Wide-spectrum band-pass type electric adjustable spectrum selector
By designing a wide spectrum band-based electric adjustable spectral selector, the combination of fiber collimator, D-shaped mirror, grating, lens, rotating blade, roof mirror and electric motor is solved, and the shortcomings of existing spectral filtering equipment are solved in terms of power, selectivity and cost, achieving high selectivity, low cost and high efficiency spectral filtering effects.
Patent Information
- Application Number
- CN202420739244.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-11
AI Technical Summary
When implementing spectral filtering, existing spectral filtering equipment has problems such as limited tolerance power, wavelength and bandwidth of the passband center are related to the incident angle, filtering effect is susceptible to environmental impact, high cost, high complexity and poor out-of-band extinction.
A wide spectrum band-based electric tunable spectral selector is designed, using a combination of fiber collimator, D-shaped reflector, grating, lens, rotating blade, roof mirror and electric motor. Through the light-through window design of the rotating blade and the control of the electric motor, rapid tuning and high selective filtering of the output spectrum are achieved.
It realizes flexible selection of the center wavelength and bandwidth of the output spectrum, has an extremely high out-of-band extinction ratio, and the filtering effect is not easily affected by the external environment, reducing the complexity and cost of the system, and improving the flexibility and accuracy of spectral selection.
Smart Images
Figure CN222598969U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of spectrum selectors, in particular to a wide spectrum bandpass type electrically adjustable spectrum selector. Background Art
[0002] Supercontinuum lasers have been widely used in biomedicine, spectroscopy, air pollution monitoring, optoelectronic countermeasures and other fields due to their ultra-wide and stable spectrum. For specific application scenarios, the central wavelength and bandwidth of the spectrum required are also different. Therefore, the spectral filtering equipment at the back end of the supercontinuum light source is particularly important in practical applications.
[0003] At present, there are three main methods to achieve spectral filtering; the first method is to use filters or dichroic mirrors (short pass, long pass, band pass) for spectral filtering. The filters have a high transmittance to the spectral components in the passband range and a high isolation to the blocking band, thereby achieving filtering of the input spectrum; the dichroic mirror divides the light beam into transmitted light and reflected light according to the starting wavelength and the cut-off wavelength; the second method is to use a monochromator based on a diffraction grating or a dispersion prism, and tune the central wavelength of the output spectrum by rotating the grating (or prism) angle, and change the bandwidth of the output spectrum by adjusting the width of the input and output slits; the third method is to use an acousto-optic tunable filter based on the principle of acousto-optic interaction, and adjust the wavelength and intensity of the transmitted light by changing the RF frequency and power.
[0004] Disadvantages of the existing technology: First, both the filter and the dichroic mirror achieve filtering by coating on the substrate, which results in limited power tolerance of the filter and the dichroic mirror, and the passband center wavelength and bandwidth are related to the incident angle, and the filtering effect is easily affected by the deviation of the incident angle. Secondly, the monochromator and the acousto-optic tunable filter system are relatively complex and relatively expensive, and the out-of-band extinction of the acousto-optic tunable filter is poor. Finally, the filter, dichroic mirror and acousto-optic tunable filter are limited by the coating materials, coating processes and acousto-optic crystals, resulting in limited filtering center wavelength and bandwidth, making the filtering effect lack flexibility and selectivity. Utility Model Content
[0005] The purpose of the utility model is to provide a wide spectrum band pass type electrically adjustable spectrum selector to solve the problems raised in the above background technology.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wide-spectral bandpass electrically adjustable spectrum selector, comprising a fiber optic collimator, a D-shaped reflector, a grating, a lens, a rotating blade, a roof mirror and an electric motor, wherein the fiber optic collimator, the D-shaped reflector, the grating, the lens, the rotating blade and the roof mirror are arranged in sequence, and the fiber optic collimator, the D-shaped reflector, the grating, the lens, the rotating blade and the roof mirror correspond to each other in sequence, and the rotating blade is mounted on the electric motor.
[0007] Preferably, the optical fiber collimator is fused with a supercontinuum laser output pigtail by a fiber fusion splicer.
[0008] Preferably, the rotating blade is provided with a plurality of corresponding light-transmitting windows on the same blade, or a plurality of blades are respectively provided with a corresponding single light-transmitting window.
[0009] Preferably, the electric motor is electrically connected to a computer.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] First, due to the arrangement of the diffraction grating and lens collimation of the present invention, the light-transmitting window of the rotating blade can be custom designed according to the required output spectrum, providing more selectivity for the central wavelength and bandwidth of the output spectrum.
[0012] Second, due to the setting of the rotating blade light-transmitting window of the present invention, there is almost no loss to the spectral components of the passband band, and the spectral components outside the passband range are physically blocked, so it has an extremely high out-of-band extinction ratio, and the filtering effect is not easily affected by the external environment.
[0013] Third, due to the setting of the electric motor of the present invention, the rotating blades with different spectral selections can be switched quickly, which improves the flexibility of spectral selection and does not require complex optical path adjustment and RF power supply systems, effectively reducing the cost and complexity of the system and ensuring the working stability of the spectral filtering system. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of a wide spectral bandpass electrically adjustable spectral selector.
[0015] In the figure: 1. Fiber collimator; 2. D-shaped reflector; 3. Grating; 4. Lens; 5. Rotating blades; 6. Roof mirror; 7. Electric motor. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] See also Figure 1 The utility model provides a technical solution: a wide-band pass-through electrically adjustable spectrum selector, comprising a fiber collimator 1, a D-shaped reflector 2, a grating 3, a lens 4, a rotating blade 5, a roof mirror 6 and an electric motor 7. The fiber collimator 1, the D-shaped reflector 2, the grating 3, the lens 4, the rotating blade 5 and the roof mirror 6 are arranged in sequence, and the fiber collimator 1, the D-shaped reflector 2, the grating 3, the lens 4, the rotating blade 5 and the roof mirror 6 correspond to each other in sequence. The rotating blade 5 is installed on the electric motor 7. The collimated light output by the fiber collimator is spatially separated by wavelength after diffraction by the grating. The position and size of the light-passing window of each blade determine the central wavelength and bandwidth of the passband. Therefore, the central wavelength and bandwidth of the spectrum selector passband are not limited, have high out-of-band extinction and are almost unaffected by changes in environmental factors such as temperature or humidity. In addition, the rotating blade is installed on the electric motor and can be connected to an external computer for communication control. Therefore, the output spectrum can be quickly changed by electrically controlling the rotation of the rotating blade, and the wavelength selection has high flexibility and accuracy. On the other hand, the spectrum selector does not need to adjust the optical path during the wavelength tuning process, so there is no beam deviation or deviation, and it has a simple structure and low cost, and can be packaged as a small device.
[0018] Preferably, the optical fiber collimator 1 is fused with a supercontinuum laser output pigtail by a fiber fusion splicer.
[0019] Preferably, the rotating blade 5 can design the position and size of the light-transmitting window according to the central wavelength and bandwidth of the required output spectrum. For the situation where multiple spectral ranges need to be output simultaneously, corresponding multiple light-transmitting windows can be set on the same blade; for the situation where multiple spectral ranges need to be output separately, corresponding single light-transmitting windows can be set on multiple blades respectively.
[0020] Preferably, the electric motor 7 is electrically connected to a computer, and the electric motor and the computer perform communication control, and the rapid switching of the output spectrum is achieved by electrically controlling the rotation of the rotating blades.
[0021] The utility model: an optical fiber collimator 1 and a supercontinuum laser output fiber are fused by an optical fiber fusion splicer, a supercontinuum light source is output from the optical fiber collimator 1 and reaches the grating 3, is diffracted by the grating 3 and reaches the lens 4, a diffraction spot is collimated by the lens 4 and reaches the rotating blade 5, the light at the light window on the rotating blade 5 passes through without loss, and the light at other positions of the blade is blocked and cannot pass through, thereby achieving a spectrum selection effect, the transmitted light after the rotating blade 5 reaches the roof mirror 6, the light height is reduced after two reflections by the roof mirror 6, and then reaches the rotating blade 5 again, reaches the lens 4 again after the rotating blade 5, reaches the grating 3 again after convergence by the lens 4, reaches the D-shaped reflector 2 after diffraction by the grating 3, is reflected by the D-shaped reflector 2 and output, and finally achieves a spectrum filtering effect.
[0022] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the utility model have been shown and described, it is understandable to those of ordinary skill in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.
Claims
1. A wide-bandpass electrically adjustable spectrum selector, characterized in that: The optical fiber collimator (1), a D-shaped reflector (2), a grating (3), a lens (4), a rotating blade (5), a roof mirror (6) and an electric motor (7); the optical fiber collimator (1), the D-shaped reflector (2), the grating (3), the lens (4), the rotating blade (5) and the roof mirror (6) are arranged in sequence, and the optical fiber collimator (1), the D-shaped reflector (2), the grating (3), the lens (4), the rotating blade (5) and the roof mirror (6) correspond to each other in sequence; and the rotating blade (5) is mounted on the electric motor (7).
2. The wide-bandwidth electrically adjustable spectrum selector according to claim 1, characterized in that: The optical fiber collimator (1) is fused with a supercontinuum laser output pigtail by means of an optical fiber fusion splicer.
3. The wide-spectrum-bandpass electrically adjustable spectrum selector according to claim 1, characterized in that: The rotating blade (5) is provided with a plurality of corresponding light-transmitting windows on the same blade, or a plurality of blades are respectively provided with a corresponding single light-transmitting window.
4. The wide-bandwidth electrically adjustable spectrum selector according to claim 1, characterized in that: The electric motor (7) is electrically connected to a computer.