=====H1=====
This is the first grating image device. It is a three mask process over 200nm of deposited Al.

After mask one the resist looked like this:

{{:samples:h1_sign.jpg?200|Sign}}

{{:samples:h1_gratings.jpg?200|Grating Image}}

{{:samples:h1_gratings_closeup.jpg?200|Grating Image Closeup}}