SureBlock™ Ultra Narrow-Band VBG Notch Filters
Overview
SureBlock™ Ultra Narrow-Band Notch Filters (reflective VBG): OD > 4 at laser line (>99.99% attenuation), spectral transition width < 10cm⁻¹, high transmission on both sides for simultaneous Stokes & Anti-Stokes, standard wavelengths 488/514/532/633/785nm for low frequency/THz-Raman spectroscopy.Description
Overview
SureBlock™ ultra narrow-band notch filters are reflective Volume Holographic Gratings (VHGs) designed for highly selective wavelength applications like low frequency/THz-Raman spectroscopy. With laser line attenuation greater than 99.99% (OD 4) and spectral transition width of <10cm⁻¹, they dramatically improve the ability of any Raman system to resolve low frequency Raman scattering. High transmittance on both sides of the notch enables simultaneous observation of Stokes and anti-Stokes Raman spectra, nearly doubling the available signal in the THz range.
Features
- Ultra narrow, OD4+ rejection bandwidth
- Highly repeatable performance
- Access to both Stokes and Anti-Stokes Raman
- Environmentally stable at high temperature and humidity
- No degradation over time, even under high power illumination
- Standard wavelengths 488/514/532/633/785nm; custom available
Applications
- Low Frequency / THz-Raman Spectroscopy
- Structural studies of nanomaterials
- Increased SNR / faster Raman imaging by combining Stokes and Anti-Stokes
- Spatial temperature mapping in solid, fluid and gaseous media
- Biomedical and solid-state laser systems
- Wide-band notch filter replacement
【Contact】
17317958112
Specifications
| Type | SureBlock™ Ultra Narrow-Band Notch Filter (reflective VBG) |
| Standard Wavelengths | 488 / 514 / 532 / 633 / 785nm (custom available) |
| Spectral Transition Width | <10cm⁻¹ (center to 50% transmission) |
| Optical Density at Laser Line | >4 (>99.99% attenuation) |
| Typical Transmission | 60% (488) / 65% (514) / 70% (532) / 80% (633) / 90% (785) |
| Free Space Aperture | Standard 9mm in 1" mount; custom sizes available |
| Dual-side Access | High transmission on both sides for simultaneous Stokes & Anti-Stokes |
| Environmental Stability | Stable at high temperature & humidity; no degradation under high power |
Technical Data
SureBlock™ 超窄带陷波滤波器 规格参数表
| 参数 | 488nm | 514nm | 532nm | 633nm | 785nm |
|---|---|---|---|---|---|
| 光谱过渡宽度（中心到 50% 透射） | <10cm⁻¹ | ||||
| 激光线光密度（单只） | >4 | ||||
| 典型透过率（单只） | 60% | 65% | 70% | 80% | 90% |
| 通光孔径 | 标准 9mm（1" 安装座内），可定制尺寸 | ||||
超窄陷波过渡（中心到 50% 透射）曲线
陷波两侧高透过，支持 Stokes 与 Anti-Stokes 同时测量
超低频拉曼光谱：硫磺（Sulfur）光谱同时显示 Stokes 与 Anti-Stokes 信号，瑞利散射强抑制；L-Cystine 实测在 10cm⁻¹ 附近可见清晰峰
建议搭配：SureLock™/CleanLine™ 波长稳定激光 + NoiseBlock™ 分束器 + NoiseBlock™ ASE 滤波片，构建紧凑型超低频拉曼光谱系统