DOE and diffuser realized by high accuracy glass processing technologies

Applications

  • Sensing
  • AR/VR/MR
  • Security
  • Projector
  • Optical communications
  • Lighting
  • Laser beam shaping
  • Diffractive optical element(DOE)

    Features

  • One-stop service from design, prototyping through evaluation
  • Accumulated skills and experience on DOE processing
  • Small 0th order transmission, high efficiency, high durability
  • Capabilities of very large FOV and high density dot projection
  • Multi-level steps processing
  • Diffractive optical element (DOE)

    DOE has micro structured surface relief patterns which cause light diffraction. By engineering the diffraction, DOE can split, homogenize, and focus laser beams. A few examples of output beam patterns are illustrated below.

    Appearance of DOE and its surface microstructure

    Laser beam can be controlled using DOE

    DOE design and fabrication by AGC

    In AGC, we are developing and producing DOE using technologies cultivated though production of optical pickup and optical communication components. Our one-stop engineering service supports our customers from design through large volume mass production using originally developed simulation tools, materials, and rapid cycles of design and process optimization.
    With accumulated skills and experience through our long-term technology development, our DOE enables low 0th order transmission, wide FOV, and large number dot projection. Using glass, our DOE also has high reliably against thermal, humidity, and laser damage.

    Examples of DOE

    A few examples of our DOE are shown here. For details or if you have any questions, please get in touch using the form at the bottom of the page.

    Logo

    ~1k dot projection

    Uniform pattern projection

    Glass diffuser

    Features

  • One-stop service from design, prototyping through evaluation
  • Flat-top or 1/cosn θ intensity profile
  • Rectangular, circular beam shapes
  • Tailoring X and Y diffusing angle, respectively
  • Wide FOV
  • High efficiency with little diffusion outside target area
  • Custom design using originally developed know-hows
  • By micro-structuring glass surface, our diffuser tailors laser intensity profiles. While the far-field pattern becomes Gaussian when laser is input on typical diffusive material (e.g. frost glass), our diffuser can shape the laser circle or rectangle and control the intensity profiles (flat-top or 1/cosnθ). Our cut-off profile make little light diffuse outside the projected area, making it high efficiency.

    Uniform intensity profile using a diffuser

    Frosted glass

    Flat-top diffuser

    Flat-top diffuser by AGC

    Because our diffuser is using only inorganic materials, it has several advantages over polymer diffusers: easy to coat AR (anti-reflective) layer, high efficiency, high durability, and high laser induced damage threshold.
    Like DOE, our one-stop engineering service supports our customers from design through large volume mass production using originally developed simulation tools, materials, and rapid cycles of design and process optimization.

    Examples of diffuser

    Cultivated through our glass engineering innovations, we can fabricate various types of diffusers. The Figures below show some examples designed for different wavelengths and diffusing shapes.

    Square

    Rectangle

    Circle

    These Figures show tailored intensity profiles. For details or if you have any questions, please get in touch using the form at the bottom.

    Flat-top intensity profile

    1/cosnθ intensity profile

    Applications in 3D sensing

    In recent years, 3D sensing technologies have been applied in distance measurement face unlock, online payment, security, automotive, LiDAR, etc. Each application requires different metrics, and stereo vision, structured light, and time of flight (TOF) are widely used depending on the applications as summarized in the Table.
    Structured light technology reconstructs projected patterns created by shadow mask or DOE. TOF technology uses diffuser, and it measures light travelling from a light source, hitting a target, and reflected back to a sensor.
    In AGC, we are providing various solutions for 3D sensing (e.g. IR transmitting cover glass, glass ceramic packaging substrate(GCHPTM), optical filters, and lenses) as well as DOE and diffuser. The figure below shows how our technologies are used in 3D sensing applications.

    DOE and diffuser, Cover glass, Optical fiters, LD/LED packaging glass-ceramics, Lenses

    AGC products used for 3D sensing

    Table 3D sensors comparison and related AGC products

    Stereo vision Structured light Time of flight (TOF)
    principle
    triangulation
    pattern geometric
    reconstruction
    direct depth
    measurement
    applications
    gesture sensor
    AR/VR/MR
    face unlock
    gesture sensor
    industrial
    AR/VR/MR
    LiDAR
    3D depth mapping
    gesture sensor
    LiDAR
    We can customize optical components for various applications.
    Please inquiry from the form below.
    AGC products
    Light control
    waveplate
    DOE & diffuser
    focus / collimate
    lens
    cover materials
    Strengthened glass, IR pass glass
    IR filter
    multi-layer coating
    LD/LED package substrate
    GCHPTM