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Passively Q-switching Yb:YAG (1030 nm) or Nd:YAG (1064 nm) lasers is best achieved using

Cr4+:YAG (Chromium-doped Yttrium Aluminum Garnet) crystals as saturable absorbers. These passive absorbers provide high peak power pulses in compact, cost-effective designs, with efficient performance (up to 44% optical efficiency).

Key Aspects of Passive Q-Switching for Yb/Nd:YAG

Saturable Absorber:
$cap C r raised to the 4 plus power$
:YAG is preferred for 0.8–1.2
$mu$
m laser diodes due to its high damage threshold (>10 J/cm² @ 1064 nm), chemical stability, and high thermal conductivity.
Performance: A passively Q-switched Yb:YAG laser can yield pulse widths of 5-9 ns with peak powers reaching kilowatts to over 91 kW.
Mechanism: It automatically triggers pulses when energy stored in the gain medium reaches a peak, eliminating the need for high-voltage electronics.
Configuration: Commonly used in microchip setups (e.g., Yb:YAG/Cr4+:YAG composite crystals) for compact laser systems.

Passively Q-switch for Yb:YAG or Nd:YAG laser
Cr4+:YAG (Y3Al5O12) crystal is ideal for passive Q-switch operation of Nd:YAG and other Nd3+ or Yb3+ doped laser crystals in the w...
HG Optronics.,INC.
Passively Q-switched microchip lasers based on Yb:YAG/Cr 4+
Feb 1, 2014 — Enhanced performance of Cr4+:YAG passively Q-switched Yb:YAG laser with diamond surface cooling has been demonstrated with optical...
ScienceDirect.com
Cr 4+ :YAG passive Q-switch - OptoCity
Cr4+:YAG is an excellent passive Q-switch crystal for 0.8 to 1.2 µm lasers such as Nd:YAG, Yb:YAG laser. Cr4+:YAG is chemically st...
OptoCity

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Passively Q-switch for Yb:YAG or Nd:YAG laser

hgoptronics.com

https://www.hgoptronics.com › passively-q-switch-for-...

hgoptronics.com

https://www.hgoptronics.com › passively-q-switch-for-...

Cr4+:YAG (Y3Al5O12) crystal is ideal for passive Q-switch operation of Nd:YAG and other Nd3+ or Yb3+ doped laser crystals in the wavelength range of 900 nm to ...Read more

Passively Q-switched dual-wavelength green laser with an ...

Optica Publishing Group

https://opg.optica.org › abstract

Optica Publishing Group

https://opg.optica.org › abstract

by P Ye2017Cited by 45 — In this paper, we firstly reported a dual-wavelength green pulsed laser that is passively Q-switched by a Yb:YAG/Cr⁴⁺:YAG/YAG composite crystal and intra-cavity ...Read more

Cr 4+ :YAG passive Q-switch

OptoCity

https://www.optocity.com › CrYAG

OptoCity

https://www.optocity.com › CrYAG

Cr⁴⁺:YAG is an excellent passive Q-switch crystal for 0.8 to 1.2 µm lasers such as Nd:YAG, Yb:YAG laser. Cr⁴⁺:YAG is chemically stable, durable, UV resistant, ...Read more

End-pumped, passively Q-switched Yb:YAG double-clad ...

National Institutes of Health (NIH) | (.gov)

https://pubmed.ncbi.nlm.nih.gov › ...

National Institutes of Health (NIH) | (.gov)

https://pubmed.ncbi.nlm.nih.gov › ...

by JI Mackenzie2002Cited by 55 — We present a diode-pumped, double-clad Yb:YAG waveguide laser that contains an integrated section of a Cr(4+): YAG saturable absorber for passive Q ...

Numerical modelling of passively cooled and Q-switched ...

SPIE Digital Library

https://www.spiedigitallibrary.org › 12.3042086.full

SPIE Digital Library

https://www.spiedigitallibrary.org › 12.3042086.full

by P Bourdon2025 — We present here the changes we made to the numerical model. We first added Nd:YAG passively Q-switched laser modelling capability as Nd:YAG is ...Read more

Multiple-beam output, high-peak power passively Q ...

ScienceDirect.com

https://www.sciencedirect.com › science › article › pii

ScienceDirect.com

https://www.sciencedirect.com › science › article › pii

by OV Grigore2024Cited by 5 — In this work we report on the characteristics of a passively Q-switched Nd:YAG/Cr⁴⁺:YAG laser with four beams, developed for studies on the laser ignition ...Read more

Passively Q-switched Yb:YAG ceramic laser with Cr 4+

researching.cn

https://www.researching.cn › ArticlePdf › 2012/10

researching.cn

https://www.researching.cn › ArticlePdf › 2012/10

PDF

by J Ma2012Cited by 1 — Highly efficient passively Q-switched Yb:YAG ceramic laser with Cr4+:YAG crystal as saturable absorber is achieved. Maximum average output power of 0.96 W ...Read more

High Peak Power, Passively Q-Switched Yb:YAG/Cr ...

IEEE

https://ieeexplore.ieee.org › document

IEEE

https://ieeexplore.ieee.org › document

by M Tsunekane2013Cited by 65 — To our knowledge, these are the highest pulse energy and peak power ever reported in Yb:YAG/Cr:YAG micro-lasers. The Yb:YAG rod with 5 at.% Yb ...Read more

Efficient Passively Q-Switched Nd:YAG/Cr4+:YAG/LBO ...

IOPscience

https://iopscience.iop.org › article

IOPscience

https://iopscience.iop.org › article

by SG Fu2015Cited by 1 — Performance of an LD-end-pumped passively Q-switched Nd:YAG/Cr⁴⁺:YAG microchip laser operating at 1123 nm is studied. A maximum average output power of 517 mW ...Read more

High-Power Passively Q-Switched Nd:YAG Laser at ...

Chin. Phys. Lett.

https://cpl.iphy.ac.cn › article