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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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High-dispersive mirrors for high power applications.

V Pervak¹, O Pronin, O Razskazovskaya

¹Ludwig-Maximilians-Universitaet Muenchen, Am Coulombwall 1,85748 Garching, Germany. vladimir.pervak@physik.uni-muenchen.de

|March 16, 2012

Summary

Researchers developed high-dispersive mirrors (HDM) with record group delay dispersion (GDD) up to -4000 fs2. These mirrors achieve high reflectance and enable the generation of 200-fs pulses in advanced laser systems.

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Area of Science:

Optics and Photonics
Laser Technology
Materials Science

Background:

High-dispersive mirrors (HDMs) are crucial components for ultrafast laser systems, enabling precise control over optical dispersion.
Achieving large group delay dispersion (GDD) values while maintaining high reflectance is a key challenge in HDM development.
Existing HDMs often have limitations in dispersion magnitude or operational bandwidth, restricting their application in high-power ultrafast lasers.

Purpose of the Study:

To develop and manufacture novel high-dispersive mirrors (HDMs) with enhanced group delay dispersion (GDD) capabilities.
To achieve record GDD values for applications in ultrafast laser systems.
To demonstrate the effectiveness of the developed HDMs in a practical laser setup.

Main Methods:

Fabrication of two types of high-dispersive mirrors (HDMs) using advanced coating techniques.
Characterization of mirror reflectance and group delay dispersion (GDD) over specific wavelength ranges.
Integration of the second type of HDM into a Kerr-lens mode-locked Yb:YAG thin-disk oscillator.

Main Results:

Development of HDMs with GDD values of -4000 fs2 (1027-1033 nm) and -3000 fs2 (1020-1040 nm).
Achieved reflectance of >99.9% for both types of fabricated mirrors, suitable for intracavity use.
Successful generation of 200-femtosecond (fs) pulses with multi-10-watt average power using the developed HDMs in a Yb:YAG thin-disk laser.

Conclusions:

The developed HDMs offer record GDD values and high reflectance, making them suitable for demanding intracavity laser applications.
The successful implementation in a Yb:YAG thin-disk oscillator demonstrates their capability for generating high-power, ultrashort laser pulses.
These advancements in HDM technology pave the way for more powerful and efficient ultrafast laser systems.