Constant-bandwidth scanning of the Czerny–Turner monochromator

Abstract

For the convenience of monochromator users, the constant-bandwidth operation of a Czerny-Turner monochromator is reviewed and clarified for continuously variable and for discretely variable slit widths. A procedure for selecting the discrete slit widths that are necessary for nearly constant-bandwidth scanning is presented.

Dispersive spectral-domain two-beam interference analysed by a fibre-optic spectrometer

“…Most recently, a white-light spectral interferometric technique has been used to measure the wavelength dependence of the spectral bandpass of the spectrometer [8]. Moreover, the constant-bandwidth operation of the Czerny-Turner monochromator has been reviewed [9].…”

“…Among the functions and parameters characterizing spectrometers, response functions and bandpasses are the most important. Time-domain and spectral-domain interferometric techniques [2,3], including the applications of Fabry-Perot and Michelson interferometers or prism-and grating-based spectrometers, play key roles in measuring not only the temporal coherence functions and the spectra of light sources, but also the parameters and characteristics of the spectral instruments [4][5][6][7][8][9]. Thus, instrument functions [4], modulation transfer functions [5] and spectral slit widths of a grating [5] and a prism spectrometer [6] have been measured or determined for given spectrometer slit widths.…”

Measuring a spectral bandpass of a fibre-optic spectrometer using time-domain and spectral-domain two-beam interference

“…Thus, the instrument functions [5], the modulation transfer functions [6] and the spectral slit widths of a grating [6] and a prism spectrometer [7] have been measured or determined for given slit widths of the spectrometer. More recently, the constant-bandwidth operation of the Czerny-Turner monochromator has been reviewed [8].…”

“…Thus, the instrument functions [5], the modulation transfer functions [6] and the spectral slit widths of a grating [6] and a prism spectrometer [7] have been measured or determined for given slit widths of the spectrometer. More recently, the constant-bandwidth operation of the Czerny-Turner monochromator has been reviewed [8].In this contribution, the theoretical results of the previous paper [7] are used to evaluate spectral bandpasses of a miniature spectrometer with three read bres of di erent core diameters. We use the fact that the visibility function for both the spatial and spectral interference fringes, that is, the visibility as a function of the optical path di erence (OPD) between beams in the interferometer is within the…”

<title>Time-domain and spectral-domain two-beam interference under general measurement conditions</title>

“…Standard time-domain interferometric techniques,1' 2 including the applications of FabryPerot or Michelson interferometers and a new photorefractive grating method,4 are .used in measuring the temporal coherence functions of cw multimode and single-mode laser diodes. Standard spectral measurement techniques use prismand grating-based spectrometers, spectrum analyzers with a Fabry-Perot interferometer, Fourier-transform 1 2 and new acousto-optic tunable filter-based 5 However, time-domain and spectral-domain low-coherence interferometry has resolved limitations in a number of applications610 and recently it has been also used to obtain parameters and characteristics of spectral instruments alone.1143 Thus, the instrument fu1 the modulation transfer functions and the spectral slit widths of a grating spectrometer12 have been measured or determined for given slit widths of the spectrometer, and the constant-bandwidth operation of the Czerny-Turner monochromator has been reviewed as 13 In this paper, the theoretical and experimental analysis of time-domain and spectral-domain interference of two light beams from a source of a multimode spectrum has been performed and the effect of a variable spectral bandpass of a detecting system consisting of a monoçhromator and a broadband detector is included in the evaluation the visibility functions of both the spatial and spectral interference fringes. The time-domain theoretical analysis shows that the analytic expression for the visibility function measured in a two-beam interference experiment with a monochromator of a variable response function and a broadband detector is similar to that measured with the broadband detector alone; the difference is only in parameters such as the width of individual peaks and the width of the envelope of the peaks in the corresponding visibility dependence.…”