Coherent’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.
|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|
|Diffraction Efficiency||>90 (>70% for 405 nm)||%|
|Total Deflection Angle||2Θ||8-12||Degrees|
|Clear Aperture Diameter||4.5 mm in 1/2″ mount. Custom sizes available.||25||nm|
1Grating bandwidth is a function of wavelength and thickness