Multi-wavelength external cavity laser for non-fluorescence raman spectrometer

A Raman spectrometer and multi-wavelength technology, applied in the direction of lasers, laser devices, laser components, etc., can solve the problems of inconvenient multi-wavelength switching and adjustment, weak output wavelength repeatability, complex tuning structure, etc., to eliminate unreliability, The tuning structure is simple and stable, and the effect of improving tuning accuracy

CN105552713AActive Publication Date: 2016-05-04SUZHOU UNIV
6 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-05-04

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a multi-wavelength external cavity laser for a non-fluorescence raman spectrometer. More than two laser diodes with equal central wavelengths in an array are driven to be independently opened and closed through a power supply switching circuit; output light beams are calibrated into parallel collimated laser beams through a collimating laser calibration optical element; a special design is adopted by a grating; different grating periods are set for incident point regions, corresponding to the collimated laser beams, of the grating; the collimated laser beams form zero-order reflected beams and first-order diffracted beams after being diffracted by the grating; the zero-order reflected beams are output in the same direction and have a wavelength difference; the first-order diffracted beams return to the inside of the corresponding laser diodes along the original path to participate in internal mode competition of a resonant cavity; and the zero-order reflected beams are converged into an optical fiber combiner through an optical fiber coupling lens for wavelength output. The wavelength output is switched by the circuit, so that the unreliability and the possible error of conventional mechanical adjustment are eliminated; a tuning structure is relatively simple and stable; high stability of output wavelengths is ensured; the wavelength output repeatability in actual operation is high; and the tuning accuracy is relatively high.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to an external cavity laser emitting device, in particular to a multi-wavelength external cavity laser used for a non-fluorescent Raman spectrometer. Background technique

[0002] At present, Raman spectroscopy is widely used in field detection, drug analysis, pesticide detection and other fields. However, in the process of detecting pesticides, drugs, explosives, etc., Raman spectra are interfered by strong fluorescence. The Raman light intensity is so much smaller than the fluorescence intensity that it is overwhelmed by the fluorescence and cannot detect the Raman spectrum. Therefore, it is necessary to suppress fluorescence in order to efficiently detect Raman spectrum.

[0003] At this stage, there are many methods to suppress fluorescence, the main method is baseline correction. Baseline correction is to fit the fluorescent background in the spectrogram through a specific algorithm and subtract it. Due to fitting errors,...

Examples

Embodiment

[0036] Example: Combine Figure 4 Shown is a specific embodiment of the multi-wavelength external cavity laser used in the non-fluorescent Raman spectrometer of the present invention. Specifically, it is a dual-wavelength external cavity laser, which is output by a parallel laser emitting device, a grating, and an optical fiber. Composed of devices and controllers.

[0037] The parallel laser emitting device in this embodiment is composed of a laser diode array, a fast-axis collimating mirror 4 and a microlens array, and the fast-axis collimating mirror 4 and the microlens array constitute a collimating laser calibration optical element. The laser diode array is composed of two laser diodes 1 arranged side by side with the same central wavelength (of course, this is only an example, and the present invention is not limited to the scheme of arranging two laser diodes, which can be three, four, or even More), the microlens array is arranged opposite to the laser diode array, th...