Lasers, Fiber Optics, and Communications

Simple ps microchip Nd:YVO4 laser with 3.3-ps pulses at 0.2 to 1.4 MHz and single-stage amplification to the microjoule level

[+] Author Affiliations
Erdal Türkyilmaz, Daniel Kopf

Montfort Laser GmbH, Im Holderlob 6a, A-6840 Götzis, Austria

Jan Lohbreier, Christian Günther, Eva Mehner, Bernd Braun

Nuremberg Institute of Technology Georg Simon Ohm, Faculty of Applied Mathematics, Physics and Humanities, Keßlerplatz 12, 90489 Nuremberg, Germany

Harald Giessen

University of Stuttgart, 4th Physics Institute and Stuttgart Center of Photonics Engineering, Pfaffenwaldring 57, 70550 Stuttgart, Germany

Opt. Eng. 55(6), 066126 (Jun 29, 2016). doi:10.1117/1.OE.55.6.066126
History: Received February 5, 2016; Accepted June 10, 2016
Text Size: A A A

Abstract.  Commercial picosecond sources have found widespread applications. Typical system parameters are pulse widths below 20 ps, repetition rates between 0.1 and 2 MHz, and microjoule level pulse energies. Most systems are based on short pulse mode-locked oscillators, regenerative amplifiers, and pockel cells as active beam switches. In contrast, we present a completely passive system, consisting of a passively Q-switched microchip laser, a single-stage amplifier, and a pulse compressor. The Q-switched microchip laser has a 50-μm-long Nd:YVO4 gain material optically bonded to a 4.6-mm-thick undoped YVO4 crystal. It delivers pulse widths of 40 ps and repetition rates of 0.2 to 1.4 MHz at a wavelength of 1.064  μm. The pulse energy is a few nanojoule. These 40-ps pulses are spectrally broadened in a standard single-mode fiber and then compressed in a 24-mm-long chirped Bragg grating to as low as 3.3 ps. The repetition rate can be tuned from 0.2 to 1.4 MHz by changing the pump power, while the pulse width and the pulse energy from the microchip laser are unchanged. The spectral broadening in the fiber is observed throughout the pulse repetition rate, supporting sub-10-ps pulses. Finally, the pulses are amplified in a single-stage Nd:YVO4 amplifier up to the microjoule level (up to 4  μJ pulse energy). As a result, the system delivers sub-10-ps pulses at a microjoule level with about 1 MHz repetition rate, and thus fulfills the requirements for ps-micromachining. It does not contain any active switching elements and can be integrated in a very compact setup.

Figures in this Article
© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Erdal Türkyilmaz ; Jan Lohbreier ; Christian Günther ; Eva Mehner ; Daniel Kopf, et al.
"Simple ps microchip Nd:YVO4 laser with 3.3-ps pulses at 0.2 to 1.4 MHz and single-stage amplification to the microjoule level", Opt. Eng. 55(6), 066126 (Jun 29, 2016). ; http://dx.doi.org/10.1117/1.OE.55.6.066126


Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.