CN209747893U - Frequency-sweeping laser - Google Patents
Frequency-sweeping laser Download PDFInfo
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- CN209747893U CN209747893U CN201920631759.8U CN201920631759U CN209747893U CN 209747893 U CN209747893 U CN 209747893U CN 201920631759 U CN201920631759 U CN 201920631759U CN 209747893 U CN209747893 U CN 209747893U
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- laser beam
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- collimating lens
- scanning device
- selective reflector
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Abstract
The utility model relates to a frequency-sweeping laser, which comprises a semi-transparent semi-reflecting film and a light amplification loop; the optical amplification loop comprises a gain chip, a collimating lens, a scanning device and a wavelength selective reflector; an initial laser beam with a preset wavelength is gained by a gain chip and then transmitted to a collimating lens; the laser beam corrected by the collimating lens is transmitted to the wavelength selective reflector through refraction of the scanning device; the wavelength selective reflector reflects the laser beam with preset wavelength to the scanning device, and the laser beam is refracted by the scanning device and transmitted to the semi-transparent semi-reflective film through the collimating lens so as to finish primary light amplification; the semi-transparent semi-reflective film reflects part of the received laser beam back to a gain chip of the light amplification loop for multiple times to realize multiple times of light amplification; the semi-transparent semi-reflecting film is also used for outputting the laser beam after multiple times of amplification.
Description
Technical Field
The utility model belongs to the optics field, in particular to sweep frequency laser.
Background
Optical Coherence Tomography (OCT), as a high-resolution, non-destructive, non-invasive Optical three-dimensional imaging technique, can not only meet the imaging requirements of medical fields such as ophthalmology, gastroenterology, cardiology, etc. on three-dimensional structures of biological tissues, but also meet the detection requirements of industrial fields such as lens pitch, printed circuit board, drug overcoats, semiconductor wafers, Optical film thickness, etc.
In the prior art, a Fourier domain mode-lock (FDML) fiber laser is used as a light source of the OCT, and has the advantages of high wavelength scanning speed, narrow instantaneous spectral linewidth, high output power and the like.
However, the inventors have studied that the cost of prior art FDML fiber lasers is too high.
The above-described background art is merely technical information which the inventors have possessed for deriving the embodiments of the present invention or learned in deriving the same, and is not necessarily a known art which has been disclosed to the general public before the filing of the present embodiments.
SUMMERY OF THE UTILITY MODEL
for the cost of effectual reduction frequency sweep laser, the utility model provides a frequency sweep laser includes:
In an aspect of an embodiment of the present invention, a frequency-swept laser is provided, including a transflective film and a light amplification circuit; the optical amplification loop comprises a gain chip, a collimating lens, a scanning device and a wavelength selective reflector;
The reflecting surface of the wavelength selective reflector is provided with a step-shaped structure matched with a preset wavelength or an inclined surface structure matched with the preset wavelength, and the wavelength selective reflector is used for selectively reflecting the laser beam with the preset wavelength;
An initial laser beam with a preset wavelength is gained by the gain chip in the optical amplification loop and then transmitted to the collimating lens; the laser beam corrected by the collimating lens is transmitted to the wavelength selective reflector through refraction of the scanning device; the wavelength selective reflector reflects the laser beam with the preset wavelength to the scanning device, and the laser beam is refracted by the scanning device and transmitted to the semi-transparent semi-reflective film through the collimating lens so as to finish primary light amplification;
The semi-transparent semi-reflective film reflects part of the received laser beam back to the gain chip of the optical amplification circuit for multiple times to realize multiple times of optical amplification; the semi-transparent semi-reflective film is also used for outputting the laser beam after multiple times of amplification.
Preferably, in an embodiment of the present invention, an antireflection film is further disposed between the semi-transparent and semi-reflective film and the collimating lens.
preferably, in an embodiment of the present invention, the step-like structure includes a coating film disposed in a step-like manner.
preferably, in an embodiment of the present invention, the step-like structure includes a step-like etching surface layer.
Preferably, in an embodiment of the present invention, the slope structure is formed by gravitational liquid solidification.
The embodiment of the utility model provides an on the other hand still provides a sweep frequency laser realization method, including the step:
S11, transmitting the initial laser beam with the preset wavelength after gain to a collimating lens by a gain chip of the optical amplification loop; the optical amplification loop comprises a gain chip, a collimating lens, a scanning device and a wavelength selective reflector;
s12, transmitting the laser beam corrected by the collimating lens to the wavelength selective reflector through refraction of the scanning device; the reflecting surface of the wavelength selective reflector is provided with a step-shaped structure matched with a preset wavelength or an inclined surface structure matched with the preset wavelength, and the wavelength selective reflector is used for selectively reflecting the laser beam with the preset wavelength;
s13, after the laser beam with the preset wavelength is reflected to the scanning device by the wavelength selective reflector, the laser beam is refracted by the scanning device and transmitted to the semi-transparent and semi-reflective film through the collimating lens, so that primary light amplification is completed;
S14, the semi-transparent semi-reflective film reflects part of the received laser beam back to the gain chip of the optical amplification circuit for multiple times to realize multiple times of optical amplification; the semi-transparent semi-reflective film is also used for outputting the laser beam after multiple times of amplification.
Preferably, in an embodiment of the present invention, an antireflection film is further disposed between the semi-transparent and semi-reflective film and the collimating lens.
Preferably, in an embodiment of the present invention, the step-like structure includes a coating film disposed in a step-like manner.
Preferably, in an embodiment of the present invention, the step-like structure includes a step-like etching surface layer.
preferably, in an embodiment of the present invention, the slope structure is formed by gravitational liquid solidification.
It can be seen from the above that, in the embodiment of the present invention, the initial laser beam with the preset wavelength is transmitted to the collimating lens after being gained by the gain chip; the laser beam corrected by the collimating lens is transmitted to the wavelength selective reflector through refraction of the scanning device; the wavelength selective reflector reflects the laser beam with preset wavelength to the scanning device, and the laser beam is refracted by the scanning device and transmitted to the semi-transparent semi-reflective film through the collimating lens so as to finish primary light amplification; the embodiment of the invention is also provided with the semi-transparent and semi-reflective film, so that the semi-transparent and semi-reflective film can realize multiple times of optical amplification by reflecting part of the received laser beam back to the gain chip in the optical amplification loop for multiple times; and finally, outputting the laser beam after multiple times of amplification through the semi-transparent semi-reflective film. Compared with the Fourier domain mode-locked fiber laser in the prior art, the embodiment of the invention adopts completely different laser beam amplification methods, simplifies the integral structure of the laser, and thus can effectively reduce the overall cost of the frequency-swept laser.
the technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
fig. 1 is a schematic structural diagram of a swept-frequency laser according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wavelength selective mirror according to an embodiment of the present invention;
FIG. 3 is a schematic view of another structure of a wavelength selective reflector according to an embodiment of the present invention
Fig. 4 is a schematic step diagram of a method for implementing a swept-frequency laser according to an embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that 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 belong to the protection scope of the present invention. Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
the word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, means, elements well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
The embodiment of the utility model provides a Fourier domain mode locking fiber laser is shown in figure 1, provides a sweep frequency laser, including semi-transparent semi-reflecting film 02 and light amplification loop; the optical amplification circuit comprises a quasi-gain chip 01, a straight lens 03, a scanning device 04 and a wavelength selective reflector 05;
The reflecting surface of the wavelength selective reflector 05 is provided with a step-shaped structure adapted to the preset wavelength or an inclined surface structure adapted to the preset wavelength, and the wavelength selective reflector 05 is used for selectively reflecting the laser beam with the preset wavelength;
the initial laser beam with the preset wavelength is gained by the gain chip 01 in the optical amplification loop and then transmitted to the collimating lens 03; the laser beam corrected by the collimating lens 03 is transmitted to the wavelength selective mirror 05 by refraction of the scanning device 04; the wavelength selective reflector 05 reflects a laser beam with a preset wavelength to the scanning device 04, and then the laser beam is refracted by the scanning device 04 and transmitted to the semi-transparent and semi-reflective film 02 through the collimating lens 03, so that primary light amplification is completed;
The semi-transparent semi-reflective film 02 reflects part of the received laser beam back to the gain chip 01 of the optical amplification loop for multiple times to realize multiple times of optical amplification; the transflective film 02 is also used for outputting the laser beam after multiple times of amplification.
the embodiment of the utility model provides an in, accomplish the light amplification back each time through the light amplification return circuit, the laser beam all can transmit to semi-transparent semi-reflecting membrane 02, then semi-transparent semi-reflecting membrane 02 reflects partial laser beam back to the gain chip 01 of light amplification return circuit again, and this part laser beam will accomplish next light amplification in the light amplification return circuit, and the laser beam is after the enlargies of process (predetermineeing the number of times), can realize the output of laser beam through semi-transparent semi-reflecting membrane 02.
In practical application, the embodiment of the present invention may further include an anti-reflection film 06 between the semi-transparent and semi-reflective film 02 and the collimating lens 03, so as to increase the intensity of transmitted light.
The embodiment of the present invention provides a wavelength selective reflector 05, the microstructure of its reflecting surface can be as shown in fig. 2, for the echelonment structure, in practical application, can realize through the coating film that is the echelonment setting (i.e., echelonment coating film), or, through the sculpture of the different degree of depth, form the etching top layer that is the echelonment at the reflecting surface.
In addition, the microstructure of the reflecting surface of the wavelength selective reflector 05 in the embodiment of the present invention may be a slope structure as shown in fig. 3, and the slope structure is formed by the gravity liquid solidification.
Referring to fig. 1 and 4, in another aspect of the embodiment of the present invention, there is further provided a swept-frequency laser implementation method, including the steps of:
S11, transmitting the initial laser beam with the preset wavelength after gain to the collimating lens 03 by the gain chip 01 of the optical amplification loop; the optical amplification loop comprises a gain chip 01, a collimating lens 03, a scanning device 04 and a wavelength selective reflector 05;
S12, transmitting the laser beam corrected by the collimating lens 03 to the wavelength selective mirror 05 by refraction of the scanning device 04; the reflecting surface of the wavelength selective reflector 05 is provided with a step-shaped structure adapted to the preset wavelength or an inclined surface structure adapted to the preset wavelength, and the wavelength selective reflector 05 is used for selectively reflecting the laser beam with the preset wavelength;
S13, after the wavelength selective mirror 05 reflects the laser beam with the preset wavelength to the scanning device 04, the laser beam is refracted by the scanning device 04 and transmitted to the transflective film 02 through the collimating lens 03, thereby completing primary light amplification;
S14, the semi-transparent and semi-reflective film 02 reflects part of the received laser beam back to the gain chip 01 of the optical amplification circuit for multiple times to realize multiple times of optical amplification; the semi-transparent semi-reflecting film is also used for outputting the laser beam after multiple times of amplification.
The embodiment of the utility model provides an in, accomplish the light amplification back each time through the light amplification return circuit, the laser beam all can transmit to semi-transparent semi-reflecting membrane 02, then semi-transparent semi-reflecting membrane 02 reflects partial laser beam back to the gain chip 01 of light amplification return circuit again, and this part laser beam will accomplish next light amplification in the light amplification return circuit, and the laser beam is after the enlargies of process (predetermineeing the number of times), can realize the output of laser beam through semi-transparent semi-reflecting membrane 02.
In practical application, in the embodiment of the present invention, an antireflection film 06 may be further disposed between the semi-transparent and semi-reflective film 02 and the collimating lens 03, so as to increase the intensity of transmitted light.
The embodiment of the present invention provides a wavelength selective reflector 05, the microstructure of its reflecting surface can be as shown in fig. 2, for the echelonment structure, in practical application, can realize through the coating film that is the echelonment setting (i.e., echelonment coating film), or, through the sculpture of the different degree of depth, form the etching top layer that is the echelonment at the reflecting surface.
in addition, the microstructure of the reflecting surface of the wavelength selective reflector 05 in the embodiment of the present invention may be a slope structure as shown in fig. 3, and the slope structure is formed by the gravity liquid solidification.
it can be seen from the above that, in the embodiment of the present invention, the initial laser beam with the preset wavelength is transmitted to the collimating lens after being gained by the gain chip; the laser beam corrected by the collimating lens is transmitted to the wavelength selective reflector through refraction of the scanning device; the wavelength selective reflector reflects the laser beam with preset wavelength to the scanning device, and the laser beam is refracted by the scanning device and transmitted to the semi-transparent semi-reflective film through the collimating lens so as to finish primary light amplification; the embodiment of the utility model is also provided with a semi-transparent and semi-reflective film, so that the semi-transparent and semi-reflective film can realize multiple light amplification by reflecting part of the received laser beam back to the light amplification loop for multiple times; and finally, outputting the laser beams amplified for multiple times by the semi-transparent semi-reflective film. Compare in the mode locking fiber laser of Fourier domain among the prior art, the embodiment of the utility model provides an adopted the laser beam amplification method of complete difference, simplified the overall structure of sweep frequency laser to can effectually reduce the overall cost of sweep frequency laser.
Those of ordinary skill in the art will understand that: spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The article may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
In this document, the terms "first", "second", etc. are used to distinguish two different elements or portions, and are not used to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. a frequency-swept laser is characterized by comprising a semi-transparent semi-reflective film and an optical amplification loop; the optical amplification loop comprises a gain chip, a collimating lens, a scanning device and a wavelength selective reflector;
The reflecting surface of the wavelength selective reflector is provided with a step-shaped structure matched with a preset wavelength or an inclined surface structure matched with the preset wavelength, and the wavelength selective reflector is used for selectively reflecting the laser beam with the preset wavelength;
An initial laser beam with a preset wavelength is gained by the gain chip in the optical amplification loop and then transmitted to the collimating lens; the laser beam corrected by the collimating lens is transmitted to the wavelength selective reflector through refraction of the scanning device; the wavelength selective reflector reflects the laser beam with the preset wavelength to the scanning device, and the laser beam is refracted by the scanning device and transmitted to the semi-transparent semi-reflective film through the collimating lens so as to finish primary light amplification;
the semi-transparent semi-reflective film reflects part of the received laser beam back to the gain chip of the optical amplification circuit for multiple times to realize multiple times of optical amplification; the semi-transparent semi-reflective film is also used for outputting the laser beam after multiple times of amplification.
2. The swept-frequency laser device of claim 1, wherein an antireflection film is further disposed between the transflective film and the collimating lens.
3. The swept-frequency laser of claim 1, wherein the stepped structure comprises a coating disposed in a step.
4. The swept-frequency laser of claim 1, wherein the stepped structure comprises a stepped etched surface layer.
5. The swept-frequency laser of claim 1, wherein the slope structure is formed by gravitational liquid solidification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920631759.8U CN209747893U (en) | 2019-05-06 | 2019-05-06 | Frequency-sweeping laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920631759.8U CN209747893U (en) | 2019-05-06 | 2019-05-06 | Frequency-sweeping laser |
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| Publication Number | Publication Date |
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| CN209747893U true CN209747893U (en) | 2019-12-06 |
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| CN201920631759.8U Withdrawn - After Issue CN209747893U (en) | 2019-05-06 | 2019-05-06 | Frequency-sweeping laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165533A (en) * | 2019-05-06 | 2019-08-23 | 北京图湃影像科技有限公司 | A kind of frequency swept laser and its implementation |
-
2019
- 2019-05-06 CN CN201920631759.8U patent/CN209747893U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165533A (en) * | 2019-05-06 | 2019-08-23 | 北京图湃影像科技有限公司 | A kind of frequency swept laser and its implementation |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20191206 Effective date of abandoning: 20210223 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20191206 Effective date of abandoning: 20210223 |