公开(公告)号：CA1136893A

公开(公告)日：1982-12-07

申请号：CA355797

申请日：1980-07-09

Applicant: IBM

Inventor： BETHUNE DONALD S ,  LANKARD JOHN R ,  LOY MICHAEL M T ,  SOROKIN PETER P

IPC: G01J3/44 ,  H01S3/30 ,  G01J3/12

Abstract: TIME-RESOLVED INFRARED SPECTRAL PHOTOGRAPHY An intense broadband continuum light pulse of uniform spectral intensity and short time duration is generated, then downconverted in frequency to a region of interest, preferably in the infrared region, by applying it as a pump pulse to a molecular or atomic vapor so as to induce stimulated Raman scattering. The resulting uniform spectral intensity distribution Raman Stokes pulse is then used to probe a sample. The sample converts the distribution of the probe pulse into a nonuniform spectral intensity distribution which contains the absorption spectrum of the sample. This spectrum pulse has the same spectral bandwidth and time duration as the Raman Stokes pulse and is finally upconverted in frequency to a region where the spectrum pulse can be conveniently recorded. This is done with a four-wave Raman mixing process in an alkali metal vapor. The vapor is simultaneously pumped with the spectrum pulse and with a second pumping light pulse (or beam) having a frequency in the vicinity of a suitable resonance line of the vapor so as to induce SERS. In the alkali metal vapor, the resulting Raman Stokes pulse and spectrum pulse beat together with the second pumping light pulse to produce an upconverted pulse at a higher frequency band, which surprisingly also tends to have the same spectral bandwidth, intensity distribution (spectrum) and time duration as the spectrum pulse. The upconverted pulse is then recorded either photographically or photoelectrically with conventional spectrographic apparatus. YO9-79-063

公开(公告)号：CA1169530A

公开(公告)日：1984-06-19

申请号：CA389501

申请日：1981-11-05

Applicant: IBM

Inventor： BETHUNE DONALD S

IPC: G02B17/00 ,  F24S23/77 ,  G02B19/00 ,  G02B27/00 ,  H01S3/02 ,  H01S3/091 ,  H01S3/0915 ,  H01S3/094 ,  H01S3/20 ,  H01S3/213 ,  H01S3/093

Abstract: APPARATUS FOR FOUR SIDE TRANSVERSE ILLUMINATION OF A REGION A right angle corner reflector is used to reflect different parts of a single incident collimated radiation beam such that a cylindrical region is equally irradiated transversely from four directions. The cylindrical region is positioned such that rays which strike the intersection of the corner reflector surfaces are tangent to the side of the cylindrical region. The cylindrical region is spaced from the corner reflector such that one quarter of the radiation incident upon the cylindrical region strikes the region directly, one quarter is first reflected from one of the corner reflector surfaces, one quarter is first reflected from the other corner reflector surface, and one quarter is reflected from first one and then the other corner reflector surface before striking the cylindrical region.