SureLock™ 638nm Wavelength Stabilized Laser Diode

Ondax’s 638nm Wavelength Stabilized Laser Diode is a single mode, single frequency laser in an ultra-compact TO-can footprint. The extremely narrow linewidth, broad temperature operating characteristics and low power consumption deliver affordable, portable instrument-quality performance for a broad range of instrumentation applications.All SureLock™ Series lasers are stabilized using the Ondax PowerLocker® Volume Holographic Grating, ensuring precise, ultra-stable center wavelengths, low temperature dependence and consistent optical performance over the locked region.

TO Series Wavelength Stabilized TO Can Lasers


  • Single frequency performance
  • Narrow linewidth <300MHz
  • Wavelength stability <0.015nm/°C
  • Coherence length 0.5m
  • Compact, hermetically sealed TO footprint
  • Narrow-band ASE filters available


  • Raman Spectroscopy
  • HeNe Replacement
  • Metrology
  • Sensing
  • Bio-instrumentation
  • Analytical Instrumentation
  • Graphic Arts
SureLock™ Specifications
Parameter Symbol Min Typ Max Unit
Output Power Po 32 mW
Center Wavelength1 LP 637 638 639 nm
639 640 641 nm
Linewidth Δλ 300 MHz
Central Stabilized Temperature Tc 15 45 °C
Stabilized Temperature Range Tr 10 14 °C
SureLock™ Operating Specifications
Parameter Symbol Min Typ Max Unit
Threshold Current Ith 45 60 mA
Operating Current Iop 70 100 mA
Operating Voltage Vop 2.4 2.6 V
Laser Reverse Voltage Vrl 2 V
Monitoring Output Current Im 0.07 0.15 0.2 MA
Beam Divergence, Perpendicular Qv 16 21 24 Degrees
Beam Divergence, Parallel Qh 7 10 13 Degrees
Off Axis Angle, Perpendicular dQv Degrees
Off Axis Angle, Parallel dQh Degrees
Emitter Size 1 x 2 µm
Differential Efficiency DE (dP/dI) 1 mW/mA
Operating Temperature2 Top -10 50 °C
Storage Temperature2 Ts -40 80 °C
Polarization 60:1
Polarization Orientation TM