Performance of Alpha, Beta, Delta, and Theta wave across the brain finish some simple mathematical calculation, in this case 15*18

Measured electric field distribution at the depth of 5mm

QCL ridge waveguide and BH (buried-heterostructure) waveguide

3-D view of a QCL laser mesa prepared for BH regrowth

MOCVD reactor and glove box (wafer loading and operation area)

Deep etched gratings (grating pitch ~755nm, etching depth ~400nm)

QCL arrays (5 emitters, center-to-center distance ~26um, ridge width ~12um)

BH re-growth for a QCL

Assembly of tunable DBR QCL

Electrical derivative measurement of QCL