金膜脉冲压缩母光栅

 查阅光栅目录

衍射光栅广泛用于激光啁啾脉冲放大系统中的脉冲压缩。高衍射效率,高波前质量和高损伤阈值是这类光栅最基本的要求。

HORIBA Jobin Yvon引领是采用全息技术设计、开发脉冲压缩光栅的先行者。细致地设计光栅刻槽参数,镀金膜脉冲压缩光栅在800nm1.053 µm处衍射效率可达94%。除此以外,全息制造技术可以制造超大光栅,具有好的稳定性和衍射波前质量。

脉冲压缩母光栅

CPA 激光需要高性能的光学性能和高损伤阈值,采用镀金膜全息光栅能确保性能。母光栅是一种制造大面积光栅的突出技术,HORIBA Jobin Yvon有多种标准尺寸可供选择,最高达210x420 mm。标准刻槽密度有120014801740,2000g/mm,适用于800nm1053nm。定制尺寸最高可达500x500mm,亦可按要求定制其它刻槽密度,非标准波长优化,和/或更大的光栅尺寸。

特性

  • 优化的全息刻划 

  • 镀金膜

  •  高抛光原材料

  • 多种尺寸和刻槽密度的标准及定制光栅可供选择

优点

  • 高衍射效率,小化光吸收

  • 高损伤阈值

  • 维持波前质量

  • 可匹配于您压缩和脉冲能量要求

Guaranteed specifications:

  • Efficiency:
    90% average absolute efficiency at 800 nm or 1053 nm in near-Littrow configuration (10° deviation angle between the incident and diffracted beams).
  • Wavefront quality:
    better than l/4 at 800 nm or at 1 053 nm in the -1 diffracted order..

Ordering information:

  • Five standard groove densities
  • Eight standard sizes
  • Optical coating: gold (included)

Delivered documentation with master pulse compression gratings

For large gratings (165x220 mm and larger):

  • Absolute efficiency, measured in nine spots distributed over the clear aperture of the grating
  • Interferograms of -1 order and 0-order wavefronts
  • A certificate of conformity

For small gratings:

  • Absolute efficiency, measured in the center of the grating
  • Quality of the -1 order diffracted wavefront
  • A certificate of conformity

Typical Holographic Master Efficiencies for Pulse Compression

1200 g/mm, 800 nm, Deviation=10°, TM, Au coating
1200 g/mm, 1050 nm, Deviation=10°, TM, Au coating
1480 g/mm, 1050 nm, Deviation=10°, TM, Au coating
1740 g/mm, 1050 nm, Deviation=10°, TM, Au coating
1200 g/mm, 1050 nm, Deviation=10°, TM, Au coating
1480 g/mm, 800 nm, Deviation=10°, TM, Au coating
1740 g/mm, 800 nm, Deviation=10°, TM, Au coating
2000 g/mm, 800 nm, Deviation=10°, TM, Au coating

Diffraction efficiency according to incident angle:

1200 gr/mm, 750nm and 800 nm, variable incidence, TM, Au coating, Littrow angle = 28.7° at 800 nm

The efficiency can vary significantly depending upon the usage geometry.

Efficiency values depend primarily on deviation angle (angle between incident beam and diffracted beam). In general, if deviation angle does not exceed 15°, the efficiency and bandpass remain stable, if deviation angle exceeds 15°, a careful evaluation is necessary (see 1200 gr/mm grating variable incidence efficiency curve example).
For the same deviation angle, bandpass depends on the incidence angle being smaller or larger than the Littrow angle (less or more grazing incidence angle). In general more grazing incidence angle is more favourable for the bandpass.