10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free PTO questions are organized by exam domain, so you can see how each part of the Photonics Technician Operator blueprint is tested. Reveal the answer and explanation under each question.
An optical link launches +4 dBm into a fiber. The fiber contributes 3 dB of loss, and all connectors together contribute another 2 dB. There are no other gains or losses. The receiver's specified operating range is -8 dBm to -3 dBm. Which received-power result and operating assessment are correct?
Correct answer: A - -1 dBm; above the receiver's maximum input.
Reference-source checks produce power-meter readings of 9.41, 9.42, and 9.41 mW. The stabilized reference is 10.00 mW with an uncertainty of 0.01 mW, and the specified measurement conditions have been met. What do these results establish about the meter at this test point?
Correct answer: D - Its repeatability is good, but it has a negative measurement bias.
While checking a lens assembly at 633 nm, a technician moves a camera through the image of a point source. The spot becomes a narrow horizontal line at one position and a narrow vertical line farther along the axis. No camera position brings both orientations to the same sharp focus. Which aberration best fits this focus sweep?
Correct answer: C - Astigmatism
To image a backlit reticle, a technician places it 90 mm in front of a converging thin lens with a focal length of 60 mm. The camera sensor must capture a real, focused image on the outgoing side. Assume an ideal lens in air. Where should the sensor be placed, and what image will it record?
Correct answer: A - 180 mm beyond the lens; inverted and twice as large.
A working laser has a 95%-reflecting output coupler. An otherwise equivalent coupler with 70% reflectivity is installed, and laser oscillation stops although the gain medium still fluoresces. Pump power, cavity geometry, alignment, and temperature are unchanged. What most directly explains the loss of oscillation?
Correct answer: B - Round-trip loss now exceeds the gain available at this pump setting.
For a 248 nm ultraviolet processing station, the replacement source must match the original excimer laser's emission wavelength. Which active gas species should appear in the replacement specification?
Correct answer: C - Krypton fluoride (KrF)
Before an authorized alignment of a frequency-doubled Nd:YAG system, the laser safety officer specifies minimum eyewear optical densities of OD 4 at 532 nm and OD 5 at 1064 nm because both wavelengths can be accessible. All four models meet the task's other fit, visibility, and damage-resistance requirements. Which set of documented ratings meets the wavelength-specific requirement?
Correct answer: B - OD 5 at 532 nm; OD 6 at 1064 nm.
At shift start, an operator checks an enclosed marker labeled Class 1 for normal operation. Its internal laser is Class 4. The housing is intact, interlocks pass their required checks, and the approved normal-use procedure requires no laser eyewear. No enclosure will be opened. Which operating decision is justified?
Correct answer: A - Operate normally with the housing closed and the specified controls in place.
The output of a continuous-wave laser is stable on an independent power meter, but a beam camera reports increasing beam width as exposure time is increased. The central pixels form a plateau at the camera's maximum digital value. Before changing the laser alignment, the technician should:
Correct answer: D - Shorten the exposure and remeasure the unsaturated beam profile.
Two fixed irises mark the required optical axis of a beam-delivery system. During an approved low-power alignment, a collimated beam is centered at the near iris but above the center of the far iris. The beam is safely terminated beyond them. How should this alignment be characterized?
Correct answer: D - The near-plane position is correct, but the beam direction is not.
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