OtO Photonics' RedBullet (RB) series are a new generation of ultra-compact Czerny-Turner cavity spectrometers featuring a single concave mirror in place of separate collimator and focussing mirror components.
This innovative arrangement provides the sensitivity and resolution benefits of a Czerny-Turner cavity design in an extremely compact form-factor with an overall size (including connectors and control boards) of only 51.4mm x 36.4mm x 29mm (~54cm³ ).
Despite its compact form-factor SilverBullet features an extremely rigid optical bench ensuring a platform with excellent thermal, humidity, shock and vibration stability.
RedBullet is currently available with a choice of two linear InGaAs sensors - 128-pixel (RB4524) and 256-pixel (RB4564). In 2024 OtO Photonics will be releasing a thermoelectrically cooled model, GoldenBullet, which will be the world's smallest TE-cooled NIR spectrometer.
All Bullet-series micro spectrometers feature 8-bit 8051 microcontrollers providing high optical resolution and sensitivity along with short integration time, fast readout speed, high accuracy trigger timing and low power consumption.
| Description | RB4524 | RB4564 |
| Sensor | Hamamatsu G8160 128 Pixel InGaAs |
Hamamatsu G8160 256 Pixel InGaAs |
| Dark Noise |
<14 (High Gain) <10 (Low Gain) |
<12 (High Gain) <10 (Low Gain) |
| Dynamic Range |
6250 (High Gain) 7200 (Low Gain) |
6500 (High Gain) 9500 (Low Gain) |
| SNR |
2000 (High Gain) 6000 (Low Gain) |
3000 (High Gain)
6700 (Low Gain) |
| Integration Time | 6µs to 24s | |
| Optical Parameters | f/#: 4.5 NA: 0.11 |
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| Dimensions | 51.4 x 36.4 x 29 mm | |
The two RedBullet models can be specified with a full spectral range of 900nm to 1700nm using a 253.53 grooves/mm grating blazed at 1300nm. This configuration gives FWHM Resolution from 7nm to 30 nm, depending on the choice of sensor and slit width.
The 256-pixel RB4564 is also offered with a 360g/mm, 1000nm grating giving a reduced spectral range of 900-1400nm and FWHM resolution of 6.1nm (typical) with 25µm slit width. Full details are shown below:-
| Model | Code | Grating Groove Density |
Grating Blaze Wavelength |
Spectral Range (nm) |
Resolution (nm, FWHM) |
|||
| 25µm | 50µm | 100µm | 200µm | |||||
| RB4524 | NIRC3 | 293.53/mm | 1300nm | 900-1700 | ~ | 10.4 <16.2 |
18.2 <21.8 |
30.3 |
| RB4564 | NIRC3 | 293.53/mm | 1300nm | 900-1700 |
7.2 <9.9 |
10.4 <12 |
15.5 | 30.3 |
| RB4564 | ~ | 360/mm | 1000nm | 900-1400 | 6.1 <8.3 |
~ | ~ | ~ |
Over time we expect additional grating and slit width options to become available with application-specific spectral range, sensitivity and resolution characteristics. Please feel free to discuss your application's needs to see if we can match to existing configurations or develop an optimised solution.
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RedBullet product brief |
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RedBullet data sheet |
Power and communication with RB-Series spectrometers is via high-speed micro-USB with the addition of 6 user-programmable digital I/Os.
The inclusion of OtO's SpectraSmart software ensures that RedBullet users can be up-and-running within minutes whilst the availability of a Software Development Kit for Windows and example code for Linux facilitates integration into a broad range of OEM instruments.
For more information on RedBullet and the forthcoming GoldBullet TE-cooled NIR microspectrometer please Contact Us to discuss your application.
