A caracterização de laser de diodo para espectroscopia de alta resolução

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

In the last decade the diode lasers became the most important in economics. The use of diode lasers in Physics and Technology has expanded rapidly. This has occurred because their low cost, reliability , durability and possibility of integrating with electronic components to form integrated optoeletronic circuits. The development of novel techniques to control and narrow their spectral outputs and large wavelength coverage make diode lasers an alternative to other lasers more expensive in many experiments of atomic physics as high resolution spectroscopy, cooling and trapping atoms. Many atoms of metrological interest have transitions in the frequency region covered by diode lasers as rubidium and cesium. We characterize one diode laser Sharp LT 024 in a cavity allowing an operation in temperatures between 240 K to room temperature. This laser operate in 780 nm region, 30 mW of power and operating current 75 mA. First we did the characterization in power and threshold current. Following the characterization in wavelength, using a l-meter. We measured the tuning range in function of temperature and current and their line width (50 MHz) .We present some spectra of molecular iodine and to this purpose we made a oven to heat the iodine cell to get better signal noise ratio measures. To narrow the laser output we put the laser in an external cavity using a grating in Littrow configuration. Then, we measured the laser in external cavity line width and obtained the spectral narrowing by optical feedback. Again we present some spectra of iodine with the laser in external cavity in the same region of the first

ASSUNTO(S)

lasers semicondutores iodo

ACESSO AO ARTIGO

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