A spectral beam splitting measurement method and device for a supercontinuum light source

Abstract

A spectral beam splitting measurement method and device for a supercontinuum light source, using three optical fiber collimators and a long-pass filter or a short-pass filter, the supercontinuum output by the supercontinuum light source through a pigtail passes through an optical fiber The collimator is collimated and then incident on the long-wave pass filter or short-wave pass filter. According to the cut-off wavelength of the long-wave pass filter or short-wave pass filter, it is divided into two parts: long-wave and short-wave. The light sheet or short-pass filter transmits or reflects, and the transmitted or reflected two-way light is coupled into the object to be measured through a fiber optic collimator respectively, and then two spectrometers with corresponding ranges are used to measure the measured object at the same time. The transmission spectrum of the object. The invention realizes the ultra-broadband seamless measurement by simultaneously using the grating spectrometer in the whole spectrum range of the super-continuum light source. The device of the invention does not need to adjust the optical path to replace different narrow-band filters before each measurement, which not only saves time and labor, reduces costs, but also increases the stability and reliability of the device.

Description

technical field [0001] The invention relates to a spectral beam splitting measurement method and device. In particular, it relates to a spectral beam splitting measurement method and device for a supercontinuum light source which utilizes a volume optics device to split the long and short wave components of the supercontinuum to facilitate simultaneous measurement in the entire spectral range. Background technique [0002] The transmission process of optical pulses in nonlinear media is not only affected by such factors as self-phase modulation (SPM), cross-phase modulation (XPM), four-wave mixing (FWM), stimulated Raman scattering (SRS) and stimulated Brillouin The influence of various nonlinear effects such as scattering (SBS) is also affected by the dispersion characteristics of the medium. Under the combined effect of nonlinear effects and dispersion, new frequency components are generated. For sufficiently strong pulses, the spectrum can be broadened by more than hund...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is also obvious

On the one hand, the spectral components within the cut-off band of the narrow-band filter will be completely lost and cannot be applied

This not only greatly wastes the spectral width of the supercontinuum light source, but also weakens its advantages over traditional narrowband light sources

On the other hand, in order to meet the needs of ultra-broadband measurement, the above scheme must require several narrow-band filters, which not only increases the cost of the device, but also needs to readjust the optical path every time a narrow-band filter is replaced, which is time-consuming and laborious

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