Teledyne IsoPlane SCT-320 User manual

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Instructions for
Adding or Interchanging Turrets and Gratings in the IsoPlane SCT-320
If it becomes necessary to add or interchange turrets and gratings in the SCT-320 IsoPlane, the following procedure is
recommended. This procedure should be done only by personnel familiar with handling delicate optical components
and familiar with the alignment of optical instruments. The following equipment is required:
PC running Windows
Monochromator Control Software and Manual
Alignment Posts
Helium Neon Laser
CCD camera controlled by WinSpec or Lightfield
Low Pressure Mercury Lamp (IntelliCal Light Source recommended)
NOTES:
MAKE SURE THAT MONO CONTROL SOFTWARE IS RUNNING BEFORE STARTING LIGHTFIELD
OR WINSPEC. THIS IS IMPORTANT BECAUSE MONO CONTROL SOFTWARE MUST HAVE
CONTROL OF THE SCT-320 FOR THIS ALIGNMENT PROCEDURE.
THE CCD SHOULD ALREADY BE MOUNTED, ALIGNED AND FOCUSED TO THE SCT-320 USING
THE ORIGINAL GRATING TURRET PROVIDED, BEFORE PERFORMING THIS INSTALLATION
PROCEDURE. FOR THIS PROCEDURE THE CCD IS CONTROLLED BY LIGHTFIELD OR WINSPEC.
PRIOR TO INSTALLING A NEW TURRET OR GRATING, SET THE SHUTTER CONTROL WITHIN
LIGHTFIELD OR WINSPEC TO DISABLED OPEN. THIS IS NECESSARY TO ALLOW LASER LIGHT
TO ENTER THE SCT-320 CHAMBER FOR OPTICAL ALIGNMENT.
Setting the IsoPlane SCT-320 to Recognize the New Grating
Refer to the Monochromator Control Software Manual Section II for directions on how to install the
Monochromator Control Software.
Refer to the Monochromator Control Software Manual Section III for directions on how to operate the
monochromator using the Monochromator Control Software
1) From the Monochromator Control Software Main Window, select the Install Gratings Button.
2) If you are replacing a grating on the turret, you must first remove the existing grating by selecting the grating to
be removed in the gratings list, and then selecting the Uninstall Button.
3) To install a grating, select the grating position, then enter the Groove Density (g/mm) and Blaze in the appropriate
boxes and select install.
4) The software will respond that you need to calibrate the grating, respond OK.
5) This concludes the initial software installation or the grating.

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Turret Installation and Alignment
1) Install turret refer to section 2.7 of the Isoplane SCT-320 manual
2) Reinitialize the instrument and verify that when the magnets go by the magnet switch it recognizes by
slowing down the index motor driver. (2 magnets represent turret #2, 3 magnets turret#3)
3) The SCT-320 incorporates a detent system to precisely index gratings into operating position. As shown in
the photograph below, the detent consists of a spring mechanism with ball bearing and a V-groove at each
grating position. As gratings are indexed into position, the ball bearing falls into the V-groove to insure
position accuracy.
SCT-320 Detent System
4) After initialization, the detent ball bearing should be centered in the middle of the V-groove. To test this,
move the grating index stepping motor (manually, by hand) +/-1/8th of a turn. The upper brass gear should not
turn. If the upper brass gear moves, then the index mechanism requires adjustment. This is accomplished by
adjusting the number of steps in Mono Control Software until the correct position is reached. Change the
number of steps by 10 steps at a time using the following procedure.
MonoControl Screens
a) Select Setup Mono button
V-Groove
Spring Mechanism
Ball Bearing

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b) Select Goto Configure Motors
c) Select Main Board 3 –OnAxis
d) Change values on Pos6 for turret#1
Pos7 for turret#2
Pos8 for turret#3

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ENTER A VALUE in the appropriated box, press the SET button immediately right of the value and then
press the RESET MONO button after each adjustment. Repeat the test as outlined in Step 4 to determine the
detent position. Note that this procedure might required multiple iterations before the detent is properly
adjusted.
Grating Installation and Alignment
1) With the Monochromator on a clean solid bench with sufficient space, place the helium neon laser at the entrance
slit.
2) Remove the screws from the cover on the SCT-320 grating access port, and remove the cover.
CAUTION: THE OPTICS ARE NOW EXPOSED, DO NOT TOUCH, TALK, OR BREATHE ON THE
OPTICAL SURFACES. PERMANENT DAMAGE WILL BE CAUSED TO THE OPTICAL SURFACES
BY MECHANICAL CONTACT WITH ANYTHING.
3) From the Monochromator Control Software, select the OPERATIONS Button.
4) From the Operations Window, select the grating you want to install, and verify that the correct turret is selected.
Most systems only have one turret, so turret 1 should be selected. If you have multiple turrets, make sure the
correct turret is selected.
5) Enter 0.0 in the wavelength box and click the GOTO Button.
6) Refer to Figures 1 and 2, and carefully place the alignment posts in positions 1 and 2.
Figure 1: Alignment Post, Position 1, near the entrance slit

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Figure 2: Alignment Post, Position 2, near collimating mirror
7) Align the helium neon laser so that the beam passes through the center of the entrance slits, and the pinholes of
both alignment posts (Pos 1 and 2). This insures that the laser is properly aligned to the SCT-320.
CAUTION: DO NOT MOVE THE SCT-320 OR LASER IN RELATION TO EACH OTHER FROM
THIS POINT, OR THE ALIGNMENT WILL NOT BE CORRECT.
8) Remove the two alignment posts from positions 1 and 2.
9) Insert one alignment post into Position 3. Refer to Figure3.
Figure 3: Location of Alignment Post in Position 3
10) Refer to Figure 4 and become familiar with the location of grating adjustment screws. There are three screws;
grating rotation, tilt and tangent.

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Figure 4: Location of Grating Adjustment Screws
11) Turn the grating TILT adjusting screw until the laser beam is approximately centered in height on the pinhole of
Alignment Post 3
CAUTION: DO NOT APPLY EXCESS FORCE TO ANY OF THE ADJUSTING SCREWS.
12) Turn the adjusting screw for grating rotation until the laser beam passes through the center of the pinhole in
Alignment Post 3.
NOTE THAT YOU MAY NEED TO READJUST GRATING TILT AND ROTATION TO PRECISELY
CENTER THE LASER BEAM ON THE PINHOLE.
13) Scan the instrument to 632.8nm for the grating being adjusted. Adjust the TANGENT SCREW until the diffracted
laser beam matches the height of the pinhole in the alignment post.
NOTE THAT THE TANGENT SCREW ONLY ADJUSTS THE HEIGHT OF THE LASER BEAM AT
HIGH WAVELENGTHS. GRATING TILT AND ROTATION SHOULD ONLY BE ADJUSTED AT
ZERO ORDER.
NOTE: WHEN INSTALLING COARSE GRATINGS, FOR EXAMPLE 75G/MM, SCAN TO THE
HIGHEST DIFFRACTION ORDER THAT YOU CAN SEE, SUCH AS 6TH OR 8TH ORDER.
14) Repeat the above adjustments in steps 11-13 until the laser beam passes through the Alignment Post Pinhole at
zero order and the height of the image at high wavelengths matches the height of the pinhole.
15) Remove the Alignment Post from position 3. At this point all adjustment post should have been removed from the
SCT-320. Save the alignment posts for possible future use.
Rotation Adjustment Screw
(Zero Order only)
Tilt Adjustment Screw
(Zero Order only)
Tangent Adjustment Screw
(High Wavelengths Only)

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NOTE: WAVELENGTH POSITION ACCURACY AT HIGH WAVELENGTHS (632.8NM) IS
ACHIEVED WHEN CALIBRATING THE SYSTEM USING THE GADJUST FUNCTION IN MONO
CONTROL SOFTWARE. THIS WILL REQUIRE USE OF A CCD DETECTOR.
Calibrating the SCT-320 using Software
This procedure requires the use of a CCD detector, Lighfield or WinSpec software, and a mercury lamp
installed on the entrance slit of the SCT-320. The CCD should be running for this procedure.
16) Make sure that MONO CONTROL SOFTWARE is running before starting Lightfield or WinSpec. This is
important because MONO CONTROL SOFTWARE must have control of the SCT-320 for this alignment
procedure. Lightfield or WinSpec will be controlling the CCD.
17) Set the entrance slit width to 10 microns
18) Set CCD region of interest to the center row (1 pixel binning)
19) Scan the SCT-320 to 0.0nm using MONO CONTROL SOFTWARE
20) Run the CCD in continuous or focus mode
21) Verify that the zero order (0.0nm) line is located at the center of the CCD (for example, pixel 670 for a Pixis
CCD)
22) If the position of the zero order line needs to be adjusted to the center of the CCD, adjust the grating rotation
screw. Refer to Figure 4 for location of the Grating Rotation Screw.
23) When zero order has been set, scan the SCT-320 to 546.074nm
24) Note the location of the 546.074nm mercury line. If it is located at pixel 670, then it does not require further
calibration. If the 547.074nm mercury line is NOT located at pixel 670, continue to the GADJUST section below.
GADJUST Procedure
25) Monochromator Control Software Main Menu. Select the OPERATION button.

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26) Set the Jog pull down menu to Scan Rate and Scan Speed to 10nm/min.
27) With the CCD running in continuous or focus mode, use the Up/Down Jog Buttons to position 547.074nm at the
center of the CCD.
28) Note the wavelength displayed in Wavelength box located to the left of the Goto button.
29) Return to the MAIN MENU by selecting the RETURN button.
30) Select the GADJUST button.

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Wavelength Gadjust Menu.
31) Select 546.074nm from the Mercury Lines pull down menu.
32) Enter the wavelength determined in Step 28 above.
33) Press the Calculate Gadjust button. This returns the Calculated Gadjust number shown in the Gadjust box at the
left side of the screen.
34) Press the Store New Gadjust button. This stores the new Gadjust value and re-initializes the SCT-320.
35) With the CCD running in continuous or focus mode, check the position of 0.0nm and 546.074nm.
NOTE: WHEN THE SCT-320 INITIALIZES, IT WILL RETURN TO THE FIRST GRATING OF THE
TURRET INSTALLED. MAKE SURE YOU SELECT THE DESIRED GRATING FOR ANY FURTHER
GADJUST CHANGES.