CN217689613U - Optical path system of rapid scanning device - Google Patents
Optical path system of rapid scanning device Download PDFInfo
- Publication number
- CN217689613U CN217689613U CN202221679303.7U CN202221679303U CN217689613U CN 217689613 U CN217689613 U CN 217689613U CN 202221679303 U CN202221679303 U CN 202221679303U CN 217689613 U CN217689613 U CN 217689613U
- Authority
- CN
- China
- Prior art keywords
- light source
- retroreflector
- optical path
- receiving module
- voice coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a quick scanning device's optical path system relates to terahertz technical field now, including the bottom plate and locate voice coil motor on the bottom plate, cavity retroreflector, light source emission module and light source receiving module, voice coil motor is connected with the cavity retroreflector for drive cavity retroreflector removes along the optical axis direction, and light source emission module locates on the input light path of cavity retroreflector, and light source receiving module sets up on the output light path of cavity retroreflector, and light source receiving module is located between light source emission module and the cavity retroreflector. The optical path system of the rapid scanning device of the utility model has simple structure, and the optical elements only comprise the collimator and the hollow retroreflector, thus reducing the attenuation of light in the delay line; the system debugging method is simple, non-professional operators can complete light path debugging, and the delay line device with low insertion loss, high stability and high scanning speed is realized.
Description
Technical Field
The utility model relates to terahertz technical field especially involves a quick scanning device's optical path system now.
Background
In an all-fiber terahertz time-domain spectroscopy system, a fast scanning device, namely a delay line device, needs to be connected into a receiving optical path, and the internal structure mainly comprises an input module, an output module and a reflector. The delay line realizes optical transmission delay by adjusting the length of an optical path. At present, the scanning device mainly comprises a voice coil motor delay line and a stepping motor delay line according to a motor working mechanism, wherein the stepping motor delay line has a relatively low scanning speed, and the voice coil motor delay line can realize rapid scanning. In the case of the voice coil motor, the optical elements, optical path design and structure inside the delay line are different, and as a result, various performance parameters of the delay line are different.
Because the working properties of motors in the delay line are different, the scanning speed of the delay line of the voice coil motor is higher, and the scanning optical distance of the motor is short. In addition, for the all-fiber terahertz time-domain spectroscopy system, insertion loss fluctuation, optical path length, overall performance and structural stability of the delay line have different differences, and the method mainly lies in selection or design of optical element types, such as selection and design of collimating lenses of the transmitting and receiving modules, selection of adjustable dimensions of the adjusting frame, folding mode of the optical path in the delay line and the like. When determining optical elements and optical paths, how to adjust each optical element through debugging, namely, reducing insertion loss, and reducing insertion loss fluctuation in the scanning process is also a key technical means for improving each performance. However, the difficulty in debugging the optical path inside the delay line is high, and the insertion loss variation range can be directly influenced by the structural stability while the performance is improved. And 1550nm is invisible light to human eyes, and the light path debugging difficulty is large.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a quick scanning device's optical path system for solve above-mentioned technical problem.
The utility model adopts the technical scheme as follows:
the utility model provides a quick scanning device's optical path system, includes the bottom plate and locates voice coil motor, cavity retroreflector, light source emission module and light source receiving module on the bottom plate, voice coil motor with the cavity retroreflector is connected for the drive the cavity retroreflector removes along the optical axis direction, light source emission module locates on the input light path of cavity retroreflector, light source receiving module sets up on the output light path of cavity retroreflector, just light source receiving module is located light source emission module with between the cavity retroreflector.
Preferably, the bottom plate is provided with a plurality of first fixing hole sites, and the first fixing hole sites are used for mounting the voice coil motor, the hollow retroreflector, the light source emitting module and the light source receiving module.
Preferably, the observation device further comprises an observation card, and the observation card is arranged on the output light path.
Preferably, an aspheric collimating lens and a five-dimensional adjusting frame for adjusting the position of the aspheric collimating lens are respectively arranged inside the light source emitting module and inside the light source receiving module.
Further preferably, the focal length of the aspheric collimating lens is 18.4mm, and the clear aperture on the aspheric collimating lens is 5.5mm.
Preferably, the diameter of the hollow retroreflector is 38.1mm.
Preferably, the light source emitting module and the light source receiving module are respectively provided with a plurality of second fixing hole sites.
The technical scheme has the following advantages or beneficial effects:
(1) The optical path system of the rapid scanning device of the utility model has simple structure, and the optical elements only comprise the collimator and the hollow retroreflector, thus reducing the attenuation of light in the delay line;
(2) The utility model discloses a light path system debugging method of quick scanning device is succinct, and non-professional operating personnel can accomplish the light path debugging;
(3) The utility model discloses in insert the loss < 2dB, insert the loss change < 2dB, realized low insertion loss, stability is high, the fast delay line device of scanning speed;
(4) The utility model discloses well light source emission module and the light source receiving module that sets up have the polarization maintaining nature, in full optical fiber terahertz time domain spectroscopy system now, need not to adjust the optic fibre position and ensure the polarization state.
Drawings
Fig. 1 is a schematic structural diagram of an optical path system of the middle fast scanning device of the present invention.
In the figure: 1. a light source emitting module; 2. a light source receiving module; 3. a hollow retroreflector; 4. a voice coil motor; 5. a base plate.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and "third" are only used for descriptive purposes and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic structural diagram of an optical path system of a middle fast scanning device of the present invention, please refer to fig. 1, which illustrates a preferred embodiment, the illustrated optical path system of a fast scanning device, including a bottom plate 5 and a voice coil motor 4 disposed on the bottom plate 5, a hollow retroreflector 3, a light source emitting module 1 and a light source receiving module 2, the voice coil motor 4 is connected to the hollow retroreflector 3 for driving the hollow retroreflector 3 to move along the optical axis direction, the light source emitting module 1 is disposed on the input optical path of the hollow retroreflector 3, the light source receiving module 2 is disposed on the output optical path of the hollow retroreflector 3, and the light source receiving module 2 is disposed between the light source emitting module 1 and the hollow retroreflector 3. In this embodiment, the light source emitting module 1 and the light source receiving module 2 are laser light source emitting modules and receiving modules, a point light source emitted by the light source emitting module 1 is collimated into parallel light, and is emitted by the hollow retroreflector 3 and then parallelly transmitted to the light source receiving module 2, and the light source receiving module 2 couples the parallel light to an optical fiber for output. The hollow retroreflector 3 is fixed to the voice coil motor 4, and the voice coil motor 4, the light source emitting module 1, and the light source receiving module 2 are fixed to the base plate 5.
Further, as a preferred embodiment, the bottom plate 5 is provided with a plurality of first fixing hole locations, and the first fixing hole locations are used for installing the voice coil motor 4, the hollow retroreflector 3, the light source emitting module 1 and the light source receiving module 2. In this embodiment, the voice coil motor 4, the hollow retroreflector 3, the light source emitting module 1, and the light source receiving module 2 can be matched with the first fixing hole through screws/bolts, so that the voice coil motor 4, the hollow retroreflector 3, the light source emitting module 1, and the light source receiving module 2 are fixed on the bottom plate 5, and when the dismounting is required, the screws/bolts are firstly dismounted.
Further, as a preferred embodiment, an aspheric collimating lens and a five-dimensional adjusting frame for adjusting the position of the aspheric collimating lens are disposed inside the light source emitting module 1 and inside the light source receiving module 2. Because the light source in the system is a Gaussian beam with the wavelength of 1550nm, the spatial light propagation distance inside the delay line is required to be combined with the maximum beam waist distance of the aspheric collimating lens when the aspheric collimating lens is selected, and the maximum beam waist distance is selected to be 6000mm in the embodiment, so that the long-distance and short-distance adjustability of the spatial light propagation distance inside the delay line can be realized; since the delay line in this embodiment is applied to an all-fiber system, the five-dimensional fiber coupling adjustment frame of the light source emitting module 1 and the light source receiving module 2 can maintain the polarization and perform five-dimensional adjustment of the position of the aspheric collimating lens. The light source emitting module 1 and the light source receiving module 2 are sold on the market, and the key point is that based on the selection of each parameter when the application scenes are different, in order to improve the stability of delay line output, namely reduce insertion loss change, except for the maximum beam waist distance, according to the characteristics of a Gaussian beam, the light source emitting module 1 and the light source receiving module 2 need to select a long focus to reduce the divergence angle of the Gaussian beam, but the too long focal length can cause the diameter of a collimation light spot to be too large, so the light passing apertures of the light source emitting module 1 and the light source receiving module 2 are larger than the diameter of the light spot. In this embodiment, the focal length of the aspheric collimating lens is 18.4mm, and the clear aperture of the aspheric collimating lens is 5.5mm. In other embodiments, the focal length of the aspheric collimating lens is selected to be 15.3mm, and a clear aperture of 5mm may also be used.
Further, as a preferred embodiment, the diameter of the hollow retroreflector 3 is 38.1mm. The hollow retroreflector 3 is arranged to realize a change in optical path with the movement of the voice coil motor 4 along the optical axis, thereby realizing the basic function of the delay line. The hollow retroreflector 3 is of an existing structure, and the hollow retroreflector 3 is composed of three mirrors, so that parallel output of light beams incident at any incident angle can be guaranteed. In the embodiment, the diameter is 38.1mm, and the large caliber can ensure that the light source emitting module 1 and the light source receiving module 2 cannot interfere with each other; bare gold on the surface of the reflector is selected to improve the reflectivity; the beam shift is dependent on the manufacturing process of the product, the smaller the shift amount is better, and the beam shift amount of the hollow retroreflector 3 selected in this embodiment is 5 arcseconds.
Further, as a preferred embodiment, a plurality of second fixing hole locations are disposed on both the light source emitting module 1 and the light source receiving module 2. The second fixing hole position is arranged to realize the adjustable length of the optical path in the delay line; in other embodiments, the light source emitting module 1 and the light source receiving module 2 may be respectively fixed on a manual translation stage, and then the translation stage is fixed on the bottom plate 5, so as to achieve the adjustable optical path length, thereby achieving the adjustable optical path length inside the delay line, and rapidly completing the optical path matching of the transmitting and receiving optical paths in the all-fiber terahertz time-domain spectroscopy system.
Further, as a preferred implementation mode, the device further comprises an observation card, and the observation card is arranged on the output optical path.
In this embodiment, in order to ensure low insertion loss and stable output of the delay line, the positions and angles of the optical elements in the delay line are required to be adjusted. For the light source emitting module 1, if the output of the fiber laser is regarded as a light source, firstly, the position of the light source needs to be adjusted to be positioned at the focus of the aspheric collimating lens; secondly, the position of the aspheric collimating lens is adjusted so that the main surface of the aspheric collimating lens is perpendicular to the optical axis. Judging whether the position of the aspheric collimating lens, namely the light source, is debugged to the optimal position, an observation card with scale marks needs to be placed behind the light source and the collimator, and the position of the observation card is moved back and forth along the optical axis until the position and the size of light spots on the observation card do not change any more, which indicates that the light is output in parallel. Since the light source is 1550nm, a color rendering card in the wavelength band is required to be used as an observation card.
In this embodiment, the position of the hollow retroreflector 3 is fixed because the voice coil motor 4 and the position of the hollow retroreflector 3 are fixed, so the position of the hollow retroreflector 3 is not adjustable, but it is necessary to ensure that parallel light propagates to a specific position of the hollow retroreflector 3 to ensure high parallel output of the input light and the output light reflected by the hollow retroreflector 3, and in order to ensure accuracy of the above steps, it is necessary to place the observation card on an output light path of the hollow retroreflector 3, then adjust a position of the light source emission module 1 in a plane perpendicular to the optical axis (if the optical axis is regarded as a z axis, the plane perpendicular to the optical axis is a plane in x and y directions of the light source emission module 1), move the position of the observation card back and forth along the optical axis, and the size and the position of the light spot do not change, which indicates that the relative position of the light source emission module 1 and the hollow retroreflector 3 is completely adjusted at this time.
The light reflected by the hollow retroreflector 3 is coupled into the output optical fiber by the light source receiving module 2. And connecting the output optical fiber to an optical power meter, and debugging the position and the pitch angle of an aspheric collimating lens in the light source receiving module 2 to enable the output optical power to be maximum, wherein the debugging of the optical path of the delay line is finished when the voice coil motor 4 is static. And moving the voice coil motor 4 in a full stroke, observing whether the reading change of the optical power meter is stable, and debugging the light source receiving module 2 again if the reading change of the optical power meter is unstable.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope and embodiments of the present invention, and it should be appreciated by those skilled in the art that various equivalent and obvious modifications can be made in the present invention and the description and drawings, and all such modifications are intended to be included within the scope and spirit of the present invention.
Claims (7)
1. The optical path system of the rapid scanning device is characterized by comprising a bottom plate, a voice coil motor, a hollow retroreflector, a light source emitting module and a light source receiving module, wherein the voice coil motor, the hollow retroreflector, the light source emitting module and the light source receiving module are arranged on the bottom plate, the voice coil motor is connected with the hollow retroreflector and used for driving the hollow retroreflector to move along the direction of an optical axis, the light source emitting module is arranged on an input optical path of the hollow retroreflector, the light source receiving module is arranged on an output optical path of the hollow retroreflector, and the light source receiving module is located between the light source emitting module and the hollow retroreflector.
2. The optical path system of the fast scanning apparatus as claimed in claim 1, wherein the bottom plate has a plurality of first fixing holes for mounting the voice coil motor, the hollow retro-reflector, the light source emitting module and the light source receiving module.
3. The optical path system of a rapid scanning device according to claim 1, further comprising an observation card disposed on the output optical path.
4. The optical path system of the fast scanning apparatus as claimed in claim 1, wherein an aspheric collimating lens and a five-dimensional adjusting bracket for adjusting the position of the aspheric collimating lens are disposed inside the light source emitting module and inside the light source receiving module.
5. The optical path system of the fast scanning device as claimed in claim 4, wherein the focal length of said aspheric collimating lens is 18.4mm, and the clear aperture on said aspheric collimating lens is 5.5mm.
6. The optical path system of a rapid scanning device according to claim 1, wherein the diameter of said hollow retroreflector is 38.1mm.
7. The optical path system of the fast scanning apparatus as claimed in claim 1, wherein the light source emitting module and the light source receiving module are respectively provided with a plurality of second fixing holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221679303.7U CN217689613U (en) | 2022-07-01 | 2022-07-01 | Optical path system of rapid scanning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221679303.7U CN217689613U (en) | 2022-07-01 | 2022-07-01 | Optical path system of rapid scanning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217689613U true CN217689613U (en) | 2022-10-28 |
Family
ID=83714252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221679303.7U Active CN217689613U (en) | 2022-07-01 | 2022-07-01 | Optical path system of rapid scanning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217689613U (en) |
-
2022
- 2022-07-01 CN CN202221679303.7U patent/CN217689613U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110632713B (en) | Device and method for rapidly coupling large-divergence-angle laser to single-mode fiber | |
| US7254296B2 (en) | Apparatus for improved fiber optic coupling efficiency | |
| CA1109142A (en) | Passive optical range simulator device | |
| CN204044360U (en) | A kind of scanning type laser distance measuring equipment with light splitting piece | |
| CN110471147A (en) | The device and method of big angle of divergence laser coupled single mode optical fiber | |
| CN100529816C (en) | Focusing fiber optic | |
| CN113267856A (en) | Transmitting-receiving coaxial compact laser transmitting-receiving device | |
| CN205004613U (en) | Brief four ways holmium laser | |
| CN217689613U (en) | Optical path system of rapid scanning device | |
| CN117825003A (en) | Transmittance testing device based on transfer function instrument system | |
| CN113376766A (en) | Light path beam combining and optical fiber coupling device of space light laser | |
| JP2739632B2 (en) | Optical switching device | |
| CN108181688A (en) | For transceiver optoelectronic device receiver to Barebone and its application | |
| CN112612065A (en) | Coaxial optical fiber sensor | |
| CN219657907U (en) | Signal transmission device adopting collimation light path | |
| CN115267985B (en) | Lens coupling collimation system and method | |
| CN215067422U (en) | Light spot method debugging equipment for collimator | |
| CN213122366U (en) | Large divergence angle laser coupling single mode fiber device | |
| CN210412959U (en) | Laser soldering optical lens | |
| CN213729926U (en) | Laser energy attenuation device | |
| CN207742382U (en) | Receiver for transceiver optoelectronic device is to Barebone | |
| CN109406411B (en) | Light source device | |
| CN219737839U (en) | Low-power mid-infrared laser optical fiber space coupling device | |
| JP4247954B2 (en) | Assembly method of chromatic dispersion compensator | |
| CN219641976U (en) | Optical fiber coupling debugging structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |