NoiseBlock™ ASEYZ光栅

Ondax’s NoiseBlock ASE (Amplified Spontaneous Emission) filters suppress the broad spectrum of spontaneous emission from laser diodes to provide a pure, ASE-free, single frequency laser.

The ASE Filter is a reflective Volume Holographic Grating (VHG) with typical bandwidth of less than 150pm and throughput greater than 90%. The VHG is purposely manufactured with a slant that provides an angular separation between the specular reflections from the surface of the VHG and the filtered laser beam.

NoiseBlock filters also make excellent 90/10 beamsplitters by reflecting 90% of incoming single frequency light at a specified angle and transmitting the remaining 10%.

主要特点

• High transmittance at design wavelength
• Greater than 40dB reduction in broad ASE spectral background
• Narrow spectral bandwidth
• Customizable slant angle for angular separation of beams
• Fiber coupled input/output available
• Environmentally stable at high temperature and humidity with over 12,000 hours of testing at 150°C
• No degradation under high power illumination conditions:
• > several kW/cm²average power
• > 170MW/cm²peak power (fluence of 3.8 J/cm²) at 1064nm