The torus is the only actively locked single longitudinal mode laser commercially available. The torus is available at 532nm (50mW to 750mW) and at 660nm (50mW to 200mW), making it ideal for applications such as holography, Brillouin scattering and high resolution Raman spectroscopy. The pump diode MTTF is manufacturer-specified as >40,000 hours at full power, but Laser Quantum de-rates the diode to further increase its lifetime, giving the torus itself industry leading lifetimes.

Despite the inherent single frequency operation of the torus, mode-drift and eventual mode-hop will occur if the laser cavity changes length due to ambient air temperature variation. To mitigate this, the digital power supply receives a signal from the laser which reports the exact position of the laser mode in frequency space. The power supply then feeds back a control signal which maintains the position of the mode. This active feedback control loop eliminates the risk of mode-hop and leads to a highly stable output.

• Raman Spectroscopy
• Holography
• Interferometry
• Brillouin Scattering

For the newest information, please see the website of Laser Quantum: torus.