blue-shift of optical band gap

optical band gap

optical band-gap

width of optical forbidden band

forbidden band gap

forbidden band-gap

broad band optical source

C+L band optical transmission

narrow-band optical bandpass filter

optical band

optical energy band gap

optical gap

optical-optical conversion efficiency

Optical-optical double resonance

optical-optical double resonance(OODR)

pass-band optical fliter

the optical gap

THz-band optical parameters

wide-band optical frequency translation