TO Series Wavelength Stabilized TO Can Series
TO Series Wavelength Stabilized TO Can Series

SureLock™ 638 nm Wavelength Stabilized Laser Diode

Coherent’s 638 nm 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 Coherent PowerLocker® Volume Holographic Grating, ensuring precise, ultra-stable center wavelengths, low temperature dependence, and consistent optical performance over the locked region.

638 nm Single Mode, Single-Frequency

TO-Can Laser for Instrumentation

Specification Summary

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™ Specifications

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

SureLock™ Operating Specifications



• Raman Spectroscopy
• HeNe Replacement
• Metrology
• Sensing
• Bio-instrumentation
• Analytical Instrumentation
• Graphic Arts

Features & Benefits

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

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