Optics Development Plan

[vredwine]

Need a plan for optics development, especially what to purchase and where to set it up (Zhong lab)

[knightss27]

I think this is slightly out of date, but it is a general overview:

[vredwine]

DON'T TRUST WHAT HAS ALLEGEDLY BEEN ORDERED Mounted Optics necessary for test bench setup:

• LENS 25.4mm LA1131-ML: https://www.thorlabs.com/thorproduct.cfm?partnumber=LA1131-ML (on 1/28 PO)
• UNMOUNTED LENS 9mm LA1576-B: https://www.thorlabs.com/thorproduct.cfm?partnumber=LA1576-B
• Corner-mounted mirror
• DICHROIC 12.7mm DMLP900T: https://www.thorlabs.com/thorproduct.cfm?partnumber=DMLP900T (on 1/28 PO)
• LENS 12.7mm LA1207-ML: https://www.thorlabs.com/thorproduct.cfm?partnumber=LA1207-ML
• ALTERNATE QC LENS (can't find other) https://www.thorlabs.com/thorproduct.cfm?partnumber=LA1540-ML (on 1/28 PO)
• 30mm Mounting Components (as necessary): https://www.thorlabs.com/navigation.cfm?guide_id=2004
• (TRANSMISSION DETECTION) Something to shine the laser onto: https://www.thorlabs.com/thorproduct.cfm?partnumber=R1L1S5P (probably unnecessary)
• (RECEIVING DETECTION/QC placeholder) Camera to record laser spot (Zhong's IR camera)

Not seeing the 9mm LA1576 in mounted version, may have to buy bare and mount (or can just use 1207)

[knightss27]

Need to decide how we are going to test transmission and receive lasers?

Tx: A laser with good enough coherence basically, just to shine out the system.

Rx: Maybe a little board with an array of LEDs, just to try and focus down to a reasonable point. Otherwise just an OK laser that we can expand to be greater width than the aperture.

[vredwine]

For Tx, we should definitely match our actual wavelength (785nm) and ask Tian if he has any kind of diode mount (such as https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5583) so that we can buy a standalone diode rather than a full package.

[vredwine]

I think this is slightly out of date, but it is a general overview:

The FSM diameter will only be 6.4mm as we need the increased tilt ability which is only available for smaller mirrors.

[vredwine]

New Optics to result in collimated beam of <4.17mm to accomodate 6.4mm FSM

• 1" f1: 99.7mm and 1/2" f2: 14.8mm gives us 3.8mm beam
• 1" f1: 74.8mm and 9mm f2: 12mm gives us 4.07mm beam (better)

https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=112

[knightss27]

Those are both probably too long. I wrote a little script to optimize Edmund Optics' catalogue for <100mm length and a spot size of <= 4.1mm. Here are some of the options:

Looks to me like if we could possibly get 58.8mm length working (I am worried that the 8mm diameter lens could have issues with the beam when moved off-axis) then this would be wonderful. This is the second row on that sheet.

[vredwine]

• FSM Documentation from Mirrorcle:
  • https://www.mirrorcletech.com/pdf/Mirrorcle_MEMS_Packages_and_Mounts_-_User_Guide.pdf
  • https://www.mirrorcletech.com/documentation/Guides/PDF%20Resources.html
• Looks like we're going to want the TINY48.4 PCB attached to the FSM and MOUNT-TINY.4-KMS to put it onto the breadboard https://www.mirrorcletech.com/pdf/Mirrorcle_MEMS_Packages_and_Mounts_-_User_Guide.pdf
• Need this (or something like it on the actual sat) to control the FSM https://www.mirrorcletech.com/pdf/Mirrorcle_MiniMZ_MEMS_Controller_-_User_Guide.pdf

[vredwine]

OUTGOING BEAM IS EXPANDED BY TELESCOPE, DROPS LINK BUDGET BY POSSIBLY 10dB

[knightss27]