focal length of thermal lens

effective thermal focal length

Thermal focal length

Thermal focal lens

graded focal length lens

long focal length lens

long focal-length lens

short focal length lens

short focal length lens (=short-focus lens)

telephoto lens focal length

variable focal length lens

ellipsoidal thermal lens

Laser thermal lens spectrometry

Laser thermal lens spectrophotometry

near field laser thermal lens spectrometry

the thermal lens effect

Thermal Focal Distance

thermal length expansion

Thermal lens