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Multiband echo wall mode type fiber laser based on polydimethylsiloxane (PDMS) and processing method thereof

A technology of whispering gallery mode, fiber laser, applied in laser parts, structure/shape of active medium, etc., can solve the problems of lack of directional radiation, not easy to miniaturize, poor stability, etc. effect of low pumping threshold energy and compensating for poor stability

Inactive Publication Date: 2012-09-19
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this whispering gallery mode fiber laser suffers from the disadvantages of not being easy to miniaturize, poor stability and lack of directional radiation, hindering the possibility of directly integrating it as a miniature laser on a chip

Method used

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  • Multiband echo wall mode type fiber laser based on polydimethylsiloxane (PDMS) and processing method thereof
  • Multiband echo wall mode type fiber laser based on polydimethylsiloxane (PDMS) and processing method thereof
  • Multiband echo wall mode type fiber laser based on polydimethylsiloxane (PDMS) and processing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] use figure 2 The shown device uses a frequency-doubled YAG laser with a wavelength of 532nm as the pumping light. After the pumping light is converged by a focusing lens with a focal length of 20 mm, the θ i =29 o The incident cone angle enters the front end of the optical fiber 3, θ i less than the maximum incident aperture angle θ ic =22.7 o , the light propagates in the PDMS segment 4 by total reflection, and the incident angle of the light entering the gain cladding segment 6 at the fiber interface is θ t =80.1 o , greater than the critical angle of incidence θ c =69.2 o , Therefore, the pumping light propagates along the fiber axis (Z axis) in the gain cladding section 6 in a way of frustrated total reflection. Any section perpendicular to the fiber axis forms a cylindrical microcavity. The evanescent field 7 of the pump light in the gain cladding solution excites the dye to generate gain, and the photons in the evanescent field 8 of the cylindri...

Embodiment 2

[0045] image 3 It is the relationship between the laser radiation intensity and the pumping energy. The upper left illustration is the laser spectrum of the whispering gallery mode with a medium resolution collected by a grating with a density of 2400 g / mm. Depend on image 3 It can be seen that when the pumping energy exceeds 8.7 μJ, the laser radiation intensity increases sharply, and the pumping energy of 8.7 μJ is the threshold energy of the whispering gallery mode laser.

Embodiment 3

[0047] Figure 4 is a concentration of 4×10 -3 mol / L rhodamine B ethanol solution produces whispering gallery mode laser generation as a function of pumping energy. The triangle symbol "▲" indicates the experimental value, and the solid line is the theoretical fitting value. Depend on Figure 4 It can be seen that when the pumping energy is low, the generation length of the whispering gallery mode laser increases rapidly with the increase of the pumping energy. After the laser generation length reaches a certain value, the generation length of the laser increases rapidly with the increase of energy. Slowing down, continuing to increase the energy does not significantly increase the length of laser generation. Utilizing the feature that the whispering gallery mode laser has a longer generation length along the fiber axis, the axial segment of the fiber ( figure 1 5) Filling different laser gain medium solutions can simultaneously realize the directional output of multi-ba...

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Abstract

The invention discloses a multiband echo wall mode type fiber laser based on polydimethylsiloxane (PDMS). The laser and a light-guiding optical fiber are integrated on the same chip by using the PDMS as a substrate, namely a multimode silica optical fiber with single refractive index and at least one wedge-shaped optical fiber are coupled at different positions and then embedded into the PDMS substrate, at least one optical fiber groove is carved on the coupling contact position of the PDMS substrate and the silica optical fiber and the wedge-shaped optical fiber, gain cladding dielectric solution with low refractive index is respectively filled in the optical fiber grooves, and the substrate is packed so that the multiband echo wall mode type fiber laser is formed. The multiband echo wall mode type fiber laser adopts an axial evanescent wave and light pumping mode along the optical fiber, optical feedback is provided by laser gain through an echo wall mode with extremely high quality factor in an optical round resonant cavity, and laser radiation with long generation length and extremely low threshold is achieved. The multiband echo wall mode type fiber laser based on PDMS is simple in process and low in manufacturing cost, achieves directional output on one chip simultaneously, and provides fluorescence or laser sources for biochemical experiments in a laboratory on the chip.

Description

technical field [0001] The invention belongs to the technical field of laser and microfluidic optics, and relates to an optical fiber laser that realizes multi-band whispering gallery mode laser directional output on one chip at the same time through the evanescent field excitation gain of the pumped light by means of optical pumping and its processing method. Background technique [0002] The miniaturization and integration of optical devices and the adjustment of optical parameters are one of the main directions of the development of modern optical technology. Traditional optical devices have defects such as large volume, high cost, poor adjustability and stability, which directly hinder the miniaturization and integration process of modern optical systems. In order to reduce costs, reduce labor input, and improve experimental accuracy and repeatability, modern optical research often needs to integrate multiple experimental functions on an independent chip, that is, "lab ...

Claims

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Application Information

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IPC IPC(8): H01S3/02H01S3/067
Inventor 张远宪普小云刘春冯黎
Owner YUNNAN UNIV
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