BAC100B Raman Probe

Significance of the Topic

The BAC100B Raman probe provides a flexible, contamination-minimizing interface for in situ Raman analysis with portable spectrometers. Its ability to bring the probe directly to the sample surface enhances field and laboratory measurements by simplifying sample handling and ensuring consistent focusing across various sample types.

Objectives and Study Overview

This document presents an overview of the design and capabilities of the BAC100B series Raman probe, highlighting its adaptability for low-frequency Raman shifts, high throughput models, and immersion measurements under challenging environmental conditions.

Methodology and Instrumentation

• Optical configuration achieves Raman shifts down to 65 cm-1 for 532 and 785 nm versions, and 100 cm-1 for 1064 nm.
• Excitation fiber: 105 μm core diameter, FC/PC connector.
• Collection fibers: 200 μm core with SMA 905 (standard) or 300 μm core with FC/PC (high throughput).
• Probe shaft: 304 stainless steel with flat quartz window; spot size approximately 85 μm.
• Optional shafts for immersion measurements: O-ring sealed fused silica or sapphire windows (unpressurized) and high-pressure/temperature RIS101 shafts.
• Standard fiber assembly: 1.5 m PVC-jacketed flexible cable with internal support.

Main Findings and Discussion

The BAC100B probe demonstrates stable long-term performance under ambient conditions up to 80°C. The detachable distance regulator ensures reproducible working distances (5.4–5.9 mm depending on wavelength), minimizing signal variability. High throughput configurations significantly increase collection efficiency, enhancing sensitivity for low-concentration analytes and low-frequency Raman modes.

Benefits and Practical Applications

• Portable, on-site Raman measurements for pharmaceuticals, chemicals, and environmental samples.
• Low-frequency detection supports material characterization, crystal polymorphism, and molecular fingerprinting.
• Customizable shaft dimensions and materials adapt to specific sampling environments, including immersion in liquids.
• Simple fiber coupling and user-replaceable shafts reduce maintenance downtime.

Future Trends and Opportunities

Advancements may include integration with fiber-coupled lasers at additional wavelengths, enhanced miniaturization of probe heads, and implementation of active temperature control to broaden operating ranges. Development of gold-coated or chemically resistant shafts can expand applications to harsh chemical environments.

Conclusion

The BAC100B Raman probe series offers a robust, adaptable solution for field and laboratory Raman spectroscopy. Its optimized optical design, flexible configuration options, and durable construction make it suitable for diverse analytical challenges, particularly where low-frequency Raman shifts and high throughput are required.

References

• B W Tek LLC. BAC100B Raman Probe Technical Datasheet, Doc-Rev: 280001299-A (2021)