NoiseBlock™ ASE Suppression Filter噪声滤波器
Ondax’s NoiseBlock™ ASE (Amplified Spontaneous Emission) Suppression filters suppress the broad spectrum of spontaneous emission that commonly occurs in laser diodes to provide a pure, ASE free, single frequency laser.
Adding a NoiseBlock™ ASE filter to a single frequency wavelength stabilized laser effectively reduces broadband spectral ASE background to more than 70dB below the laser line while transmitting 90% of the single frequency line. The filter’s narrow spectral profile (HWHM <10cm-1) is designed to match the SureBlock™ Ultra Narrow-band Notch Filter, making it ideal for enabling ultra-low frequency (low wavenumber) Raman spectroscopy with high signal-to-noise.
Features
High transmittance at design wavelength
Reduce typical broadband ASE levels to more than 70dB below the laser line
Narrow spectral bandwidth
Customizable slant angle for angular separation of beams
No degradation under high power illumination conditions:
Environmentally stable at high temperature and humidity with over 12,000 hours of testing at 150°C
Fiber coupled input/output available
Applications
Removal of broadband ASE, fluorescence, and unwanted laser line emission
ASE noise reduction for Raman Spectroscopy
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Center Wavelength | 405 | 488, 532, 640, 658, 685, 690, 780.25, 785, 808, 830, 976, 1064, 1500 | 488, 532, 640, 658, 685, 690, 780.25, 785, 808, 830, 976, 1064, 1500 | nm |
| Bandwidth (FWHM)1 | 0.03 | <0.15<10 | nmcm-1 | |
| Diffraction Efficiency | >90 (>70% for 405nm) | % | ||
| Temperature Dependence | 0.01 | nm/°C | ||
| Total Deflection Angle | 2Θ | 8-12 | Degrees | |
| Inter-beam Angle | γ | 2 | Degrees | |
| Clear Aperture Diameter | 4.5mm in 1/2″ mount. Custom sizes available | 25 | nm |
1Grating bandwidth is a function of wavelength and thickness
Technical Data
Principles of Operation
