More information on the OPO spectrometer
 
 
 
 
Pump laser and an OPO crystal		  
OPO crystals used for NIR operation
 
Optics used in the OPO apparatus		  
The Optics bench
The beam path through the OPO crystals (illustration)
 
The intensity of the laser source is so high that we can obtain satisfactory spectra through a 5 mm pinhole in front of the sample.

An article describing our prototype is available:
    Wang Z, Rossman GR, Blake GA (1998)  A new microsampling visible-infrared spectrometer based on optical parametric oscillators (OPOs).  Spectroscopy 13:44-47.