High-Power Laser Beam Expander (Fixed magnification) / BEHP
These laser beam expanders are designed for use with a high-power laser.
It supports a broader wavelength range than the current models.
It can be used in an optical system with high precision, such as a laser interferometer and processing by the lens design that takes into account the wavefront aberration.
The optical design of the beam expander is an air gap configuration that does not use an adhesive to bond the lenses. This allows the beam expander to be used with a high-power laser.It is designed and coated to enable to use in a broader wavelength range than the current models.
By turning the diopter ring that is attached to the center of the beam expander, you can make variable beams such as the focused beam, collimated beam, and the divergent beam. It is used when you want to vary the position of the beam waist and if strict collimation adjustment is necessary.
Common Specifications
| Material | Synthetic fused silica |  |
|---|---|---|
| Housing Material | Aluminum | |
| Housing Finish | Black anodized | |
| Incident Angle | 0° | |
| Pointing | ＜0.5mrad (Reference value) |
| Outline Drawing(BEHP-1.5/-2/-3) | Outline Drawing(BEHP-4/-5/-6/-7/-8/-9/-10) |
|---|---|
 |
 |
| Specifications (Magnification) | ||||||
|---|---|---|---|---|---|---|
| Part Number | Beam Magnification | Output Aperture Diameter | Input Clear Aperture | Effective Incident Beam Diameter at Incident Angle ±1° | Transmitted wavefront distortion (P-V)*3 | Weight |
| BEHP-1.5 | 1.5x | φ26mm | φ11mm | φ6mm | <λ/10 (design value for input dia. of 6mm) Reference <λ/4 (nput beam dia. 6mm, 632.8nm) |
0.25kg |
| BEHP-2 | 2x | φ26mm | φ10mm | φ6mm | <λ/10 (design value for input dia. of 6mm) Reference <λ/4 (nput beam dia. 6mm, 632.8nm) |
0.21kg |
| BEHP-3 | 3x | φ26mm | φ8mm | φ6mm | <λ/10 (design value for input dia. of 6mm) Reference <λ/4 (nput beam dia. 6mm, 632.8nm) |
0.21kg |
| BEHP-4 | 4x | φ35mm | φ6mm | φ6mm | <λ/10 (design value for input dia. of 6mm) Reference <λ/4 (nput beam dia. 6mm, 632.8nm) |
0.27kg |
| BEHP-5 | 5x | φ35mm | φ5mm | φ5mm | <λ/10 (design value for input dia. of 5mm) Reference <λ/4 (nput beam dia. 5mm, 632.8nm) |
0.27kg |
| BEHP-6 | 6x | φ35mm | φ4mm | φ4mm | <λ/10 (design value for input dia. of 4mm) Reference <λ/4 (nput beam dia. 4mm, 632.8nm) |
0.27kg |
| BEHP-7 | 7x | φ35mm | φ3mm | φ3mm | <λ/10 (design value for input dia. of 3mm) Reference <λ/4 (nput beam dia. 3mm, 632.8nm) |
0.27kg |
| BEHP-8 | 8x | φ35mm | φ3mm | φ3mm | <λ/10 (design value for input dia. of 3mm) Reference <λ/4 (nput beam dia. 3mm, 632.8nm) |
0.27kg |
| BEHP-9 | 9x | φ35mm | φ2.5mm | φ2.5mm | <λ/10 (design value for input dia. of 2.5mm) Reference <λ/4 (nput beam dia. 2.5mm, 632.8nm) |
0.27kg |
| BEHP-10 | 10x | φ35mm | φ2mm | φ2mm | <λ/10 (design value for input dia. of 2mm) Reference <λ/4 (nput beam dia. 2mm, 632.8nm) |
0.27kg |
*3 Transmitted wavefront distortion is design value and not guaranteed. Transmitted wavefront distortion is not measured at the design wavelength.
| Specifications（wavelength range） | ||||
|---|---|---|---|---|
| Part Number | Design Wavelength | AR Coating Wavelengths | Transmittance (AR coat calculated value)*2 | Laser Damage Threshold*1 |
| BEHP-1.5~-3-250/280 | 250-266nm | 250-280nm | >99％ (266nm), >97％ (257.5nm) 97％ (250 - 280nm), >65％ (600 - 700nm) |
2J/cm2 |
| BEHP-1.5~-3-340/380 | 340-355nm | 340-380nm | >99％ (355nm), >97％ (343.3nm) 97％ (340 - 380nm), >65％ (600 - 700nm) |
4J/cm2 |
| BEHP-1.5~-3-500/570 | 500-532nm | 500-570nm | >99％ (532nm), >98％ (515nm) 98％ (500 - 570nm), >65％ (600 - 700nm) |
5J/cm2 |
| BEHP-1.5~-3-1030/1100 | 1030-1064nm | 1030-1100nm | >99％ (1064nm), >98％ (1030nm) 98％ (1030 - 1100nm), >65％ (600 - 700nm) |
7J/cm2 |
| BEHP-4~10-250/280 | 250-266nm | 250-280nm | >98％ (266nm), >96％ (257.5nm) 96％ (250 - 280nm), >53％ (600 - 700nm) |
4J/cm2 |
| BEHP-4~10-340/380 | 340-355nm | 340-380nm | >98％ (355nm), >96％ (343.3nm) 96％ (340 - 380nm), >53％ (600 - 700nm) |
4J/cm2 |
| BEHP-4~10-500/570 | 500-532nm | 500-570nm | >98％ (532nm), >97％ (515nm) 97％ (500 - 570nm), >53％ (600 - 700nm) |
7J/cm2 |
| BEHP-4~10-1030/1100 | 1030-1064nm | 1030-1100nm | >98％ (1064nm), >97％ (1030nm) 97％ (1030 - 1100nm), >53％ (600 - 700nm) |
10J/cm2 |
*1 Laser pulse width; 10ns , Repetition frequency; 20Hz
*2 The transmittance of the beam expander differs depending on the wavelength and/or input beam diameter.
| Magnification╲Wavelength | BEHP-1.5~-3 -250/280 |
BEHP-1.5~-3 -340/380 |
BEHP-1.5~-3 -500/570 |
BEHP-1.5~-3 -1030/1100 |
|---|---|---|---|---|
| BEHP-1.5 | BEHP-1.5-250/280 | BEHP-1.5-340/380 | BEHP-1.5-500/570 | BEHP-1.5-1030/1100 |
| BEHP-2 | BEHP-2-250/280 | BEHP-2-340/380 | BEHP-2-500/570 | BEHP-2-1030/1100 |
| BEHP-3 | BEHP-3-250/280 | BEHP-3-340/380 | BEHP-3-500/570 | BEHP-3-1030/1100 |
| Magnification╲Wavelength | BEHP-4~-10 -250/280 |
BEHP-4~-10 -340/380 |
BEHP-4~-10 -500/570 |
BEHP-4~-10 -1030/1100 |
| BEHP-4 | BEHP-4-250/280 | BEHP-4-340/380 | BEHP-4-500/570 | BEHP-4-1030/1100 |
| BEHP-5 | BEHP-5-250/280 | BEHP-5-340/380 | BEHP-5-500/570 | BEHP-5-1030/1100 |
| BEHP-6 | BEHP-6-250/280 | BEHP-6-340/380 | BEHP-6-500/570 | BEHP-6-1030/1100 |
| BEHP-7 | BEHP-7-250/280 | BEHP-7-340/380 | BEHP-7-500/570 | BEHP-7-1030/1100 |
| BEHP-8 | BEHP-8-250/280 | BEHP-8-340/380 | BEHP-8-500/570 | BEHP-8-1030/1100 |
| BEHP-9 | BEHP-9-250/280 | BEHP-9-340/380 | BEHP-9-500/570 | BEHP-9-1030/1100 |
| BEHP-10 | BEHP-10-250/280 | BEHP-10-340/380 | BEHP-10-500/570 | BEHP-10-1030/1100 |
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