Light splitting excitation module

Abstract

The light splitting excitation module provided by the utility model can realize characteristic spectrum excitation and collection of light with the bandwidth less than 0.1 nm on a sample at a focal point by carrying out wavelength selection on a broadband spectrum light source, is suitable for Raman spectrum excitation and other applications, can replace a laser under specific conditions, and can realize output of any wavelength in a range of 200-1100 nm.

Description

Technical Field

[0001] The utility model relates to optics, in particular to a light splitting excitation module. Background Art

[0002] In the design, debugging and production of optical instruments, a light source with narrow line width and continuously adjustable output wavelength is crucial. Although existing light sources such as mercury lamps and argon lamps have a series of narrow line width emission spectra in the range of 200-1100nm, their emission spectra are independent of each other and cannot continuously adjust the output of a specified wavelength; although the emission spectra of deuterium lamps and tungsten lamps are continuous, they do not meet the requirements of monochromatic narrow line width. Based on the spectroscopy of deuterium lamps and tungsten lamps, spectrophotometers can continuously output any wavelength between 200-1100nm, but the output line width is generally greater than 1nm, which cannot meet the requirements of narrow line width (<0.1nm). Utility Model Content

[0003] The utility model proposes a spectroscopic excitation module, which can realize characteristic spectrum excitation and collection of samples at the focus of light with a bandwidth less than 0.1nm by selecting the wavelength of a wide-spectrum light source, and is suitable for applications such as Raman spectrum excitation. Under certain conditions, the module can replace the laser and can realize arbitrary wavelength output within the range of 200nm to 1100nm.

[0004] The technical solution of the utility model is: a light splitting excitation module.

[0005] The implementation mode of the utility model is as follows: Figure 1 As shown: the spectroscopic excitation module consists of a light source, a first lens, a second lens, an incident slit, a first reflector, a second reflector, a grating, a third reflector, a fourth reflector, an exit slit, a third lens, a fifth reflector, a fourth lens, a focus, a fifth lens, and a spectrometer; the light source is a wide-spectrum point light source, which is collimated by the first lens in sequence, focused on the incident slit by the second lens, and then reflected by the first reflector and collimated by the second reflector. The grating diffracts different wavelengths to different angles, and the light of a specific wavelength is reflected and focused by the third reflector, reflected by the fourth reflector, passes through the exit slit, and then collimated by the third lens. After collimation, the light of a specific wavelength passes through the central hole of the fifth reflector and is focused on the focus by the fourth lens. The signal light generated by the sample at the focus is collimated by the fourth lens, reflected by the fifth reflector, and then focused by the fifth lens on the incident end face of the spectrometer for spectral analysis.

[0006] The light source is a wide spectrum light source, the first reflector and the fourth reflector are plane reflectors, the second reflector and the fourth reflector are concave reflectors, and the fifth reflector is a plane reflector with a hole. The grating angle can be adjusted to achieve the purpose of changing the output wavelength. The light bandwidth passing through the exit slit is less than 0.1nm.

[0007] The beneficial effects of the utility model are:

[0008] 1. A spectroscopic excitation module is proposed. By selecting the wavelength of a wide-spectrum light source, it can achieve characteristic spectral excitation and collection of samples at the focal point with a bandwidth of less than 0.1nm, which is suitable for applications such as Raman spectroscopy excitation;

[0009] 2. Under certain conditions, the module can replace the laser and can achieve any wavelength output in the range of 200nm to 1100nm. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the optical path structure of the utility model. DETAILED DESCRIPTION

[0011] The utility model is further described below in conjunction with the accompanying drawings and implementation examples.

[0012] The implementation mode of the utility model is as follows: Figure 1 As shown: the spectroscopic excitation module is composed of a light source 1, a first lens 2, a second lens 3, an incident slit 4, a first reflector 5, a second reflector 6, a grating 7, a third reflector 8, a fourth reflector 9, an exit slit 10, a third lens 11, a fifth reflector 12, a fourth lens 13, a focus 14, a fifth lens 15, and a spectrometer 16; the light source 1 is a wide spectrum point light source, which is collimated by the first lens 2 in sequence, focused on the incident slit 4 by the second lens 3, and then reflected by the first reflector 5 and the second reflector 6. Collimation: grating 7 diffracts different wavelengths to different angles. Light of a specific wavelength is reflected and focused by the third reflector 8, then reflected by the fourth reflector 9, passes through the exit slit 10, and then collimated by the third lens 11. After collimation, the light of the specific wavelength passes through the central hole of the fifth reflector 12 and is focused on the focal point 14 by the fourth lens 13. The signal light generated by the sample at the focal point 14 is collimated by the fourth lens 13, reflected by the fifth reflector 12, and then focused by the fifth lens 15 on the incident end face of the spectrometer 16 for spectral analysis.

[0013] The light source 1 is a wide spectrum light source, the first reflector 5 and the fourth reflector 9 are plane reflectors, the second reflector 6 and the fourth reflector 8 are concave reflectors, and the fifth reflector 12 is a plane reflector with a hole. The angle of the grating 7 can be adjusted to achieve the purpose of changing the output wavelength. The bandwidth of the light passing through the exit slit 10 is less than 0.1nm.

[0014] By selecting the wavelength of the wide-spectrum light source, the module can achieve characteristic spectral excitation and collection of samples at the focus point with light with a bandwidth less than 0.1nm, which is suitable for applications such as Raman spectroscopy excitation. Under certain conditions, the module can replace the laser and can achieve any wavelength output in the range of 200nm to 1100nm.

[0015] The above description is only a preferred embodiment of the utility model, and does not constitute any form of limitation to the utility model. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still fall within the scope of the technical solution of the utility model.

Claims

1. A spectroscopic excitation module, characterized in that: The invention is composed of a light source, a first lens, a second lens, an incident slit, a first reflector, a second reflector, a grating, a third reflector, a fourth reflector, an exit slit, a third lens, a fifth reflector, a fourth lens, a focus, a fifth lens and a spectrometer; the light source is a wide-spectrum point light source, which is collimated by the first lens in sequence, focused on the incident slit by the second lens, then reflected by the first reflector, collimated by the second reflector, and diffracted by the grating to different wavelengths to different angles; light of a specific wavelength is reflected and focused by the third reflector, reflected by the fourth reflector, passes through the exit slit, and then collimated by the third lens; after collimation, light of a specific wavelength passes through the central hole of the fifth reflector and is focused on the focus by the fourth lens; the signal light generated by the sample at the focus is collimated by the fourth lens, reflected by the fifth reflector, and then focused on the incident end face of the spectrometer for spectral analysis.

2. A spectroscopic excitation module according to claim 1, characterized in that: The first reflector and the fourth reflector are plane reflectors.

3. The spectroscopic excitation module according to claim 1, characterized in that: The second reflecting mirror and the fourth reflecting mirror are concave reflecting mirrors.

4. The spectroscopic excitation module according to claim 1, characterized in that: The fifth reflector is a plane reflector with a hole.

5. The spectroscopic excitation module according to claim 1, characterized in that: In order to achieve the purpose of changing the output wavelength, the grating angle is adjusted.

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