Laser emitting material, method for making the same and use thereof

a laser emitting device and laser technology, applied in the direction of active medium materials, instruments, optical elements, etc., can solve the problems of restricting the applicability of such lasers, inhibiting the use of such lasers in these applications, and few workable polymeric systems reported. achieve the effect of lowering the threshold

Inactive Publication Date: 2007-04-26
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] Therefore, it is an object of the present invention to provide an improved laser device with a relatively lower threshold, or at least provide the public with a useful choice.

Problems solved by technology

However, up to now, very few workable polymeric systems have been reported.
However, the relatively high threshold of Balachandran and Ling's laser devices may restrict its applicability.
However, the threshold restrictions on the laser devices using polymeric solids may Inhibit the use of such lasers in these applications as well.

Method used

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  • Laser emitting material, method for making the same and use thereof
  • Laser emitting material, method for making the same and use thereof
  • Laser emitting material, method for making the same and use thereof

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Embodiment Construction

[0031] As discussed in details below, the exemplary laser emitting device embodiments of the present invention can be in the format of laser films, textiles, micro laser clusters or random laser fibers. Each includes three major components, namely, a polymer matrix as the host material (for example PMMA or PVA), gain or amplifying media or materials (for example laser dyes or conjugated polymer), and particles as scatters (for example TiO2 or ZnO, etc). When a wide-banded flash lamp or pulsed laser pumps the gain materials of such laser emitting devices, the laser emitting devices emit monochromatic lasers with high power. By changing the gain materials, laser emission with different wavelength such as 585 nm and 610 nm can be realized. In addition, particles have scattering functions and can enlarge the path photons pass in the medium. The path increase produces Amplified Spontaneous Emission. Ordered particle distribution in the localized field act as a feedback cavity and provide...

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Abstract

A solid-state laser emitting material for use in conjunction with a light source includes a polymer matrix functioning as host materials, containing laser dye of rhodamine 590 or rhodamine 610 as gain materials and nano-submicron particles as scatters therein. The lowest lasing threshold of the laser emitting material is approximately 5 mJ/cm2 for 585 nm emission and 2 mJ/cm2 for 630 nm emission.

Description

BACKGROUND [0001] 1. Field of the Invention [0002] The present application relates to laser emitting devices, method for making the same and use thereof. [0003] 2. Background of the Invention [0004] Random laser devices have been known in the art. For example, C. Zacharrakis, “Random lasing following two-photon excitation of highly scattering gain media Applied Physics Letters,” 81, 2511 (2002) discloses the use of a femtosecond pulse laser at the wavelength of 800 nm to two-photon excite Coumarin 307 colloid solution to obtain 480 blue emission. B. Raghavendra Prasad, et al, “Lasing in active, sub-mean-free path-sized systems with dense, random, weak scatterers,” Applied Optics, 36, 7718 (1997), discloses yellow emission by using a frequency-doubled Nd:YAG laser to pump colloid solution containing Rhodamine 590 perchlorate and polystyrene micro-spheres. S. John et al, “Theory of lasing in a multiple-scattering medium,” Phys. Rev. A, 54, 3642 (1996), H. Cao, “Lasing with resonant fe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01S3/20
CPCG02B6/02033G02B6/0229H01S3/06716H01S3/094H01S3/168H01S3/169H01S2301/04
Inventor TAO, XIAOMINGSUN, XIAOHONGDENG, JIANGUOKWAN, KAI-CHEONG
Owner THE HONG KONG POLYTECHNIC UNIV
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