Steep cutoff (laser wavelength <0.5%) • High transmittance • Wide blocking range
The ultra steep long pass filter is a high-performance hard-coated filter with high transmission rates and a wide blocking range. It features a steep edge transition (less than 0.5% of the laser wavelength) at a specific wavelength, allowing it to transmit longer wavelengths while reflecting shorter wavelengths, enabling spectral separation. In particular, in Raman spectroscopy, it is necessary to separate Rayleigh scattered light (laser wavelength) from weak Raman scattered light, and the steep edge transition and high blocking performance make it easy to measure Raman spectra.
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basic information
■ Steep cutoff (laser wavelength < 0.5%): Detectable near Rayleigh light (excitation laser wavelength) compared to notch filters ■ High blocking performance (OD > 6 (typical)) ■ High transmittance (average transmittance 90% (typical)): Can detect weak Raman scattered light ■ Incident angle 0° ■ Effective aperture 8 mm (Φ12.5 mm filter), 21 mm (Φ25 mm filter) ■ Long lifespan and high durability
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Applications/Examples of results
■ Raman spectroscopy ■ Laser excitation ■ Fluorescence measurement ■ Biophotonics ■ Microscope
Line up（29）
| Model number | overview |
|---|---|
| 442 US LPF-12.5 | Laser wavelength 442nm, 1.4nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 442 US LPF-25.0 | Laser wavelength 442nm, 1.4nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 457 US LPF-12.5 | Laser wavelength 457.9nm, 1.4nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 457 US LPF-25.0 | Laser wavelength 457.9nm, 1.4nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 476 US LPF-12.5 | Laser wavelength 476.4nm, 1.4nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 476 US LPF-25.0 | Laser wavelength 476.4nm, 1.4nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 488 US LPF-12.5 | Laser wavelength 488nm, 1.4nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 488 US LPF-25.0 | Laser wavelength 488nm, 1.4nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 514.5 US LPF-12.5 | Laser wavelength 514.5nm, 1.6nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 514.5 US LPF-25.0 | Laser wavelength 514.5nm, 1.6nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 532 US LPF-12.5 | Laser wavelength 532nm, 1.7nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 532 US LPF-25.0 | Laser wavelength 532nm, 1.7nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 632.8 US LPF-12.5 | Laser wavelength 632.8nm, 2.0nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 632.8 US LPF-25.0 | Laser wavelength 632.8nm, 2.0nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 638 US LPF-12.5 | Laser wavelength 638nm, 2.4nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 638 US LPF-25.0 | Laser wavelength 638nm, 2.4nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 650 US LPF-12.5 | Laser wavelength 650nm, 2.1nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 650 US LPF-25.0 | Laser wavelength 650nm, 2.1nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 660 US LPF-25.0 | Laser wavelength 660nm, 2.1nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 676 US LPF-12.5 | Laser wavelength 676.6nm, 2.3nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 676 US LPF-25.0 | Laser wavelength 676.6nm, 2.3nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 752 US LPF-12.5 | Laser wavelength 752.5nm, 2.3nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 752 US LPF-25.0 | Laser wavelength 752.5nm, 2.3nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 785 US LPF-12.5 | Laser wavelength 785nm, 2.5nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 785 US LPF-25.0 | Laser wavelength 785nm, 2.5nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 830 US LPF-12.5 | Laser wavelength 830nm, 3.6nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 830 US LPF-25.0 | Laser wavelength 830nm, 3.6nm (at 6 OD ~ 50% transmission), Φ25nm size |
| 1064 US LPF-12.5 | Laser wavelength 1064nm, 6.3nm (at 6 OD ~ 50% transmission), Φ12.5nm size |
| 1064 US LPF-25.0 | Laser wavelength 1064nm, 6.3nm (at 6 OD ~ 50% transmission), Φ25nm size |
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We are a group of experts specializing in spectroscopy, focusing on cutting-edge equipment such as light sources, spectrometers, detectors, our unique laser measurement systems, analytical devices, and femtosecond laser processing.