LPNIRB050-MP2

• Broad operating wavelength range: 650–1100 nm.
• High extinction ratio: >200:1 across the full operating wavelength range.
• Very high extinction ratio: >1000:1 from 695–1100 nm.
• SM05-mounted design for convenient integration into Thorlabs' SM05-threaded optical systems.
• Ø1/2" (12.7 mm) optic housed in a compact mount.
• Ø10.9 mm clear aperture for efficient transmission of the incident beam.
• High angular precision: optical parallelism of <20 arcmin.
• Suitable for both visible and near-infrared polarization applications.
• Designed for applications requiring reliable linear polarization with a compact, easily mountable format.
• Compatible with a wide range of Thorlabs optical mounts and cage-system components.

The Thorlabs LPNIRB050-MP2 is an SM05-mounted linear polarizer designed for controlling and analyzing the polarization state of light over the 650–1100 nm wavelength range.

This polarizer uses a nanoparticle-based polarizing element and is permanently mounted inside an SM05-threaded housing, providing a compact and convenient solution for integration into free-space optical systems.

The polarizer maintains an extinction ratio of at least 200:1 across its full operating bandwidth, while an extinction ratio greater than 1000:1 is maintained from 695 to 1100 nm. A high extinction ratio indicates strong discrimination between the desired polarization state and its orthogonal component, making the polarizer suitable for precision polarization control and measurement.

The optic has a 0.55 ± 0.1 mm thickness and a 10.9 mm clear aperture. Its SM05 housing provides external SM05 (0.535"-40) series threads, allowing straightforward integration with compatible Thorlabs optomechanical components.

The LPNIRB050-MP2 is also suitable for applications involving high-quality polarization control in laser and nonlinear optical systems. For example, it has been used in optical microscopy and nonlinear imaging systems to measure and control the polarization state of laser light.

Product Type: Linear Polarizer
Part Number: LPNIRB050-MP2
Polarizer Type: Nanoparticle Linear Polarizer
Wavelength Range: 650–1100 nm
Optic Diameter: 12.7 mm (Ø1/2")
Housing Diameter: 17.8 mm (0.70")
Clear Aperture: Ø10.9 mm (0.43")
Extinction Ratio: >200:1 @ 650–1100 nm
Extinction Ratio: >1000:1 @ 695–1100 nm
Optic Thickness: 0.55 ± 0.10 mm
Optical Parallelism: <20 arcmin
Acceptance Angle: ±20°
Operating Temperature: -20 to +120 °C
Surface Quality: 40-20 Scratch-Dig
Mounting Thread: SM05 (0.535"-40)
Mounting: Permanently mounted; the optic is not removable.
CW Laser Damage Threshold: 10 W/cm² Continuous Block; 25 W/cm² Continuous Pass
Pulsed Laser Damage Threshold: 0.006 J/cm² @ 800 nm, 100 Hz, 36.4 fs, Ø189 µm; 0.1 J/cm² @ 810 nm, 7.2 ns, 10 Hz, Ø0.216 mm

The extinction ratio specification describes the ratio between maximum transmission when the polarizer axis is aligned with a linearly polarized input and minimum transmission when the polarizer is rotated by 90°.

The LPNIRB050-MP2 is suitable for a variety of polarization-control and photonics applications, including:

• Laser Polarization Control
• Polarization Analysis
• Near-IR Optical Systems
• Visible/NIR Laser Systems
• Microscopy
• Nonlinear Optical Imaging
• Spectroscopy
• Interferometry
• Optical Metrology
• Laser Beam Characterization
• Polarization Extinction Ratio Measurements
• Free-Space Optical Systems
• Quantum Optics Experiments
• Scientific and Research Optical Setups

Its combination of 650–1100 nm wavelength coverage, high extinction ratio, and compact SM05 mounting makes the LPNIRB050-MP2 particularly useful for experiments where precise control or measurement of linear polarization is required. It can also be combined with wave plates and other polarization optics to build complete polarization-control systems.