CN108242762B - Adjustable random laser chip based on two-sided PDMS fold - Google Patents
Adjustable random laser chip based on two-sided PDMS fold Download PDFInfo
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- CN108242762B CN108242762B CN201810189388.2A CN201810189388A CN108242762B CN 108242762 B CN108242762 B CN 108242762B CN 201810189388 A CN201810189388 A CN 201810189388A CN 108242762 B CN108242762 B CN 108242762B
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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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/307—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in a liquid
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Abstract
The invention relates to an adjustable random laser chip based on double-sided PDMS folds, belonging to the technical field of random laser chips; the technical problem to be solved is to provide an adjustable random laser chip which has low cost, simple preparation and convenient operation; the technical scheme for solving the technical problem is as follows: the gain medium solution is clamped between the first PDMS sheet and the second PDMS sheet and is contacted with the wrinkled surface of the first PDMS sheet and the second PDMS sheet; pumping the adjustable random laser chip by using the pump laser, moving one of the PDMS sheets along the direction vertical to the wrinkle, wherein the wrinkle period formed between the two PDMS sheets can be changed, and the wavelength of the emergent laser is changed; the invention can be widely applied to the field of random laser chips.
Description
Technical Field
The invention discloses an adjustable random laser chip based on double-sided PDMS folds, and belongs to the technical field of random laser chips.
Background
Conventional laser chips include a gain medium and a resonant cavity, where the resonant cavity is typically composed of two mirrors, capable of producing coherent feedback. While the random laser chip has no resonant cavity, its feedback mechanism may have two kinds: one is that light is partially reflected back into the medium by the interface of the random medium and air, thus forming a feedback; the other is that the beam forms a closed loop within the random medium, thereby acting as a feedback similar to a resonant cavity. For the conventional laser chip, scattering is avoided as much as possible in the experiment, but unlike the random laser chip, it uses multiple scattering of light waves by random medium to form laser. Therefore, the physical mechanisms of the two laser chips are completely different, so that the random laser chip has some unique light-emitting characteristics.
To date, various types of microcavities have been developed in conventional laser chips, and despite considerable efforts in optimizing microcavity design, the precise fabrication of soft lithography processes and the precise control of liquid flow rates remain highly challenging, adding significant complexity to both fabrication and operation. Recently, the fusion of optical fluids and random structures has provided a new approach to on-chip random laser source integration. Bhaktha et al demonstrate optofluidic random lasers based on the corrugation of serpentine Polydimethylsiloxane (PDMS) channels due to the limited precision of soft lithography, which greatly reduces the need for high-standard fabrication techniques. The surface of the stretched PDMS is treated by oxygen plasma, the stretched PDMS can form wrinkles on the surface after stress is released, and random laser is generated by the PDMS wrinkles. This further simplifies the preparation process and reduces the preparation cost.
The use of PDMS pleats to generate random laser light is a simple and effective method. The period of the fold has an important influence on the properties of the laser, such as the wavelength. A plurality of wrinkles with different periods need to be prepared in the experimental process by utilizing a chip prepared from a PDMS wrinkled sheet and a PDMS flat sheet; in the operation process, the replacement of the wrinkles in different periods can greatly increase external influence factors, and the experiment process becomes complicated. Therefore, a chip with adjustable fold period can be prepared, and the purpose of generating adjustable random laser is achieved.
Disclosure of Invention
The invention discloses an adjustable random laser chip based on double-sided PDMS folds, overcomes the defects in the prior art, and provides an adjustable random laser chip which is low in cost, simple to prepare and convenient to operate.
In order to solve the technical problems, the invention adopts the technical scheme that: a tunable random laser chip based on double-sided PDMS folds comprises a first PDMS sheet, a gain medium solution and a second PDMS sheet, wherein the lower surface of the first PDMS sheet is provided with a fold structure, the upper surface of the second PDMS sheet is provided with a fold structure, and the gain medium solution is clamped between the first PDMS sheet and the second PDMS sheet and is in contact with the fold surface of the first PDMS sheet and the second PDMS sheet; the pump laser pumps the adjustable random laser chip, one PDMS sheet is moved along the direction perpendicular to the wrinkle direction, the wrinkle period formed between the two PDMS sheets changes, and the wavelength of the emergent laser changes accordingly.
Further, the thickness of the PDMS sheet is 0.1 mm-2 mm.
Furthermore, the gain medium solution is a dye molecule solution or a quantum dot solution.
Compared with the prior art, the invention has the following beneficial effects.
1. Two PDMS sheets with folds are adopted, lasers with different wavelengths can be generated by changing the fold period, and the method has the characteristics of rapidness and simplicity in operation.
2. Only one of the PDMS sheets needs to be moved, lasers with different wavelengths can be generated, the chips do not need to be replaced, the operation process is simple, and the influence of external factors is small.
3. The problem that chips prepared by adopting one PDMS corrugated sheet and one PDMS flat sheet need to be prepared with different corrugation periods is solved, and the method has the characteristics of low cost and simplicity in preparation.
Drawings
Fig. 1 is a schematic sectional structure of the present invention.
In the figure, 1-the first PDMS sheet, 2-the gain medium solution, 3-the second PDMS sheet.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the tunable random laser chip based on double-sided PDMS wrinkles of the present invention includes a first PDMS sheet 1, a gain medium solution 2, and a second PDMS sheet 3. The lower surface of the first PDMS sheet 1 is provided with a corrugated structure, the upper surface of the second PDMS sheet 3 is provided with a corrugated structure, and the gain medium solution 2 is clamped between the first PDMS sheet 1 and the second PDMS sheet 3 and is contacted with the corrugated surface of the first PDMS sheet 1 and the second PDMS sheet 3; the pump laser pumps the adjustable random laser chip, when light formed by scattering of the light on the gain medium solution and the PDMS wrinkle surface is amplified enough to overcome loss, laser is generated, one PDMS sheet is moved along the direction perpendicular to the wrinkle, the wrinkle period formed between the two PDMS sheets changes, and the wavelength of the emergent laser changes accordingly.
Example 1
The first PDMS sheet 1 was 4cm in length, 4cm in width and 0.1mm in thickness. The lower surface of the first PDMS sheet 1 had a wrinkled structure with a wrinkle period of 2 μm. The gain medium solution 2 was a 1mM rhodamine 6G (R6G) ethylene glycol solution. The second PDMS sheet 3 was 4cm in length, 4cm in width and 2mm in thickness. The upper surface of the second PDMS sheet 3 has a wrinkled structure with a wrinkle period of 2 μm.
Example 2
The first PDMS sheet 1 was 3cm long, 3cm wide and 2mm thick. The lower surface of the first PDMS sheet 1 had a wrinkled structure with a wrinkle period of 1 μm. The gain medium solution 2 is a 2 μ M CdSe/ZnS quantum dot solution. The second PDMS sheet 3 was 3cm in length, 3cm in width, and 0.12mm in thickness. The upper surface of the second PDMS sheet 3 has a wrinkled structure with a wrinkle period of 3 μm.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (1)
1. The utility model provides an adjustable random laser chip based on two-sided PDMS fold which characterized in that: the device comprises a first PDMS sheet (1), a gain medium solution (2) and a second PDMS sheet (3), wherein the lower surface of the first PDMS sheet (1) is provided with a corrugated structure, the upper surface of the second PDMS sheet (3) is provided with a corrugated structure, and the gain medium solution (2) is clamped between the first PDMS sheet (1) and the second PDMS sheet (3) and is in contact with the corrugated surface of the first PDMS sheet (1) and the second PDMS sheet (3); the pump laser pumps the adjustable random laser chip, one of the PDMS sheets is moved along the direction perpendicular to the wrinkle direction, the wrinkle period formed between the two PDMS sheets changes, the wavelength of the emergent laser changes accordingly, the thickness of the two PDMS sheets (1, 3) is 0.1-0.12 mm or 2mm, and the gain medium solution (2) is quantum dot solution.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810189388.2A CN108242762B (en) | 2018-03-08 | 2018-03-08 | Adjustable random laser chip based on two-sided PDMS fold |
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| CN201810189388.2A CN108242762B (en) | 2018-03-08 | 2018-03-08 | Adjustable random laser chip based on two-sided PDMS fold |
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| Publication Number | Publication Date |
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| CN108242762A CN108242762A (en) | 2018-07-03 |
| CN108242762B true CN108242762B (en) | 2020-09-15 |
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| CN110077110B (en) * | 2019-05-14 | 2020-07-07 | 青岛科技大学 | Method for manufacturing random laser system by ink-jet printing |
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| KR20100027526A (en) * | 2008-09-02 | 2010-03-11 | 삼성전기주식회사 | Fabrication method of thin film device |
| CN102761058A (en) * | 2012-07-11 | 2012-10-31 | 东南大学 | Method used for adjusting and controlling outgoing wavelength of random laser through changing thickness |
| CN103789741B (en) * | 2014-02-20 | 2016-06-08 | 苏州华维纳纳米科技有限公司 | A kind of metal-surface nano structure preparation method based on fold |
| CN104518417A (en) * | 2015-01-20 | 2015-04-15 | 厦门大学 | Quantum dot random optical fiber laser device |
| CN106911067A (en) * | 2017-03-27 | 2017-06-30 | 合肥工业大学 | The method of On-line Control polymer optical fiber Random Laser launch wavelength |
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