mounted aligned and focused Catalina Scientific can provide the mounting brackets and customized faceplate for CCD cameras that will be used with the SE 200 The grating dispersion direction of the SE 200 is vertical at the exit port The CCD camera should be mounted so the dispersion direction goes from left to right across the CCD Dispersion Module For most cameras the vertical direction of the grating dispersion will require that the camera be mounted sideways on the SE 200 so the dispersion direction goes from left to right across the CCD 14 A customized mounting plate is required to mount an Andor camera onto the SE 200 All mounting plates for the SE 200 have a raised circular area that protrudes less than 1mm The mounting plate should first be secured tightly onto the camera head SE 200 Mounting Plate on the Andor Camera Raised circular disk on the camera mounting plate The raised circular disk on the mounting plate must be properly seated into the circular depression at the exit port of the SE 200 Exit Port on the SE 200 Circular depression that must be seated with the raised circular disk on t
5. optimally adjust the X Y stage by maximizing the intensity of a central peak in the image Acquire an Hg image with a relatively short exposure time and go to Image Display Mode Turn on the image Peak Finder Zoom in on a single central peak with an intensity that is well below the saturation point of the CCD so the peak is not over exposed The example peak in the image below has an intensity of about 15000 which is well below the saturation point of about 45000 for the CCD Image Peak 1 Intensity 15220 335 556 Y 210 011 Leave the image Peak Finder enabled and select Repeat Acquire Image Images will be continuously acquired and the intensity of the single peak will be redisplayed with each acquisition As the images are being acquired and displayed turn one of the two X Y adjustment screws just a small amount either clockwise or counter clockwise Monitor the intensity of the single peak to see if the intensity decreases or increases with each acquisition If the intensity decreases then the adjustment is in the wrong direction so turn the screw in the opposite direction until the the intensity increases If the intensity increases then keep turning the screw in small amounts in the same direction until the intensity starts to decrease The goal is to adjust the X Y screw until the intensity of the peak is at its maximum Once the first X Y screw is adjusted properly then adjust the other screw in the same manner
6. that the open close time be set to 4 msec in the Setup Camera Configuration menu option in KestrelSpec TTL High should be enabled There is a toggle switch on the top of the shutter controller that has two positions labeled TTL and Open In the TTL position the shutter is controlled via a TTL pulse In the Open position the shutter stays open and isn t controlled by the TTL pulse Note If the shutter is to remain open because it isn t necessary to control it via TTL then power on the shutter switch it to OPEN and then power it off It will remain open The shutter has two settings Open and TTL 17 The Andor Classic CCD cameras have been updated to the iKon model An iKon camera is shown below mounted on an SE 200 with a shutter The iKon is mounted upright on the SE 200 which requires that both Auto Image Flip Vertical and Auto Image Flip Horizontal be enabled under the Set menu option of the KestrelSpec program Also the iKon rotates the image 90 clockwise so Rotate 90 Degrees should be enabled under Setup Camera Configuration Binning Andor iKon Camera on the SE 200 Shutter controller box Shutter power cable Camera Power Cable USB Data Cable to Computer BNC cable from the shutter controller box to the Shutter connector on the camera head 18 An iXon camera is shown below mounted on an SE 200 with a shutter The iXon is mounted sideways on the SE 200 with the top
7. 2 Y 534 946 Y 535 922 As another example the following image has two prominent peaks at 435 833nm that should both be lined up in the same pixel row 24 These peaks were aligned in row 854 by zooming in on the lower portion of the image and using the image Peak Finder to determine when the peaks were aligned horizontally rage Pisak af Intengity 3570 108 151 Y 054 166 Both 435 833nm peaks are aligned in row 854 in the image 25 Aligning a Fiber Using the X Y Stage When using an X Y stage instead of an SMA connector the fiber must be aligned with the entrance slit to maximize the amount of light entering the SE 200 There are two X Y stage adjustment screws one on top of the stage and one on the side These screws are used to adjust the X and Y position of the fiber until the end of the fiber is directly aligned with the entrance slit The fiber will have to be re aligned whenever the slit is changed or the fiber is removed and then re inserted To align the fiber it is typically more convenient to remove the holder for the filter and the pen lamp Filter and Pen Lamp Holder Removed Stage Adjustment Fiber Tightening Screw Stage Adjustment gt om Mounting Stage Screws Fiber Holder Note The fiber tightening screw is next to the top stage adjustment screw and it is easy to confuse the two of them Turning the stage adjustment screw by accident when tightening or loosening the fiber c
8. an misalign the fiber with the entrance slit and the fiber will have to be re aligned The standard fiber is 400 microns in diameter but there are custom sized fibers Entrance slits come in different sizes but in general if the center of the entrance slit is more than about 50 or 75 microns from the center of the fiber then the fiber is misaligned The greater the misalignment the more the light will be blocked from passing through the slit which will decrease the intensity of the acquired images To align the fiber with the slit it is recommended that the fiber first be inserted into the fiber holder as far away from the entrance slit as possible The X and Y screws are then adjusted to maximize the intensity of the acquired images Then the fiber is gradually inserted closer to the slit and the X and Y screws again adjusted to maximize the intensity of the acquired image The goal is to have the fiber inserted all the way into the fiber holder and have the X Y stage adjusted so the image intensity is at its maximum Note Whenever images are acquired be sure the fiber is held in place by turning the fiber tightening screw until the fiber is snug but not so tight that the X Y stage could be damaged 26 As the fiber is moved closer and closer to the slit the X and Y screws are adjusted to optimize the alignment of the fiber with the slit This optimization is achieved by maximizing the intensity of the acquired image Follow these steps to
9. e The major peaks of Hg are shown in the two images below The top image is Hg superimposed over deuterium tungsten The bottom image is of Hg only i 365 02nm 365 02nm in order 29 in order 30 579 07nm 579 07nm in order 18 in order 19 253 65nm 253 65nm 253 65nm 253 65nm 546 07nm 579 07nm 546 07nm 579 07nm 576 96nm 576 96nm 11 UV Dispersion Module The major peaks of Hg are shown in the two images below The top image is Hg superimposed over deuterium tungsten The bottom image is of Hg only Note Because of differences in the blaze wavelength for two of the UV gratings the Hg peaks can be in different locations depending upon which grating is in the module If you have a UV module refer to the document that came with your system for the location of the Hg calibration peaks 435 83nm 435 83nm 5 l 576 96nm 579 07nm_ sIn order 24 in order 25 morder 19 in order 18 546 07nm in order 20 435 83nm 365 02nm 435 83nm 365 02nm 404 66nm 404 66nm 576 96nm 579 07nm 546 07nm 576 96nm 12 The other UV module has a grating with a lower blaze wavelength This second grating has Hg peaks in different locations than the images shown on the previous page The image below is of Hg for the UV module that has a grating with a lower blaze wavelength 253 65nm 253 65nm 253 65nm 365 02nm 365 02nm 404 66nm 435 83nm 546 07nm 4 576 96nm 579 07nm 13 Mounting a Camera on the SE 200 If the SE 200
10. er there may be crosstalk between adjacent orders with either the High Order or UV module above 500nm especially when analyzing a continuum spectrum The UV module will have gaps in the data above 500 or 600nm depending upon the size of the CCD To change modules remove the four Allen head screws around the outside of the module with the wrench that has been provided Do NOT touch the center bolt Loosening this center bolt will change the tilt of the PRISM and GRATING and cause serious misalignment of the system Do NOT turn the center bolt Four outside screws _ Flat edge After the four outside screws have been removed gently pull the module out of the SE 200 Always store the module in a dust free cushioned bag Another dispersion module can now be inserted Push the new module all the way in making sure the flat edge is towards the camera and the four outside screws line up with their holes Tighten the four screws to secure the module in place After changing modules be sure to update Model Name and the configuration parameters in the Setup Spectrograph Configuration menu option of the KestrelSpec software Realign the camera and recalibrate according to the instructions in the Using KestrelSpec section of the user manual Here are three images of a deuterium tungsten light source taken with the SE 200 The top image used the Standard dispersion module and shows fairly good separation of the orders especia
11. he camera mounting plate Once the mounting plate on the camera is seated properly in the circular depression at the exit port the mounting brackets at the top and bottom can be tightened to hold the camera in place It is important that the camera mount remained seated with the exit port 15 The Andor CCD ICCD and iStar cameras can all be used with the SE 200 The CCD and ICCD cameras are mounted upright on the SE 200 with the bottom of the camera facing the bottom of the spectrograph The camera is held in place with upper and lower mounting brackets A faceplate supplied by Catalina Scientific is required to mount an Andor camera on the spectrograph Andor cameras typically invert the image data so Auto Image Flip Vertical will most likely need to be enabled under the Set menu option of the KestrelSpec program Also some Andor CCD and ICCD cameras rotate the image 90 clockwise lf the image is rotated then the camera is oriented properly on the SE 200 when it is rightside up If the image isn t rotated then the camera is still mounted right side up but Rotate Image 90 Degrees should be enabled under Setup Camera Configuration Binning in the KestrelSpec application Andor Classic ICCD intensified Camera on the SE 200 Upper mounting bracket Top of the camera Gate Control Manual Mode and Gain settings k ma E i F Lower mounting bracket ba Data Connector for the cable to the PCI con
12. iameter to accommodate two different sizes of lamps The filter holder is a plate with two mounting screws The bottom of the plate has a lip for holding the filter in place The filters can be up to 2 x 2 or 50mm x 50mm in size Filter Tightening Pen Screws Lamp Holder Filter Holder Lip There are 2 options for using an optical fiber as input 1 An X Y Stage When using a stage the filter holder must be removed so the X Y stage holding the fiber can be mounted A fiber is inserted through the center of the X Y stage until it is resting against the ENTRANCE APERTURE A tightening screw is used to hold the fiber in place Keep in mind that one of the X Y adjustment screws is just above the tightening screw It is easy to confuse the two of them The X Y stage is used to center the end of the fiber on the entrance slit See Aligning a Fiber Using the X Y Stage at the end of this manual X Y stage fiber holder Upper adjustment screw for the X Y stage Tightening screw for the fiber Optical fiber F 2 An SMA Connector An SMA connector can be used right at the ENTRANCE APERTURE so the fiber can be attached directly to the connector Using an SMA connector is much simpler than an X Y stage because the SMA comes pre aligned to the entrance aperture SMA Mount and its Connector Fiber attached to the SMA Connector The SE 200 comes with a standard ENTRANCE APERTURE that is a 25 micron square slit
13. justment then the PRIMARY MIRROR needs to be repositioned for the CCD camera Contact Catalina Scientific for instructions on repositioning the PRIMARY MIRROR inside the housing of the spectrograph Fine Focus screw 23 Aligning a Camera on the SE 200 Once the mounting plate is properly seated on the exit port the camera must be aligned It is recommended that the upper and lower backets holding the camera mounting plate to the SE 200 be slightly loosened during alignment The brackets should be tight enough so the camera mounting plate stays seated in the circular depression on the SE 200 But the brackets should be loose enough so the camera can be rotated to achieve the proper alignment Once the camera is aligned the brackets can be tightened again so the camera does not move Before attempting to align the camera select prominent peaks in the image that must be aligned in the same row While in Image Display Mode use the Image Peak Finder to determine when the selected peaks are lined up horizontally in the image To use the Peak Finder first Zoom in on a row of prominent peaks like the peaks of 253 65nm In the example below there are four peaks at 253 65nm that are lined up within one pixel row of each other in rows 535 and 536 Image Peak 1 Image Peak 25 Intensity 36177 Intensity 11264 X 420 005 x 623 075 Y 535 956 Y 536 008 Image Peak 45 Image Peak 67 Intensity 6760 Intensity 4577 X 217 015 X 826 96
14. lly in the UV The second image used the High Order dispersion module and shows how much closer the orders are than in the Standard module The third image used the UV dispersion module which has twice the dispersion as the High Order module The order bands in the SE 200 are not straight across They curve slightly up to the left UV Orders Visible Orders IR Orders Standard Module 3 UV Orders Visible Orders IR Orders High Order Module UV Orders Visible Orders IR Orders UV Module The Standard module requires a CCD that is at least 12mm x 12mm in size The High Order module requires a CCD that is at least 10mm x 10mm in size The UV module requires a CCD that is at least 13mm x 13mm in size If a CCD is smaller than these minimum sizes then some spectral data will be lost and gaps will appear in the spectral curves Standard Dispersion Module The major peaks of Hg are shown in the two images below The top image is Hg superimposed over deuterium tungsten The bottom image is of Hg only 253 65nm 253 65nm in order 26 in order 27 Tien n m DO gt aoa a o Mni memencnamees i a oo az i 546 07nm 546 07nm in order 12 in order 13 404 66nm 404 66nm in order 16 in order 17 579 07nm 579 07nm in order 11 in order 12 253 65nm 404 66nm 404 66nm z JA 576 96nm 579 07nm 546 07nm 576 96nm 579 07nm 546 07nm 10 High Order Dispersion Modul
15. n a rectangular slit is being mounted A rectangular slit such as the 75 x 100 micron slit can be mounted two different ways depending upon whether the height of the spectral orders should be 75 microns or 100 microns tall The dimensions of the rectangular and square slits are stamped on their mounting plates When an optical fiber is used with an X Y stage the stage is used to line up the fiber with the slit The X Y stage and its fiber holder are mounted directly onto the slit Stage l Slit Mounting Plate Fiber Tightening S Stage crew Adjustment X Y Mounting stage Screws for the _ Fiber X Y Stage Holder Once the X Y stage is in place remount the standard Input Accessory Holder and insert the fiber into the fiber holder on the X Y stage This way you can switch between using a pen lamp or a fiber as input to the spectrograph For details on aligning the fiber with the slit using the X Y stage see Aligning a Fiber Using the X Y Stage on the last two pages of this document Allen wrench in upper stage adjustment Y X Y Stage Allen wrench in outer stage adjustment Optical fiber Dispersion Modules There are currently three standard dispersion modules SE 200 Standard SE 200 High Order and SE 200 UV modules All modules cover a wavelength range of about 190nm to 1100nm The High Order and UV modules have higher resolution but their orders are closer together When orders are close togeth
16. of the camera facing the dispersion module The iXon images are oriented properly so the images do not have to be flipped or rotated in the KestrelSpec software The iXon has a Shutter connector on the camera head that is connected to the BNC connector on the Shutter controller Connect the power to the shutter and set the shutter to TTL so the shutter can be software controlled The internal shutter has been removed from the iXon so the camera can reach focus on the SE 200 The external shutter on the SE 200 is controlled in the KestrelSpec software as if it were an internal shutter in the camera head The SE 200 shutter can be set to a Shutter Mode such as Fully AUTO Hold OPEN Hold CLOSED and CLOSED for Dark By default the shutter mode is set to CLOSED for Dark when the software first starts Andor iXon Camera on the SE 200 Shutter controller box Camera Power ohutter Cable power l cable Data Cable to PCI card in the Computer BNC cable from the shutter controller box to the Shutter connector on the camera head 19 The iStar cameras are mounted sideways on the SE 200 with the top of the camera on the same side as the dispersion module The iStar images must be flipped vertically but not rotated 90 So be sure the Set Auto Image Flip Vertical menu option is enabled The iStar camera has a built in digital delay generator The gain exposure time width and delay of the gater are all cont
17. r camera is also mounted sideways on the SE 200 with the top of the camera on the same side as the dispersion module This newer iStar flips the images in both the vertical and horizontal directions so be sure both Set Auto Image Flip Vertical and Set Auto Image Flip Horizontal menu options are enabled The USB iStar camera and SE 200 spectrograph components Upper mounting bracket Dispersion USB Module Data Cable To computer Top of Camera Camera Power Cable 22 Fine Focus Adjustment Once the camera is mounted on the spectrograph the images must be focused The goal of focusing an image is to get the smallest spot size possible for any prominent peak in the image Zoom inona prominent peak in the acquired image then repeatedly acquire images and adjust the fine focus until the smallest spot size for the peak is achieved Above the PRIMARY MIRROR is a focusing screw that is used to adjust the fine focus of the spectral images acquired by the CCD camera Turning the screw clockwise will lower the PRIMARY MIRROR and move the focus farther out from the exit port Turning the screw counter clockwise will raise the PRIMARY MIRROR and bring the focus closer to the exit port An Allen head wrench has been supplied for adjusting the focusing screw See the Using KestrelSpec section of the user manual for detailed instructions on how to get the sharpest focus for the images If the images cannot be focused using the fine focus ad
18. rolled via software See the Digital Delay Generator controls for the Setup Camera Configuration menu option in the KestrelSpec software Andor iStar Camera on the SE 200 Shutter Controller Box Upper mounting bracket Dispersion Module Top of Camera BNC cable from the shutter controller box to the Fire connector on the camera head The SE 200 shutter is optional for the iStar camera because to acquire dark frames the photocathode can be disabled See the Disable photocathode for dark frames check box under Setup Camera Configuration Digital Delay Generator in the KestrelSpec software The SE 200 mechanical shutter takes up to 3 or 4 milliseconds to open close If the exposure time for the dark frame is extremely short then the shutter may not be necessary If so flip the switch on the shutter box to Open and then power off the shutter control box The shutter will remain open without the power 20 The SE 200 mounting plate requires four 6 32 socket head cap screws to attach the plate to the front of the iStar 6 32 6 32 Screw Screw 6 32 6 32 Screw Screw Andor supplies a 7 64 wrench with each iStar so it can be used to attach the mounting plate 7 64 Wrench from Andor Screw 6 32 Screw SE 200 Mounting Plate The 7 64 wrench is inserted into sleeves on either side of the iStar camera head to fasten the 6 32 screws as shown in the above illustration 21 The USB iSta
19. troller card This Andor Classic ICCD has manual Gain and Mode settings on top of the camera The Mode should be set to 1 and the Gate Input should be connected to the Fire connector on the Multi I O Box when used with the KestrelSpec application 16 Andor Classic CCD non intensified Camera on the SE 200 shutter controller BNC cable for TTL control of shutter the shutter area Data Cable Data Connector PCI Controller Data Card Connector Auxiliary Connector Shutter to I O Box power supply Multi I O box sends TTL pulse on the Shutter connector This camera does not have a shutter so a TTL controlled shutter on the SE 200 is used with the Multi I O box connected to the auxiliary port on the controller card The shutter is located just inside the ENTRANCE APERTURE and it is wired to the controller above the camera head The shutter has a 5 volt DC power supply and a BNC connector to receive TTL signals To activate the shutter a high TTL pulse is sent from the PCI controller card by way of the Shutter connector on the Multi I O box to the BNC connector on the SE 200 shutter controller The length of the TTL pulse is equal to the exposure time The shutter is capable of a minimum exposure time of about 003 second however most Andor cameras can only handle shutter soeeds down to 5 milliseconds The rise time of the shutter is about 001 second and the closing time is 0 002 second It is recommended
20. ule that can be changed by the user to provide different dispersion characteristics The position of the PRIMARY MIRROR can be adjusted to focus the images on the CCD detector The camera head is mounted at the exit port For cameras without shuttering capability a shutter assembly can be added behind the ENTRANCE APERTURE on the inside of the spectrograph The shutter control box is mounted above the camera head For cameras without shuttering capability a shutter assembly can be added behind the ENTRANCE APERTURE on the inside of the spectrograph The shutter control box mounted above the camera head has a BNC connector for TTL signals that control the opening and closing of the shutter Every SE 200 system comes with KestrelSpec software to acquire images from the camera focus and align the images and calibrate and analyze the spectral data The first three sections of the KestrelSpec user manual explain how to use the software Start with the tutorial in Learning KestrelSpec Go on to Using KestrelSpec so the system can be configured focused aligned and calibrated Use the Reference section to learn about additional features for analyzing data identifying elements and displaying and saving data Input Accessories The SE 200 comes with a standard accessory holder for a pen lamp and a filter The pen lamp holder is mounted horizontally and a lamp can be inserted from either side One side is 10mm and the other side is 11mm in d
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