PowerLocker® Wavelength Stabilization Gratings

Coherent’s PowerLocker wavelength stabilization gratings are volume holographic gratings (VHGs, also known as Volume Bragg Gratings, or VBGs) that lock a laser diode’s emission wavelength into a narrowed optical spectrum. This increases the spectral brightness and delivers highly stabilized optical performance over extended temperature ranges. PowerLockers typically reduce the spectral output of a laser by an order of magnitude. The short external cavity configurations enabled by the PowerLocker design deliver better mode selection than systems based on Littrow or Littman cavities, at a fraction of the size and cost.

All Coherent VHGs are bulk solid-state diffractive holographic filters made from a proprietary photosensitive optical glass, which unlike thin films or gels, can deliver ultra-stable, degradation free performance over an unlimited lifetime. Capable of very tight wavelength, efficiency, bandwidth, and diffraction angle control, Coherent VHGs can be precisely and reproducibly engineered to meet even the most demanding spectral and temporal specifications.

Parameter Min Typical Max Unit
Center Wavelength 369 405, 658, 780.25, 785, 794.7, 808, 88X, 920, 938, 976, 98X, 1064, 1532, C-band 2700 nm
Wavelength Tolerance1 -0.5 +0.5 nm
Wavelength Variation (within filter) 0.2 nm
Bandwidth2 (FWHM) 0.03 1 nm
Temperature Dependence 0.01 nm/˚C
Bragg Mirror Reflectivity 5 10-98 >99.9 %
Reflectivity Tolerance1 -5 +5 %
Grating Slant Angle <1 (Custom Available) degs
Standard Dimensions (X,Y) 0.5 25 mm
Thickness 0.3 0.6-3 30 mm

PowerLocker Operating Specifications
1Tighter tolerances available

2Grating bandwidth is a function of wavelength and thickness



Medical Imaging
Wavelength Stabilization
Notch and ASE Filters
Beam Combining
Rb/Atomic Laser pumping
Pulse Stretching and Compression
Augmented Reality (AR)

Features & Benefits

  • Increases spectral brightness of lasers
  • Reduces thermal dependence of lasers
  • Reduces unwanted spectral components
  • Ultra-narrow bandwidth
  • Low loss
  • Highly stable and reliable
  • Over 30,000 hours of testing at >200°C
  • No degradation under high power illumination conditions

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