Laser therapeutic apparatus

• US 20030120325A1
• Filed: 10/25/2002
• Published: 06/26/2003
• Est. Priority Date: 04/27/2000
• Status: Active Grant

• Current Assignee: Hamamatsu Photonics KK
• Original Assignee: Hamamatsu Photonics KK
• Inventors: Fujisaka, Shinichi, Miyaki, Sueo, Hara, Tsutomu, Ichie, Koji
• Granted Patent: US 6,808,523 B2
• Time in Patent Office: Days
• US Class Current: 607/89
• CPC Class Codes: A61F 2009/00863 Retina
• CPC Class Codes: A61F 9/008 using laser
• CPC Class Codes: G03H 1/0005 Adaptation of holography to specific applications holographic optical element G02B5/32; holographic scanner G02B26/106; recognition using holographic mask G06V10/88; holographic memories G11B7/0065, G11C13/042
• CPC Class Codes: G03H 1/2294 Addressing the hologram to an active spatial light modulator
• CPC Class Codes: G03H 2225/25 Optically addressed SLM [OA-SLM]

Abstract

This apparatus includes a laser light source S2 which irradiates a spatial light modulator (SLM) 11 with a laser beam LR. Individual optical systems are arranged such that the laser beam reflected by the SLM 11 irradiates a region to be treated. When this configuration is used, the laser beam reflectivity can be made much higher than when a transmitting device is used. This allows high-efficiency laser beam irradiation. A predetermined pattern is written in the SLM 11, and this predetermined pattern is preferably a hologram pattern.

Claims

1. A laser therapeutic apparatus for irradiating a region to be treated with a laser beam, comprising:

a reflecting spatial light modulator which displays a predetermined pattern;

a laser light source which irradiates said spatial light modulator with a laser beam; and

an optical system so positioned that the laser beam reflected by said spatial light modulator irradiates the region to be treated.

2. A laser therapeutic apparatus according to claim 1,

wherein the predetermined pattern is a hologram pattern so set that in the region to be treated, the laser beam reflected by said spatial light modulator has the same shape as an image of the region to be treated.

3. A laser therapeutic apparatus according to claim 1,

wherein a liquid crystal display for displaying the pattern is placed adjacent to said spatial light modulator, and a laser beam emitted from a light source different from said light source irradiates said spatial light modulator via said liquid crystal display to write the pattern in said spatial light modulator, thereby displaying the pattern on said spatial light modulator.

4. A laser therapeutic apparatus according to claim 3, wherein said spatial light modulator comprises a light sensor film in which the impedance of a region irradiated with light lowers, a transparent electrode which transmits a laser beam, a liquid crystal layer interposed between said light sensor film and said transparent electrode, and a dielectric mirror which reflects a laser beam.

5. A laser therapeutic apparatus according to claim 1, further comprising an illuminating system which illuminates the region to be treated, and an observation system which observes the region to be treated.

6. A laser therapeutic apparatus according to claim 5,

wherein said observation system comprises an optical filter which transmits only fluorescence emitted from the region to be treated.

7. A laser therapeutic apparatus according to claim 5,

wherein said observation system comprises a video camera which senses a fluorescent image from the region to be treated, and the predetermined pattern displayed on said spatial light modulator is generated on the basis of the fluorescent image sensed by said video camera.