Newport's VA-BB series of broadband ultrafast variable attenuators provide continuous attenuation over a series of broad wavelength ranges. The VA-BB series is designed to provide high attenuation of linearly polarized fundamental and harmonic frequencies of light for most ultrafast oscillators.
High contrast attenuation (1000:1)
Minimal stretching for ultrafast pulses > 70 fs
Adjustable intensity of transmitted P-polarized output
Additional drawings are not available for this product.
Specifications
Attenuation Range
Tp > 92%, polarized input, with broadband AR coating (VA-BB-4: Tp > 85%, polarized input, with uncoated polarizer)
Extinction Ratio
Tp/Ts > 500:1, 1000:1 average
Damage Threshold
500 W/cm2 CW, 2 J/cm2 with 8 nsec pulses at 1064 nm, typical
Clear Aperture
10 mm
Features
Manual Broadband Ultrafast Variable Attenuators
The manual versions of the VA-BB series come with a manual rotary stage containing the half-waveplate. The user manually rotates the stage to control attenuation.
The motorized versions of the VA-BB series come with a motorized rotary stage containing the half-waveplate. Software is included which allows the user to calibrate the VA-BB at a single wavelength. The motorized version can be used in open- or closed-loop operation.
Motorized, Variable Beam Splitter (Post and post holder sold separately)
Compact Industrial Housing
The optics and high-precision opto-mechanics are incorporated into a compact housing, flexibly designed for post mounting at varying optical axis heights. P-polarized light is transmitted with minimal loss collinear to the input beam path while S-polarized light is rejected into a beam dump on the side of the housing. M-4 and 8-32 threads are included on the bottom and one side of the housing for mounting on optical posts. This allows for horizontally or vertically polarized output.
The VA-BB series is based on zero-order half-waveplates and Glan-laser polarizers. For more detail on the principle of operation of these devices, please refer to our Variable Attenuator for Lasers application note. These attenuators are designed to handle average powers up to 100 Watts for wavelength ranges of 400-700 nm, 690-1040 nm, 650-1350 nm or 1000-1600 nm.
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