Speckle reduction apparatus based on Mie scattering, perturbation drive, and optical reflective chamber

Patent metadata

Field	Value
Publication number	US-10078229-B2
Application number	US-201213982023-A
Country	US
Kind code	B2
Filing date	Jan 10, 2012
Priority date	Jan 29, 2011
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A speckle reduction apparatus ( 300 ) based on Mie scattering and perturbation drive is disclosed. The speckle reduction apparatus ( 300 ) comprises an optical reflective chamber ( 302 ) having an incident-light coupling device ( 301 ) and an exiting face ( 303 ) disposed thereon, and an optical device ( 308 ) which faces the incident-light coupling device ( 301 ) of the optical reflective chamber ( 302 ). The inner walls of the optical reflective chamber ( 302 ), except for the wall of light transparent exiting face ( 303 ), are mirror surfaces. The optical reflective chamber ( 302 ) is fully filled with transparent material ( 401 ) having medium particles ( 402 ) dispersed therein, which are able to induce Mie scattering of the incident laser. Either or both of the optical reflective chamber ( 302 ) and the optical device ( 308 ) are provided with a perturbation-sensitive device. The present invention may be implemented with reasonable and compact structure, achieving the following effects: low cost, effective speckle reduction, high laser efficiency, stability, safety, and uniform light intensity.

First claim

What is claimed:

1. A speckle reduction apparatus based on Mie scattering and perturbation drive, characterized in that the said apparatus comprises:
an optical reflective chamber ( 302 ) having an incident-light coupling device ( 301 ) and an light transparent exiting face ( 303 ) disposed thereon, and an optical device ( 308 ) for directing an incident laser into the optical reflective chamber ( 302 ), wherein the optical device ( 308 ) is positioned before the optical reflective chamber ( 302 ) and facing the incident-light coupling device ( 301 ) of the optical reflective chamber ( 302 );
wherein the inner walls of the optical reflective chamber ( 302 ), except for the wall of light transparent exiting face ( 303 ), have a high reflective property, and the optical reflective chamber ( 302 ) is fully filled with transparent material ( 401 ) having medium particles ( 402 ) dispersed therein, dimensions of which are able to induce Mie scattering of the incident laser, such that a total reflection and multiple Mie scattering occur within the optical reflective chamber ( 302 ); and
wherein a perturbation-sensitive device is coupled to the optical device ( 308 ), the optical reflective chamber ( 302 ) or both, and the perturbation-sensitive device senses external perturbations and randomly changes the incident states of the incident laser in response to the sensed external perturbations by moving the optical device ( 308 ), the optical reflective chamber ( 302 ) or both.

2. The speckle reduction apparatus based on Mie scattering and perturbation drive according to claim 1 , characterized in that the optical device ( 308 ) is reflective mirror, scanning micro-mirror, or optical lens.

3. The speckle reduction apparatus based on Mie scattering and perturbation drive according to claim 1 , characterized in that the transparent material ( 401 ) is a transparent solid-state material with no transmission loss for the incident laser.

4. The speckle reduction apparatus based on Mie scattering and perturbation drive according to claim 1 , characterized in that the transparent material ( 401 ) is solution including organic or inorganic solution, or sol including aerosol or liquid sol.

5. The speckle reduction apparatus based on Mie scattering and perturbation drive according to claim 1 , characterized in that the medium particles ( 402 ) are polystyrene microspheres or titanium dioxide particles.

6. The speckle reduction apparatus based on Mie scattering and perturbation drive according to claim 1 , characterized in that an anti-reflection film adapting for the waveband of the incident laser is provided on the surface of the light transparent exiting face ( 303 ) of the optical reflective chamber ( 302 ).

7. The speckle reduction apparatus based on Mie scattering and perturbation drive according to claim 1 , characterized in that the incident-light coupling device ( 301 ) comprises a light transparent incidence face having an anti-reflection film adapted for the waveband of the incident laser, or an incident-light aperture ( 304 ) having an optical coupling element disposed therein.

Assignees

• Chen Xuyuan
• Gao Wenhong
• Shi Yunbo
• Xu Meifang
• Univ North China

Inventors

• Chen Xuyuan
• Gao Wenhong
• Shi Yunbo
• Xu Meifang

Classifications

• G02B5/0236

  the diffusion taking place within the volume of the element · CPC title

• G03H1/32

  Systems for obtaining speckle elimination · CPC title

• G02B5/0205

  characterised by the diffusing properties · CPC title

• F21V7/0091

  using total internal reflection · CPC title

• G02B5/02

  Diffusing elements; Afocal elements · CPC title