Phocus Benchtop

Based on ‘ring-cavity’ optical parametric oscillator (OPO) technology, the PhocusTM Series represents the optimal light source for photoacoustic imaging applications that require high pulse energies and NIR wavelengths for deep penetration of biological tissue. High damage thresholds combined with minimal maintenance and turn-key operation reduce system down-time and allow ease of operation. A customizable, safety-interlocked fiber bundle delivers light from the system to the instrumentation and prevents system operation without fiber attachment. Motorized tuning, motorized harmonics and fiber bundle delivery provide a completely, hands-free tunable laser system.

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Wavelength Range [nm]:

690 – 950

Peak OPO Energy [mJ]:

55 (130)

Spectral Linewidth [cm-1]:

30 – 80

Beam Divergence [mrad]:

Fiber Bundle Delivery

Linear Polarization:


UV Tuning [nm]:


Residual Pump Energy [mJ]:


Dimensions [in (mm)]:

27.5 (699) x 16.5 (419) x 11.0 (279)

Pump Wavelength [nm]:


Repetition Rate [Hz]:

10 or 20

Pulse Length [ns]:


Beam Diameter [mm]:


Trigger Connections:


PSU Dimensions [in(mm)]:

20.0 (508) x 11.1 (282) x 20.0 (508)

PSU Cooling:

Closed-loop air-water cooled

Build Your Product
Option 1 Group

Energy Level

The Phocus can be configured for two energy levels, as presented in the tuning graphs. Select the desired configuration based on the graph. The outside dimensions are identical.

Option 2 Group

Access to pump laser wavelengths

Optional access to the full power of the pump laser fundamental (1064 nm) and the second harmonic (532 nm) is available. Mounted optics that can be installed by the user (no alignment required), which reflect the desired beams through added ports are provided. The 1064nm beam exits from the front whereas the 532 nm beam exit through a port on the side of the system. Access to the residual 1064nm is also available (532 nm residual already included). In this configuration the beam exits from a port on the side and can be used simultaneously with the OPO.

Option 3 Group

Fiber Bundle

The desired method for coupling the tunable laser light to the photoacoustic target is through a fiber bundle. This allows for flexible system architecture, separating the laser source from the biological sample. Approximately 70% of the tunable laser light transmits through the fiber bundle. The standard Fiber Bundle option includes a 2 m long, 5 mm input/output diameter optical bundle with 0.37 NA, focusing/imaging optics and their mounts. Inquire about customizable fiber bundles with different geometries and multiple output arms.

Option 4 Group

Fast Tuning

This option (patent pending) enables fast switching of the output wavelength such that each consecutive pulse can be set to any wavelength within the wavelength range of the system. The user can enter a sequence of wavelengths into the control software, with any step size (zero to full range) in any order, and the system will generate these wavelengths pulse after pulse. It can be set to stop after a single sequence or to repeat the sequence as defined by the end-user.

Option 5 Group

Access to Idler

Extend the tunable range of the Phocus system further into the near-infrared with access to the Idler. All tunable beams exit the system from the same port. Option includes automated range selection for seamlessly switching between Signal and Idler and continuous scan over the entire tunable range.

Option 6 Group

Motorized Variable Attenuator

Vary the OPO pulse energy by choosing the Motorized Variable Attenuator (MVA) option. By default the end-user changes the OPO pulse energy by changing the pump laser pulse energy through software command. However, OPO pulse-pulse energy instability increases at lower pump laser energy levels. The MVA option involves maintaining the pump laser pulse energy at maximum and using optical attenuation to change the OPO pulse energy without compromising energy stability. The MVA option connects through the electronics unit for computer control. Placement of the attenuator results in about 10% optical loss. If needed the MVA can also be removed for full energy access and reinstalled without need for alignment.

Option 7 Group

Real-time Wavelength Monitoring and Auto Harmonic Optimization

The option includes a built-in wavemeter combined with motorized harmonics. The wavemeter provides real time measurement of the OPO wavelength, which is displayed in the control software screen. The option allows closed-loop tuning of the OPO , which provides better than 1 nm accuracy of the Signal wavelength. In addition, the wavemeter signal serves as a feed-back reference, which can be used to optimize the phase-matching of the harmonics.  Complete automation of phase matching simplifies the procedure to a single click through the Harmonics Auto-optimization software command (included).

Option 8 Group

Real-time Energy Monitoring

The output energy of the OPO can be measured and displayed on the control software screen in real time. The measured pulse-pulse energy is digitized and available for data normalization, therefore significantly reducing the effects of pulse to pulse OPO variations on image creation. In place of the Wavemeter kit, the option can include motorized harmonics that replaces the default manual control mechanism for harmonic phase matching optimization. Combined with the Powermeter signal as a feedback mechanism, complete automation of phase matching simplifies the procedure to a single button click through the Harmonics Auto-optimization software command.

Option 9 Group

Software Development Kit

Software Development Kit (SDK) that allows end-users to integrate system control functions into third-party software can be downloaded for no charge. The SDK works under most Windows-based programming environments and provided with limited technical support.

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