SS-OCT System Planner

Laser Spectral Parameters

Center Wavelength

nm

Center Optical Frequency

nm

228.85

THz

Total Tuning Range (Bandwidth)

nm

-

THz

Lower Wavelength ^*

1255.0

nm

219.57

THz

Upper Wavelength ^*

1365.0

nm

238.85

THz

Percentage of Tuning Range Sampled

%

Typically use 90 to 93%

Sampled Tuning Range (Bandwidth)

99.0

nm

17.37

THz

Sampled Lower Wavelength

1260.5

nm

220.39

THz

Sampled Upper Wavelength

1359.5

nm

237.76

THz

^* Lower and Upper Wavelengths are not necessarily Start and Stop Wavelengths; some lasers sweep down from Upper-to-Lower.

Timing Parameters

Laser Sweep Rate (A-scan Rate)

kHz

Laser Sweep Period

10.00

μs

Duty Cycle (Percentage Sampled)

%

Uni-directional tuning uses 45 to 50%

Sampled Period

4.50

μs

Laser Sweep Deviation Above Linear

%

Laser sweep is chirped, typically 15 to 25%

Laser Sweep Deviation Below Linear

%

Laser sweep is chirped, typically 45 to 60%

Max OCT Interference Frequency at Full Range

-

MHz

Minimum Nyquist frequency of ADC

OCT Axial Resolution (FWHM)

Window Multiplier (e.g., Hann = 0.6)

-

Resolution in Air

10.37

μm

Resolution in Medium

7.41

μm

Theoretical best-case: assumes dispersion and clock delay compensated and no other irregularities.
Window functions are typically used to reduce the presence of sidelobes but at a cost of some resolution.

Target Scan Parameters

Target OCT Scan Depth (Ranging/Image Depth)

mm, in air

Medium Refractive Index (n)

-

OCT Scan Depth in Medium

3.57

mm

K-Clock & Sampling

Direct Clocking

Digital Resampling

K-Clock MZI optical path length delay (OPLD)

-

mm, in air

-

mm, in air

K-Clock MZI OPLD in fiber (n=1.466)

-

mm, in fiber

-

mm, in fiber

K-Clock FSR

-

GHz

-

GHz

K-Clock Pulse Count

-

clocks

-

clocks

Average K-Clock Frequency

-

MHz

-

MHz

Min K-Clock Frequency

-

MHz

-

MHz

Max K-Clock Frequency

-

MHz

Spectral Range Between Resampled Samples

-

GHz

Resampled Sample Count

-

samples

Resampling Phase Multiplier

-

x

ADC Sample Rate

MS/s

ADC Sample Count

-

samples