Machining of fusion-drawn glass laminate structures containing a photomachinable layer

A glass structure comprising:

• a first cladding layer formed from a first-clad glass composition having a first-clad photosensitivity;
• a second cladding layer formed from a second-clad glass composition having a second-clad photosensitivity;
• and
• a core layer interposed between the first cladding layer and the second cladding layer and formed from a core glass composition, wherein:
• the first cladding layer and the second cladding layer are photomachinable;
• the core layer is transparent to ultraviolet (UV) radiation such that, upon exposure of the core layer to the UV radiation, the UV radiation penetrates through the core layer;
• and
• at least one of the first cladding layer or the second cladding layer comprises an ion exchanged region.

A glass structure comprising:

• a first cladding layer formed from a first-clad glass composition having a first-clad photosensitivity;
• a second cladding layer formed from a second-clad glass composition having a second-clad photosensitivity;
• and
• a core layer interposed between the first cladding layer and the second cladding layer and formed from a core glass composition having a core photosensitivity, wherein:
• the first cladding layer and the second cladding layer are photomachinable;
• the first cladding layer is fused to a first surface of the core layer with a diffusive layer formed between the first cladding layer and the core layer;
• the second cladding layer is fused to a second surface of the core layer with a diffusive layer formed between the second cladding layer and the core layer;
• the core photosensitivity is greater than at least one of the first-clad photosensitivity or the second-clad photosensitivity;
• and
• any one of the following:
• the core layer comprises a crystallized region and an uncrystallized region and at least one of the first clad layer or the second clad layer is uncrystallized;
• or
• the core layer comprises a void and at least one of the first clad layer or the second clad layer is uncrystallized.

A glass structure comprising:

• a first cladding layer formed from a first-clad glass composition having a first-clad photosensitivity;
• a second cladding layer formed from a second-clad glass composition having a second-clad photosensitivity;
• and
• a core layer interposed between the first cladding layer and the second cladding layer and formed from a core glass composition having a core photosensitivity, wherein:
• the first cladding layer and the second cladding layer are photomachinable;
• the first cladding layer is fused to a first surface of the core layer with a diffusive layer formed between the first cladding layer and the core layer;
• the second cladding layer is fused to a second surface of the core layer with a diffusive layer formed between the second cladding layer and the core layer;
• the core photosensitivity is less than at least one of the first-clad photosensitivity or the second-clad photosensitivity;
• the first cladding layer and the second cladding layer each comprises a hole structure;
• the core layer comprises a crystallized region connecting the hole structure of the first cladding layer and the hole structure of the second cladding layer;
• and
• the crystallized region is narrower than the hole structure of the first cladding layer and the hole structure of the second cladding layer.