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DPB/DPSQ/DPTIH11
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Equilateral prisms are normally used for the dispersion of light into its different colors. Light incident at an oblique angle to the first face is dispersed according to its wavelength and emerges as a spectrum from the opposite face. We offer these prisms made from BK7, Synthetic Fused Silica and S-TIH11 optical glass.

◦The roof angle of 60 degrees causes the best combination of wide dispersion and low reflection losses. A glass with large dispersive power or small Abbe’s number leads to large angular dispersion.
◦We offer both BK7 and fused silica for wavelengths from UV to near IR. We recommend a prism of BK7 if the light is not UV, because the angular dispersion of BK7 is larger than that of fused silica.
◦The DPTIH11 uses high index glass resulting in superior dispersion.

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Technical Data
Documents/Downloads
Guide

▶We offer Prism Holders (PLH) to mount each of our catalog equilateral dispersing prisms. W4025
▶Consult our Sales Division for custom sizes.
▶Please refer to here for Wavelength Characteristic Data (Reference Data, EXCEL file format).

Attention

▶Every edge of these prisms is chamfered (beveled) for chipping prevention. The dimensions of these prisms are values not including chamfer.
▶Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.

Common Specifications
Part numberDPB DPSQ DPTIH11
Material BK7 Synthetic fused silicaS-TIH11 equivalent
Refractive index nd 1.5171.4581.785
Minimum deviation68.7°63.6° 96.4°
Abbe number νd64.167.825.7
Apex angle60 °±3′ 60 °±3′ 60 °±3′
Surface flatness of substrateλ/10λ/10λ/4
Surface Quality
(Scratch-Dig)
20-1020−10 40−20
Clear apertureCircle that inscribed in a square of 90% of the dimensions A and B
Outline Drawing
■DPB/DPSQ

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■DPTIH11

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Schematic

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Typical Transmittance Data

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T: Transmission
Glass refractive index measurement method of minimum deviation

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The refractive index of optical glass is accurately measured by the angle measuring device called a goniometer.
Accurately measuring the refractive index for each wavelength with the known wavelength of the emission spectrum of the lamp is emitted.
Wavelength dispersion of the refractive index is determined by the results of this measurement.

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Part Number
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    JP Yen Stock Qty
DPB-20-10H
DPB-25-10H
DPB-30-10H
DPSQ-20-10H
DPSQ-25-10H
DPSQ-30-10H
DPTIH11-20-4H
DPTIH11-25-4H
DPTIH11-30-4H

BK7

20mm

BK7

25mm

BK7

30mm

Synthetic fused silica

20mm

Synthetic fused silica

25mm

Synthetic fused silica

30mm

S-TIH11

20mm

S-TIH11

25mm

S-TIH11

30mm

RoHS  

¥20,900

LOW
RoHS  

¥30,400

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US
RoHS  

¥39,900

LOW
RoHS  

¥28,500

LOW
RoHS  

¥38,000

LOW
RoHS  

¥47,500

IN STOCK
RoHS  

¥7,300

IN STOCK
RoHS  

¥7,600

IN STOCK
RoHS  

¥9,500

IN STOCK