Accession Number : ADA313809

Title :   A Chronocyclic Spectrometer for Nanoscale Studies.

Descriptive Note : Final rept. 1 Jul 95-30 Jun 96,

Corporate Author : OREGON UNIV EUGENE DEPT OF PHYSICS

Personal Author(s) : Raymer, Michael G. ; Sercel, Peter C.

PDF Url : ADA313809

Report Date : 19 AUG 1996

Pagination or Media Count : 8

Abstract : The goal of the project is to implement a novel type of optical detection system for simultaneous time, frequency, and space resolved measurements of nanoscale phenomena: the Balanced Homodyne Chronocyclic Spectrometer. This system uses balanced, optical homodyne detection, with a wavelength tunable, pulsed local oscillator field, coupled with pinhole aperture spatial selection, to time resolve the spectrum of light emitted from photoexcited nanoscale structures. The main task for the grant period was the construction of the laser source and spectral filters for the chronocyclic spectrometer. This system consists of a self modelocked cavity dumped titanium:sapphire (TiS) laser which produces 50 nJ pulses of 13 fsec duration with a 100 nm bandwidth centered at 800 nm. This bandwidth is utilized to generate independently tunable pump and local oscillator pulses by splitting the oscillator output and spectrally filtering each of the two resulting beams. Construction of a TiS regenerative amplifier for situations where higher pulse energies are required is nearly complete. We have also developed pinhole mask fabrication techniques necessary to define a nanometer-scale region of optical excitation or signal collection in our samples.

Descriptors :   *OPTICAL DETECTION, *MODE LOCKED LASERS, *LIGHT AMPLIFIERS, TUNING, SYNCHRONISM, SPATIAL FILTERING, SPECTROMETERS, LOCAL OSCILLATORS, REGENERATION(ELECTRONICS), HOMODYNE RADIO RECEIVERS.

Subject Categories : Electrooptical and Optoelectronic Devices
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE