Organic laser based on holographic polymer dispersed liquid crystal grating
An organic laser, disperse liquid crystal technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of limiting the development of DFB lasers, poor parameter controllability, poor flexibility, etc., to achieve wide application value, low cost, High-efficiency preparation
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0034] The preparation steps of an organic laser based on a holographic polymer dispersed liquid crystal grating are as follows:
[0035] (1) Add 6 mg of MEH-PPV into 1 mL of xylene and stir to dissolve completely, and prepare a mixed solution of 6 mg / mL of MEH-PPV;
[0036] (2) Select glass with ITO film as the substrate (25 mm in length, 20 mm in width, and 2 mm in thickness), and spin-coat the MEH-PPV mixed solution into a film with a thickness of about 80 nm;
[0037] (3) The glass substrate coated with MEH-PPV film and another clean glass substrate are prepared into a liquid crystal cell, and the thickness of the cell is controlled by a spacer to 6 ;
[0038] (4) 30 wt.% photosensitive monomer diethylene glycol diacrylate (PDDA), 30 wt.% dipentaerythritol hydroxypentaacrylate (DPHPA), 28 wt.% nematic liquid crystal TEB30A, 10 Wt.% crosslinker N-vinylpyrrolidone (NVP), 1.5 wt.% co-initiator N-phenylglycine (NPG), 0.5 wt.% photoinitiator Rose Bengal mixed evenly to make ...
Embodiment 2
[0042] Prepare the liquid crystal cell filled with the prepolymer solution according to the preparation steps (1) to (4) in Case 1.
[0043] The liquid crystal cell injected with the prepolymer solution was exposed for 10 minutes in the interference field formed by two continuous laser beams (532 nm), and the included angle of the interference light was changed to prepare holographic polymer dispersed liquid crystal gratings with different periods.
[0044] A Nd:YAG frequency-doubled pulsed laser (532 nm, 8 ns, 2 Hz.) was used as the pump source to excite the prepared samples. The grating period was different and the wavelength of the emitted laser light was different, such as Figure 4 shown.
Embodiment 3
[0046] Prepare the liquid crystal cell according to the preparation steps (1) to (3) in Case 1.
[0047] 60 wt.% photosensitive monomer diethylene glycol diacrylate (PDDA), 28 wt.% nematic liquid crystal TEB30A, 10 wt.% cross-linking agent N-vinylpyrrolidone (NVP), 1.5 wt. % co-initiator N-phenylglycine (NPG) and 0.5 wt.% photoinitiator Rose Bengal were mixed evenly to make a prepolymer mixed solution, and the prepolymer mixed solution was injected into the above-mentioned liquid crystal cell in a dark room.
[0048] The liquid crystal cell injected with the prepolymer solution was exposed for 10 minutes in the interference field formed by two continuous laser beams (532 nm). The angle between the two beams of interference light was 86°, and the period of the holographic polymer dispersed liquid crystal grating was 390 nm. The intensity of each beam of interference light is 4.5 mW / cm 2 .
[0049] A Nd:YAG frequency-doubled pulsed laser (532 nm, 8 ns, 3 Hz.) was used as the p...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Thickness | aaaaa | aaaaa |
| Thickness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More