Case Study: 1000 nm Long Pass Filter

Data Table

Specification

Value

50% T%

1000 nm +/- 10 nm

Transmission Range

1020 – 2000 nm

Blocking Range

300 – 970 nm

Peak Transmission %

T% >90%

Substrate

RG 850

Dimensions

5 X 5 mm

Thickness

3 mm

Scratch/Dig

60/40

Quantity Per Year

2000

Case Study: Low Pass Band Ripple Filters for Mini Spectrometers

 

Customer Challenge A manufacturer of mini spectrometers required an order sorting filter, a steep, long pass filter with low ‘passband ripple’. The filter that was previously used, showed peak to trough variations of +/-6% leading to compromised results and reduced accuracy in spectral analysis (see Fig 1).

Vortex’s Solution: Initially our response was to design and manufacture a small sample batch of a low ripple long pass filters with less than 2% ripple for customer testing (see Fig 2). This allowed our customer to determine if it had made any improvements to their system performance.  The flat band transmission profile was achieved with a computer refined design combined with our accurate in-house deposition monitoring, the result can be seen in Figs 1 and 2 which compares the previous filter with the one Vortex provided.

Result: The low ripple, long pass filter samples were a great success and greatly improved the mini spectrometers accuracy. On the back of this, we worked closely with the customer to rewrite the old specification to include these new key points to avoid any future issues. The successful collaboration with Vortex not only resolved the immediate issues but also positioned the customer to expand their market reach, as their spectrometer became a more competitive option in the high-precision measurement sector.