CN111180986A - Distributed feedback laser based on holographic polymer dispersed liquid crystal - Google Patents
Distributed feedback laser based on holographic polymer dispersed liquid crystal Download PDFInfo
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- CN111180986A CN111180986A CN202010020861.1A CN202010020861A CN111180986A CN 111180986 A CN111180986 A CN 111180986A CN 202010020861 A CN202010020861 A CN 202010020861A CN 111180986 A CN111180986 A CN 111180986A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/20—Liquids
- H01S3/213—Liquids including an organic dye
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08086—Multiple-wavelength emission
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Abstract
The invention discloses a distributed feedback laser based on holographic polymer dispersed liquid crystal, which comprises a first glass substrate, a second glass substrate and a grating layer, wherein the first glass substrate is a glass substrate; the grating layer is arranged between the first glass substrate and the second glass substrate, and the inner sides of the first glass substrate and the second glass substrate are respectively plated with indium tin oxide films; the grating layer is a holographic polymer dispersed liquid crystal variable-pitch grating. The holographic polymer dispersed liquid crystal variable-pitch grating is arranged between a first glass substrate and a second glass substrate, the wavelength of an emergent laser is continuously adjustable through a continuously-changed liquid crystal polymer periodic structure in the variable-pitch grating, and the tuning range depends on the change range of the grating period; particularly, alternating current is loaded on two glass substrates, and the intensity of emergent laser can be electrically tuned, so that the laser wavelength of the laser based on the distributed feedback type of the holographic polymer dispersed liquid crystal can be continuously adjustable in a large range.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a distributed feedback laser based on holographic polymer dispersed liquid crystal.
Background
The distributed feedback laser adopts a structure with periodically changed refractive index to realize the feedback function of the resonant cavity. The laser not only improves the performances of the semiconductor laser such as mode, temperature coefficient and the like, but also is convenient to couple and integrate with other elements in an integrated optical circuit because the laser adopts a planar process. The holographic polymer dispersed liquid crystal grating has a structure with a periodically-changed refractive index, and the prepared optical path is simple and easy to operate, so that the holographic polymer dispersed liquid crystal grating is used as a resonant cavity of a distributed feedback laser. The laser dye can obtain a wider fluorescence spectrum from visible light, and the small-molecule laser dye can be directly doped into the polymer dispersed liquid crystal material, so that the dye-doped laser based on the holographic polymer dispersed liquid crystal grating can obtain a wider range of emitted laser. And the periodic structure of the polymer dispersed liquid crystal grating can be adjusted under the external alternating voltage, so that the dye and the liquid crystal polymer grating are organically combined to form a novel liquid crystal polymer dye tunable laser.
However, the energy conversion efficiency of the dye-doped laser is very low, the polarization state of the emitted laser is not linear polarization, and the laser comes out from the side surface of the grating film, so that the shape of the final emitted light spot cannot be well controlled and the divergence angle is very large, therefore, researchers adopt organic semiconductor materials to replace dyes as the gain materials of the laser, and the performance of the laser is improved. But the exit laser wavelength cannot be continuously tuned over a wide range.
Disclosure of Invention
In order to solve the problems, the invention provides a distributed feedback laser based on holographic polymer dispersed liquid crystal.
To achieve the object of the present invention, there is provided a distributed feedback laser based on holographic polymer dispersed liquid crystal, comprising: the device comprises a first glass substrate, a second glass substrate and a grating layer;
the grating layer is arranged between the first glass substrate and the second glass substrate, and indium tin oxide films are respectively plated on the inner sides of the first glass substrate and the second glass substrate; the grating layer is a holographic polymer dispersed liquid crystal variable-pitch grating.
In one embodiment, a layer of organic semiconductor material MEH-PPV is uniformly spin-coated on the indium tin oxide film of the first glass substrate or the indium tin oxide film of the second glass substrate.
In one embodiment, the first and second glass substrates are parallel to each other.
As an example, when the pumping energy of the incident light is higher than the threshold operating energy of the laser, the direction of the emitted laser light is perpendicular to the first glass substrate or the second glass substrate.
In one embodiment, the grating layer includes a beam splitting prism for producing a variable pitch grating.
As an embodiment, the preparation process of the grating layer includes:
the method comprises the steps that a beam of plane wave and a beam of cylindrical wave are subjected to interference exposure to form expanded laser, the expanded laser is divided into two beams of laser with equal energy through a beam splitter prism, and one beam of laser passes through a cylindrical lens and then interferes with the other beam of laser on an exposure surface to form the holographic polymer dispersed liquid crystal variable-pitch grating with a continuously-changing periodic structure.
According to the distributed feedback laser based on the holographic polymer dispersed liquid crystal, the holographic polymer dispersed liquid crystal variable-pitch grating is arranged between the first glass substrate and the second glass substrate, the outgoing laser wavelength is continuously adjustable through the continuously-changed liquid crystal polymer periodic structure in the variable-pitch grating, and the tuning range depends on the variation range of the grating period; particularly, alternating current is loaded on two glass substrates (a first glass substrate and a second glass substrate), and the intensity of emergent laser can be electrically tuned, so that the laser wavelength of the laser based on the distributed feedback of the holographic polymer dispersed liquid crystal can be continuously adjustable in a large range.
Drawings
FIG. 1 is a schematic diagram of a holographic polymer dispersed liquid crystal based distributed feedback laser structure according to one embodiment;
FIG. 2 is a schematic diagram of a distributed feedback laser structure based on holographic polymer dispersed liquid crystal according to another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a distributed feedback laser based on a holographic polymer dispersed liquid crystal according to an embodiment, and includes a first glass substrate 11, a second glass substrate 12, and a grating layer 13;
the grating layer 12 is arranged between the first glass substrate 11 and the second glass substrate 12, and indium tin oxide films are respectively plated on the inner sides of the first glass substrate 11 and the second glass substrate 12; the grating layer 13 is a holographic polymer dispersed liquid crystal variable-pitch grating.
The first glass substrate 11 and the second glass substrate 12 may be the same glass substrate, a layer of grating is sandwiched between the two glass substrates, and indium tin oxide films are plated on the inner sides of the two glass substrates; uniformly spin-coating a layer of organic semiconductor material MEH-PPV on one glass substrate plated with indium tin oxide; the grating layer is a holographic polymer dispersed liquid crystal variable-pitch grating. Pulse frequency doubling Nd-YAG laser is used to irradiate the laser at a certain angle, and when the pumping energy is higher than the threshold working energy of the laser, the laser emits laser perpendicular to the surface of the glass substrate.
According to the distributed feedback laser based on the holographic polymer dispersed liquid crystal, the holographic polymer dispersed liquid crystal variable-pitch grating is arranged between the first glass substrate 11 and the second glass substrate 12, the outgoing laser wavelength is continuously adjustable through the continuously-changed liquid crystal polymer periodic structure in the variable-pitch grating, and the tuning range depends on the change range of the grating period; particularly, alternating current is loaded on two glass substrates (a first glass substrate 11 and a second glass substrate 12), and the intensity of the emergent laser can be electrically tuned, so that the laser wavelength of the laser based on the distributed feedback type laser of the holographic polymer dispersed liquid crystal can be continuously adjustable in a large range.
In one embodiment, a layer of organic semiconductor material MEH-PPV is uniformly spin-coated on the indium tin oxide film of the first glass substrate or the indium tin oxide film of the second glass substrate.
Specifically, the MEH-PPV film cannot be completely spin-coated on the corresponding glass substrate (the first glass substrate or the second glass substrate), and a certain area needs to be left below for applying an ac voltage to the laser.
In one embodiment, the first and second glass substrates are parallel to each other.
As an embodiment, when the pumping energy of the excitation light is higher than the threshold operating energy of the laser, the direction of the emitted laser light is perpendicular to the first glass substrate or the second glass substrate.
In one embodiment, the grating layer includes a beam splitting prism for producing a variable pitch grating.
As an embodiment, the preparation process of the grating layer includes:
the method comprises the steps that a beam of plane wave and a beam of cylindrical wave are subjected to interference exposure to form expanded laser, the expanded laser is divided into two beams of laser with equal energy through a beam splitter prism, and one beam of laser passes through a cylindrical lens and then interferes with the other beam of laser on an exposure surface to form the holographic polymer dispersed liquid crystal variable-pitch grating with a continuously-changing periodic structure.
Specifically, the holographic polymer dispersed liquid crystal variable-pitch grating can be formed by adopting interference exposure of a plane wave and a cylindrical wave, the expanded laser is divided into two beams of laser with equal energy through a beam splitter prism, and one beam of laser is interfered with the other beam of laser on an exposure surface after passing through a cylindrical lens to form the variable-pitch grating with a continuously-changing periodic structure. The period of the holographic variable pitch grating can be varied by using cylindrical lenses of different focal lengths. The cylindrical lens is used for preparing the variable-pitch grating, so that the distributed feedback laser based on the holographic polymer dispersed liquid crystal can realize that the continuous gradual change of the laser emergent wavelength depends on the variable-pitch grating. The cylindrical lenses with different focal lengths are used for manufacturing the variable-pitch grating with different period change ranges by replacing the cylindrical lenses, for example, the period range of some variable-pitch gratings is 400nm-800nm, and some variable-pitch gratings are 800nm-1000 nm.
In one embodiment, the first glass substrate and the second glass substrate are the same glass substrate and may be represented by the same reference numerals, and the indium tin oxide thin films respectively coated on the inner sides of the first glass substrate and the second glass substrate are also the same thin films and may be represented by the same reference numerals, in this case, the distributed feedback laser based on the holographic polymer dispersed liquid crystal may be referred to as shown in fig. 2. In fig. 2, 1 is a glass substrate, 2 is an ito film, 3 is an MEH-PPV film, 4 is a spacer, 5 is a polymer, 6 is a liquid crystal, 7 is a pump light, and 8 is an emission light.
Specifically, the preparation process of the distributed feedback laser based on the holographic polymer dispersed liquid crystal can comprise the following steps:
(1) two glass sheets with dimensions of 4 cm x 2 cm were selected, with a thickness of 1 mm. One side of the two glass substrates is plated with an indium tin oxide film with the thickness of 20 nanometers.
(2) Dissolving the orange red fibrous MEH-PPV material in a xylene solution at a certain concentration, selecting any one of the glass substrates, and uniformly spin-coating an MEH-PPV film with the thickness of 85 nanometers on the glass substrate by using a spin coater. The edge of the glass substrate is left free from spin coating during the spin coating process to ensure that an applied ac voltage can be applied to the laser.
(3) The exposure light path is built, laser emitted by a laser with the wavelength of 532 nanometers is divided into two beams of laser after passing through a beam expanding prism and an equal-energy beam splitting prism, the propagation direction of the laser is changed by two reflectors, one beam of laser passes through a cylindrical lens and is subjected to interference exposure on an exposure surface with the other beam of laser, the included angle of the central beams of the two beams of laser is 84.6 degrees, the focal length of the cylindrical lens is 20 centimeters, and the exposure surface is positioned at the position 40 centimeters behind the cylindrical lens.
(4) Dropping a drop of polymer dispersed liquid crystal material on a glass sheet plated with an MEH-PPV film, controlling the thickness of a grating by a spacer in the material, covering another glass sheet on the glass sheet in a staggered manner, and then placing the glass sheet on an exposure surface of the interference light field for exposure, wherein the laser energy on the exposure surface is 20mW/cm2The exposure time was 60 seconds.
(5) The laser device is characterized in that an Nd-YAG frequency doubling laser is adopted, the pulse width is 8 nanoseconds, the repetition frequency can be adjusted between 1 Hz and 10 Hz, the laser device which is exposed is obliquely incident at a certain angle, and when the pumping energy is higher than the threshold working energy of the laser device, the laser device emits laser light perpendicular to the surface of the glass substrate. When the frequency-doubled laser is incident to different positions, because the grating has a continuously-changing periodic lambda structure inside, the formula of the outgoing laser wavelength lambda of the distributed feedback laser is as follows:
wherein n iseffM is the order, which is the effective refractive index of the grating layer material.
(6) Alternating voltage is loaded on the two glass substrates, and when the voltage is gradually increased, the light intensity of the emergent laser is gradually reduced due to the modulation effect of the alternating current received by the liquid crystal.
Compared with the prior art, the distributed feedback laser based on the holographic polymer dispersed liquid crystal has the beneficial effects that: because the outgoing laser wavelength of the distributed feedback laser has close relation with the grating period, the outgoing laser wavelength is continuously adjustable through the liquid crystal polymer periodic structure with continuous change in the variable-pitch grating, and the tuning range depends on the change range of the grating period; alternating current is loaded on the two glass substrates, and the intensity of the emitted laser can be electrically tuned.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application merely distinguish similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence when allowed. It should be understood that "first \ second \ third" distinct objects may be interchanged under appropriate circumstances such that the embodiments of the application described herein may be implemented in an order other than those illustrated or described herein.
The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, product, or device.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A distributed feedback laser based on holographic polymer dispersed liquid crystal is characterized by comprising a first glass substrate, a second glass substrate and a grating layer;
the grating layer is arranged between the first glass substrate and the second glass substrate, and indium tin oxide films are respectively plated on the inner sides of the first glass substrate and the second glass substrate; the grating layer is a holographic polymer dispersed liquid crystal variable-pitch grating.
2. The holographic polymer dispersed liquid crystal based distributed feedback laser of claim 1, wherein the indium tin oxide film of the first glass substrate or the indium tin oxide film of the second glass substrate is uniformly spin coated with a layer of organic semiconductor material MEH-PPV.
3. The holographic polymer dispersed liquid crystal based distributed feedback laser of claim 1, wherein the first glass substrate and the second glass substrate are parallel to each other.
4. The holographic polymer dispersed liquid crystal based distributed feedback laser of claim 3, wherein the direction of the emitted laser light is perpendicular to the first glass substrate or the second glass substrate when the pumping energy of the incident light is higher than the laser threshold operating energy.
5. The holographic polymer dispersed liquid crystal based distributed feedback laser of any of claims 1 to 4, wherein the grating layer comprises a beam splitter prism, and the beam splitter prism is used for preparing a variable pitch grating.
6. The holographic polymer dispersed liquid crystal based distributed feedback laser of claim 5, wherein the grating layer is prepared by a process comprising:
the method comprises the steps that a beam of plane wave and a beam of cylindrical wave are subjected to interference exposure to form expanded laser, the expanded laser is divided into two beams of laser with equal energy through a beam splitter prism, and one beam of laser passes through a cylindrical lens and then interferes with the other beam of laser on an exposure surface to form the holographic polymer dispersed liquid crystal variable-pitch grating with a continuously-changing periodic structure.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113625380A (en) * | 2021-05-27 | 2021-11-09 | 邓景月 | Grating preparation method and ARPDLC holographic polymer liquid crystal grating |
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