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We present spectrograph design details and initial radial velocity resultsfrom the PRL optical fiber-fed high-resolution cross-dispersed echellespectrograph (PARAS), which has recently been commissioned at the Mt Abu 1.2 mtelescope, in India. Data obtained as part of the post-commissioning tests withPARAS show velocity precision better than 2m/s over a period of several monthson bright RV standard stars. For observations of sigma-Dra we report 1.7m/sprecision for a period of seven months and 2.1m/s for HD 9407 over a period of2 months. PARAS is capable of a single-shot spectral coverage of 3800A - 9500Aat a resolution of about 67,000. The RV results were obtained between 3800A and6900A using simultaneous wavelength calibration with a Thorium-Argon (ThAr)hollow cathode lamp. The spectrograph is maintained under stable conditions oftemperature with a precision of 0.01 - 0.02C (rms) at 25.55C, and enclosed in avacuum vessel at pressure of 0.1 +/-0.03 mbar. The blaze peak efficiency of thespectrograph between 5000A and 6500A, including the detector, is 30%; and about25% with the fiber transmission. The total efficiency, including spectrograph,fiber transmission, focal ratio degradation (FRD), and telescope (with 81%reflectivity) is about 7% in the same wavelength region on a clear night withgood seeing conditions.

The PRL Stabilized High Resolution Echelle Fiber-fed Spectrograph: Instrument Description & First Radial Velocity Results