# US 2025/0093015 A1 · Source-matched diffuser for low speckle illumination

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- Number: US 2025/0093015 A1
- Document ID: US20250093015A1
- Status: Published application
- Kind: A1
- Application number: 18/967,307
- Filed: 2024-12-03
- Published: 2025-03-20
- Earliest claimed: 2022-08-01
- Assignees: Viavi Solutions Inc.
- Applicants: Viavi Solutions Inc.
- Inventors: Tasso R. M. SALES
- Web page: https://patentgrep.com/patent/US20250093015A1

## CPC

- F21V 7/00: Reflectors for light sources (characterised by cooling arrangements F21V29/505)
- G02B 3/0043: {Inhomogeneous or irregular arrays, e.g. varying shape, size, height}
- G02B 27/48: Laser speckle optics
- G02B 3/0056: {arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085)}
- G02B 5/0221: {the surface having an irregular structure (G02B5/0226 takes precedence)}
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A diffuser is disclosed. A system comprising a light source and a diffuser is disclosed. The light source is aligned with a microlens of the diffuser in a static configuration. A method of reducing speckle with the system is also disclosed.

## Claims

### Claim 1

A diffuser comprising:
a random distribution of microlenses, wherein each microlens includes a scattering unit and a boundary shape,
wherein the random distribution of microlenses includes a randomized distribution of the boundary shapes; and
wherein each scattering unit is randomly distributed across a surface of the diffuser at different scales.

### Claim 2 (depends on 1)

The diffuser of claim 1, wherein the scattering unit has a surface profile characterized by slopes that are configured to spread a light beam from an associated light source away from the microlens.

### Claim 3 (depends on 1)

The diffuser of claim 1, wherein the boundary shapes of the microlenses are defined by polygonal curves.

### Claim 4 (depends on 1)

The diffuser of claim 1, wherein the scattering unit is a sag profile.

### Claim 5 (depends on 1)

The diffuser of claim 1, wherein the random distribution of microlenses include a randomized distribution of sag profiles.

### Claim 6

A system comprising:
a plurality of light sources; and
a diffuser comprising a distribution of microlenses;
wherein each light source of the plurality of light sources is aligned with a single microlens of the diffuser, and
wherein the system is in a static configuration.

### Claim 7 (depends on 6)

The system of claim 6, wherein each light source, of the plurality of light sources, is individually coherent.

### Claim 8 (depends on 7)

The system of claim 7, wherein the plurality of light sources are mutually incoherent.

### Claim 9 (depends on 6)

The system of claim 6, wherein the microlenses are present on a first surface of the diffuser oriented towards the light source.

### Claim 10 (depends on 6)

The system of claim 6, wherein the microlenses are present on a second surface of the diffuser oriented away from light source.

### Claim 11 (depends on 6)

The system of claim 6, wherein the scattering unit has a surface profile characterized by slopes that are configured to spread a light beam from an associated light source away from the microlens.

### Claim 12 (depends on 6)

The system of claim 6, wherein the boundary shapes of the microlenses are defined by polygonal curves.

### Claim 13 (depends on 6)

The system of claim 6, wherein the scattering unit is a sag profile.

### Claim 14 (depends on 6)

The system of claim 6, wherein the random distribution of microlenses include a randomized distribution of sag profiles.

### Claim 15

A method of using a system, comprising:
emitting light from a plurality of light sources, wherein each light source of the plurality of light sources is aligned with a single corresponding microlens of a plurality of microlenses of a diffuser; and
receiving the emitted light from a single light source of the plurality of light sources in the corresponding microlens of the plurality of microlenses of the diffuser;
wherein the system is in a static configuration.

### Claim 16 (depends on 15)

The method of claim 15, wherein each light source, of the plurality of light sources, is individually coherent.

### Claim 17 (depends on 16)

The method of claim 16, wherein the plurality of light sources are mutually incoherent.

### Claim 18 (depends on 17)

The method of claim 17, wherein the diffuser comprises a random distribution of microlenses, wherein each microlens includes a scattering unit and has a boundary shape.

### Claim 19 (depends on 18)

The method of claim 18, wherein each scattering unit is randomly distributed across a surface of the diffuser at different scales.