A multi-color whispering gallery laser with nested cavity structure

Abstract

The present invention discloses a nested cavity structure multicolor whispering gallery laser, comprising a nested cavity structure and an organic semiconductor gain material. The nested cavity structure is composed of two hollow-core optical fibers with equal wall thickness and unequal inner diameters. The organic semiconductor gain material is injected into the nested cavity structure in a predetermined order. When pumped by external light, a multicolor whispering gallery laser can be obtained. This multicolor whispering gallery laser has the characteristics of a high quality factor and narrow linewidth. The structure also avoids fluorescence resonance energy transfer. By varying the type of polymer in the nested cavity, a wavelength-tunable laser can be realized. The present invention has the characteristics of a simple manufacturing method, high integration, wide color gamut coverage, and multicolor and wavelength tunability.

Description

Technical Field

[0001] The invention relates to a multi-color whispering gallery laser with a nested cavity structure, belonging to the field of optoelectronic technology. Background Art

[0002] The basic principle of the Whispering Gallery Mode (WGM) is that when electromagnetic waves propagate from a denser medium to a less dense medium, they undergo total internal reflection at the interface. Electromagnetic waves of a specific frequency are confined within the whispering gallery microcavity by total internal reflection at the cavity interface, increasing the confinement time and number of reflections of the electromagnetic waves and significantly increasing the interaction between light and matter. Whispering gallery lasers have the advantages of small mode volume, low threshold, and high quality factor, and have important application prospects in ultra-sensitive single nanoparticle detection, biosensors, and on-chip integrated devices. Full-color whispering gallery lasers also have important application prospects in multi-color displays and white light lasers.

[0003] In recent years, organic semiconductor gain materials have been favored by researchers due to their high quantum yield. Whispering gallery lasers have important application prospects in some new physical devices. Researchers have focused on reducing microcavity losses, improving the quality factor of whispering gallery lasers, detecting single nanoparticles, and miniaturizing whispering gallery lasers. In the practical application of lasers, full-color laser display, simplification, and high integration are also important considerations. Based on the above considerations, the present invention proposes a nested cavity structure multi-color whispering gallery laser with the advantages of simple structure, high integration, and a wide color gamut. Summary of the Invention

[0004] The present invention proposes a nested cavity structure multi-color whispering gallery laser, which is characterized by: comprising a pump source, an organic semiconductor material as a gain medium, and a hollow-core optical fiber with a whispering gallery microcavity structure; hollow-core optical fibers with equal wall thickness and different inner diameters are nested together to form a nested cavity structure, and the organic semiconductor gain material is injected into the nested cavity structure in a certain order; the pump source excites the organic semiconductor material.

[0005] The gain material is PFO (poly[9,9-dioctylfluorenyl-2,7-diyl]endcapped withdimethyl phthalate) and F8BT (poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-co-(1,4-benzo-(2,1',3)-thiadiazole)]) and MDMO-PPV (poly[2-methoxy-5-(3',7-dimethyloctyloxy)-1,4-phenylenevinylene]);

[0006] The nested cavity structure is composed of hollow-core fibers with the same wall thickness but different inner diameters. They are labeled as hollow-core fiber I and hollow-core fiber II.

[0007] The hollow core optical fiber is made of glass or quartz.

[0008] The hollow-core optical fiber I is a laser resonant cavity with a smaller inner diameter, emitting long-wavelength laser light; the hollow-core optical fiber II is a laser resonant cavity with a larger inner diameter, emitting short-wavelength laser light.

[0009] The present invention employs a nested resonant cavity structure. Organic semiconductor solutions are sequentially injected into the nested cavities, and the cavities are sealed with hydrogel to produce a nested multicolor whispering gallery laser. When excited by external pump light, the organic semiconductor solution absorbs the pump light energy, achieving population inversion. Within the whispering gallery resonant cavity, electromagnetic waves of a specific frequency undergo multiple total reflections within the cavity, significantly increasing light-matter interaction and enabling emission from the whispering gallery laser. By varying the type of gain dye within the nested cavity, different gain dyes are simultaneously excited by the pump light, resulting in single-color, dual-color, and full-color whispering gallery lasers.

[0010] The present invention has the following beneficial effects:

[0011] 1. A single nested cavity can realize a full-color whispering gallery laser, which is suitable for the development and application of highly integrated, miniaturized and white-light laser devices.

[0012] 2. By changing the type of gain dye in the nested cavity, single-color, dual-color and full-color whispering gallery lasers can be obtained.

[0013] 3. The nested cavity structure can avoid fluorescence energy transfer and reduce the laser threshold. The smooth surface can produce a high-quality whispering gallery laser.

[0014] 4. The method of the present invention does not require the use of expensive equipment and has the advantages of low preparation cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the nested cavity structure of the present invention.

[0016] Among them, 1.1, long wavelength laser, 1.2, short wavelength laser, 1.3, full-color laser;

[0017] Figure 2 It is a light path diagram of the emission spectrum testing system in the present invention.

[0018] Among them, 2.1, pump source, 2.2, attenuator, 2.3, cylindrical lens;

[0019] Figure 3 This is a top view of a multi-color whispering gallery laser with a nested cavity structure in the present invention.

[0020] Figure 4 These are the monochromatic, dual-color and full-color spectra of a nested cavity structure multi-color whispering gallery laser in the present invention.

[0021] Figure 5 This is a color gamut diagram of a nested cavity structure multi-color whispering gallery laser in the present invention. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0023] A nested cavity structure multi-color whispering gallery laser, characterized in that: the laser comprises hollow-core optical fibers with the same wall thickness and different inner diameters, namely, hollow-core optical fiber I (1.1) and hollow-core optical fiber II (1.2), and gain materials (1.4, 1.5, 1.6);

[0024] The hollow-core fiber I (1.1) serves as a laser resonant cavity with a smaller inner diameter, emitting long-wavelength laser light, and the hollow-core fiber II (1.2) serves as a laser resonant cavity with a larger inner diameter, emitting short-wavelength laser light.

[0025] The gain materials are PFO, F8BT and MDMO-PPV.

[0026] Hollow core optical fiber is made of glass, quartz, etc.

[0027] Different combinations of gain dyes can produce single-color, dual-color, and full-color whispering gallery lasers.

[0028] Example 1: A method for manufacturing a nested cavity structure multi-color whispering gallery laser, comprising the following steps:

[0029] PFO, F8BT and MDMO-PPV were dissolved in xylene to form a PFO xylene solution with a concentration of 12.5 mg / ml, a F8BT xylene solution with a concentration of 22.5 mg / ml and a MDMO-PPV xylene solution with a concentration of 8.5 mg / ml.

[0030] Take an appropriate amount of MDMO-PPV solution and inject it into a hollow core optical fiber I with an inner diameter of 0.5 mm and a wall thickness of 0.15 mm, and seal it with polyvinyl alcohol solution. Figure 1 .

[0031] The hollow core fiber II with an inner diameter of 0.9 mm and a wall thickness of 0.15 mm is nested on the hollow core fiber I. An appropriate amount of F8BT solution is injected into the hollow core fiber II and the polyvinyl alcohol solution is sealed. Figure 1 .

[0032] A suitable amount of PFO solution was dropped onto the surface of hollow core fiber II to obtain a device with nested cavity structure. Figure 2 .

[0033] A nanosecond laser with a wavelength of 343 nm (frequency-tripled 1030 nm Yb:YAG laser; repetition rate: 600 Hz; pulse width: 1 ns) is used as the pump source. The irradiation light covers the entire nested cavity laser, thereby obtaining a full-color whispering gallery laser. Figure 3 ,4,5.

[0034] The present invention provides a multi-color whispering gallery laser with a nested cavity structure. The basic principle and main manufacturing method of the present invention are shown and described above.

Claims

1. A nested cavity structure multi-color whispering gallery laser, comprising a pump source, a gain medium, and a hollow-core fiber; characterized by: The gain medium is an organic semiconductor material, and the hollow-core optical fiber has a whispering gallery microcavity structure; the hollow-core optical fibers with equal wall thickness and different inner diameters are nested together to form a nested cavity structure, and the organic semiconductor material is injected into the nested cavity structure in a certain order; a pump source excites the organic semiconductor material; The organic semiconductor solution is injected into the nested cavities in sequence and sealed with hydrogel to prepare a nested cavity structure multi-color whispering gallery laser. When stimulated by external pump light, the organic semiconductor solution absorbs the pump light energy and realizes the inversion of the particle number; in the hollow-core fiber resonator, the electromagnetic waves of a specific frequency undergo multiple total reflections in the hollow-core fiber resonator, fully realizing the interaction between light and the organic semiconductor material, thereby realizing the emission of the whispering gallery laser.

2. The nested cavity structure multi-color whispering gallery laser according to claim 1, characterized in that the organic semiconductor material of the gain medium is PFO, F8BT and MDMO-PPV.

3. The multi-color whispering gallery laser with a nested cavity structure according to claim 1, wherein the nested cavity structures are hollow-core fibers with the same wall thickness and different inner diameters; the nested cavity structures are respectively labeled as hollow-core fiber I and hollow-core fiber II.

4. The nested cavity structure multi-color whispering gallery laser according to claim 1 or 3, characterized in that the hollow-core optical fiber is glass or quartz.

5. The nested cavity structure multi-color whispering gallery laser according to claim 3, characterized in that: the hollow-core fiber I is a laser resonant cavity with a small inner diameter, emitting long-wavelength laser light; the hollow-core fiber II is a laser resonant cavity with a large inner diameter, emitting short-wavelength laser light.

6. The multi-color whispering gallery laser with a nested cavity structure according to claim 5 is characterized in that: a nested process is used to manufacture the resonant cavity of the nested cavity structure, and the types of gain dyes in the nested cavity are changed. Different gain dyes are excited by pump light simultaneously to obtain single-color, dual-color, and full-color whispering gallery lasers.

7. A method for manufacturing a multi-color whispering gallery laser with a nested cavity structure according to claim 1, characterized in that: The following steps are involved: (1) PFO, F8BT, and MDMO-PPV were dissolved in xylene to form a 12.5 mg / ml PFO xylene solution, a 22.5 mg / ml F8BT xylene solution, and an 8.5 mg / ml MDMO-PPV xylene solution; (2) Take an appropriate amount of MDMO-PPV solution and inject it into a hollow-core optical fiber 1 with an inner diameter of 0.5 mm and a wall thickness of 0.15 mm, and seal it with polyvinyl alcohol solution; (3) A hollow-core optical fiber II with an inner diameter of 0.9 mm and a wall thickness of 0.15 mm is nested on the hollow-core optical fiber I; Inject F8BT solution into hollow core optical fiber II and seal it with polyvinyl alcohol solution; (4) drop-coating the PFO solution on the surface of hollow-core optical fiber II to obtain a nested cavity structure; (5) A nanosecond laser with a wavelength of 343 nm is used as the pump source, and the irradiation light covers the entire nested cavity laser, thereby obtaining a full-color whispering gallery laser.

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