RECEIVERDEVELOPMENTFOR300-3000 GHzREGION

Limitations imposed bytheatmosphere atterahertz (THz)frequencies haverestricted researchers from retrieving crucial information regarding astronomical sources. Withtheavailability ofsensitive detectors and new generation of telescopes, the terahertz instrumentation hasimproved drastically overthepast twodecades. Highspectral resolution information retrieved fromstar forming molecular system isvery essential inunderstanding themodel ofevolution process ofstars andgalaxies. Inthis paper, wewill present the development ofaSubmillimeter wave(300-3000 GHz) receiver system tostudy interstellar molecular clouds dynamics andchemistry. Terahertz (THz)region isthebestpartofthe electromagnetic spectrum forobserving keymolecules in space [1-3]. Morethan130molecules havealready been detected sofarintheinterstellar medium. These include manyforms ofwater andorganic molecules thought tobe necessary forlife. Terahertz technology haslong interested astronomers because "approximately one-half ofthetotal luminosity and98%ofthephotons emitted since theBigBangfall into thesubmillimeter andfarinfrared [4]. Molecular lines areexcellent probes of physical andchemical conditions ininterstellar clouds, protostar envelopes, circumstellar shells around late-type stars, andphoton dominated regions.