THORLABS NEL04A/M Noise Eaters (1050 - 1620 nm, M4 Taps)

Wavelength Range: 1050 - 1620 nm

Switchable High Power Mode: Yes

Noise Attenuation Performance Specs

Output Power Stability(a): ±0.05% (RMS)

Noise Attenuation Frequency Range(b): DC - 1.4 kHz

Noise Attenuation Amplitude Range: 0.1% to 50% of Input Signal

Noise Attenuation Factor(c): >150 at 10 Hz, 80 at 60 Hz . 10 at 400 Hz, 1.5 at 1 kHz

Effective Output Power Attenuation Range(d): 1 - 5

Internal Polarizer Blocking DamageThreshold (Maximum Power Attenuation): 10 W/cm^2

Attenuation Control: Onboard Potentiometer (10 Turns) or SMA Modulation Input

Optical Specs

Transmission: >85% at 1550 nm

Power Level Switching: High/Low Power Mode Switch and Four Position Power Range Switch

Minimum Input Power: 0.5 mW

Polarization Extinction Ratio at Output: >1000:1 Over Wavelength Range

Damage Threshold (CW)(e): 8 W/cm^2

Input Aperture: Ø5 mm

Input Beam Diameter(f): Ø4 mm (Max)

Output Beam Displacement: 1 mm Vertically (in the Direction of Input Polarization)

Beam Divergence: 5 mrad (Max)

Angle of Incidence: ±2° (Max)

Input Polarization Tolerance: ±3°

Wavefront Distortion: ≤λ/2 at 635 nm

AR Coating: Ravg <0.5% from 1050 - 1620 nm

Modulation Performance Specs

Modulation Input: SMA Connector, 0 - 2.5 V, 10 kΩ Input Impedance

Extinction Ratiog: 6.5

Minimum Rise / Fall Time(h): 2.8 ms / 25 ms

Pulsed Laser Input Repetition Rate: >1 MHz

General Specs

Mounting Options

- Two 8-32 (M4) Tapped Holes for Post Mounting

- 30 mm Cage System Compatible via Eight 4-40 Tapped Holes

- Ø1" Lens Tube Compatible via 4 mm Deep Internal SM1 Threads on Rear Side

Operating Temperature Range: 15°C to 45°C

(a) RMS value over 8 hours.

(b) The maximum of the frequency range is defined as the point where 0 dB noise attenuation is obtained. These noise eaters are designed to operate down to DC frequency. However, due to external factors (e.g. ambient temperature, vibration, spatial and/or polarization stability of the light source), the noise attenuation factor below 10 Hz is difficult to measure and quantify. Therefore our specifications are guaranteed at 10 Hz and above.

(c) Noise attenuation factor is the ratio of noise amplitude before and after the noise eater. It was tested at 3 mW input power with a noise amplitude of 5% of the input power level. See detailed noise attenuation plots on the Performance manual.

(d) This is the range of output power adjustment where the noise attenuation factor is guaranteed for a given input power level. If the output power is further reduced, the noise eater might not be able to completely reduce the noise in the signal. This specification does not include losses due to absorption.

(e) The maximum input power density and laser damage threshold are wavelength-independent. Additionally, the absolute maximum input power varies with wavelength; see the manual.

(f) Specified for a 1/e2 beam diameter.

(g) Extinction ratio is the ratio of the signal power at minimum attenuation to the signal power at full attenuation, regardless of the effective noise attenuation factor, when using the SMA modulation input.

(h) Rise time is measured on the rising edge of the output intensity from 10% to 90% of full output power.

MANUAL: