[[image:Rail.JPG|thumb|left|Fig. 5. Open-source rail]]
* Shown on the left is an improved open-source sample holder for pieces of semiconductor wafers . Instead of the clamping a sample, it provides a 2mm lip that allows samples to fluently sink into the slot. The purpose of the design is to make sample switching faster and easier, and reduce abrasion caused by frequent sample switch. Also notice the hemisphere hole in the backside makes it easier for tweezers work.
* On the right is the improved fiber holder is a dual-channel fiber switcher, which attaches two fiber optic cable to a 8mm smooth rod and allow easy switching between cables for optical experiments.
==== Further improvement ====
# A component for a low temperature liquid to cool the sample during data taking. # The addition of a optical chopper and lock-in amplifier would improve signal to noise ratio # A monochromator would allow the system to focus on a small range of wavelengths at a time instead of looking a wide range of wavelengths.
As part of the open source optics project we will be designing all of these components.
== To operate ==
* [[PL data curve fitting:QAS]]
* [[Photoluminescence literature review]]