http://www.jinstartech.com/

General Attributes:

Thorlabs PNA1 very good price

Intensity Noise Analyzer, USB Powered 

• Low Quiescent Noise Floor: <-140 dBV²/Hz
• Onboard Calculation of the Relative Intensity Noise
• Powered and Controlled via USB 2.0
• 9 Hz Minimum Resolution Bandwidth for Resolving Low-Frequency Noise Sources

Application Idea

A typical optical setup for frequency-domain measurements. The output of the DET10A2 silicon detector is connected to the PNA1 noise analyzer using a BNC cable (Item # 2249-C-24). The PNA1 is powered via USB 2.0 and operated with the Intensity Noise Analyzer Software.

Features

• High-Precision, Low-Noise Intensity Noise Analyzer for Frequencies Up to 3 MHz
• Multiple Sample Rates for Optimized Resolution Bandwidth (See Table 1.1)
• Input Voltage Range: ±3.85 V 
• BNC Signal Input, Internally Terminated with a 10 kΩ Impedance
• Operated with Intensity Noise Analyzer Software (See Software Tab for Software Download)
  • Displays Data in Frequency or Time Domain
  • Frequency-Domain Readout with Power Spectral Density or Relative Intensity Noise (RIN) Units 
  • Calculates the Total Integrated Relative Intensity Noise (IRIN)
  • Requires a User-Supplied Computer (See Software Tab for Details)

Applications

• Laser Relative Intensity Noise Characterization
• Detection of Noise in Optical Setups (Acoustic Noise, Electrical Noise, Vibration Noise)
• Determining Best Frequencies for Lock-In Detection
• CARS, SRS, or Transient Absorption System Diagnostics
• Error Signal Frequency-Domain Optimization (PID Parameters)
• Spectral Analysis of Laboratory Voltage or Current Signals
• Photonic Integrated Circuit (PIC) Noise Analysis (See PIC Testing Demo Tab for Details)